Lidé

Ing. Tomáš Martan, Ph.D.

Všechny publikace

Local detection of gaseous carbon dioxide using optical fibers and fiber tapers of single-cell dimensions

  • DOI: 10.1016/j.snb.2022.132887
  • Odkaz: https://doi.org/10.1016/j.snb.2022.132887
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The CO2 amount in the air and its monitoring is widely recognized as an important issue at this time. We are facing excessive CO2 production and global warming affecting not only the environment but also life at the lowest level. A variety of strategies have been designed to reduce atmospheric CO2, but one promising method is based on the application of biologically engineered microorganisms to actively consume a high volume of CO2. The paper presents the design, development, and characterization of two types of sensors for the local detection of gaseous carbon dioxide on microscopic scale. The first one was designed as a fiber optic CO2 measuring cell and the second was based on a CO2 sensitive fiber taper tip. The sensors were based on the absorption of guided visible light in a sensitive polymer layer. The sensors were characterized in the range of 0%-10.6% of carbon dioxide concentration with full linearity. A sensitivity of 0.25 +/- 0.05 dB/% and a limit of detection of 7.1.10(-3)% have been determined for the sensing element. We have experimentally verified the operational reversibility of the CO2 sensing element over time. The time response of the sensor with the finally used sensitive layer of thickness of 600 nm was one second. Both sensors were designed for future application in biological research. Especially the second type of the sensor based on 3 mu m silica glass taper tip (diameter corresponding to single-cell proportions) is suitable for laboratory testing of microorganisms and cells that actively consume gaseous carbon dioxide.

Hybrid polymer-glass planar Bragg grating as a temperature and humidity sensor

  • DOI: 10.1007/s11082-022-04003-0
  • Odkaz: https://doi.org/10.1007/s11082-022-04003-0
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper presents the design and construction of a new planar optical Polymer Waveguide Bragg grating (PWBG) temperature and humidity sensor realized by polymer-glass hybrid technology composition with a new layout concept. The Bragg grating of a sensor was made by a Direct Laser Writing (DLW) in Poly (methyl methacrylate) (PMMA) formed on a multimode waveguide realized in a glass substrate by Ag+ <-> Na+ ion exchange. The fabricated hybrid Bragg grating structure exhibited more than 10 dB of the attenuation dip, equivalent to higher than 90% diffraction efficiency. The fabricated hybrid PWBG sensor exhibited high temperature and humidity sensitivity in contrast to glass-based sensors of - 48.6 pm/degrees C and 54.16 pm center dot RH-1, respectively.

Properties of Photovoltaic Power Converters for Power over Fiber Applications

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    We report on the optical properties of the Si vertical multi-junction cell photovoltaic converters optimized for 980 nm wavelengths for power over fiber applications. The converters were coupled with the 105 μm multimode fiber and the optical efficiency were measured for optical power from 250 mW to 4 W.

Structurally-modified tapered optical fiber sensors for long-term detection of liquids

  • DOI: 10.1016/j.yofte.2018.11.010
  • Odkaz: https://doi.org/10.1016/j.yofte.2018.11.010
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    We present an improvement of tapered optical fiber (TOF) sensor’s response for the detection of liquids, which is achieved by TOF surface structural modification. Our TOF sensors utilize the refractometric principle with enhanced evanescent-wave overlap due to the wavelength of 1550 nm and TOF waist diameters of 4–6 μm. The structural modification is achieved by long-term TOF exposition to hygroscopic liquid analytes and ambient atmosphere. To analyze the structural modification process, long-term as well as proof-of-principle tests have been carried out to evaluate TOF sensors stability in terms of sensitivity and resolution. Maximum sensitivity of over 2100 dB/RIU has been reached when TOF is used to detect a liquid analyte with refractive index of 1.415. Increase of more than 1400 dB/RIU is attributed to the enhanced sensitivity. Sample TOF sensors were then linearly calibrated and have been tested in more than one year-long continuous measurement campaign. Resolution better than 7x10^-4 for a refractive index range of from 1.405 to 1.425 with working point drift below 2x10^-4 over 12 months period has been achieved. Our results and observations are suitable for reliable, low-cost and application-tailored TOF sensor development.

Experimentally and analytically derived generalized model for the detection of liquids with suspended-core optical fibers

  • DOI: 10.1016/j.yofte.2018.08.005
  • Odkaz: https://doi.org/10.1016/j.yofte.2018.08.005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    A generalized model for the detection of liquids within suspended-core microstructured optical fibers has been experimentally and theoretically derived. The sensor detection is based on the refractometric principle of transmission losses due to the overlap of the evanescent field with the liquid analyte. A number of parameters, including fiber core diameter and filling length, have been included in the general model. Specially tailored suspended-core fibers were manufactured with the core diameters within the range of 2.4 um to 4.0 um. Five selected liquid analytes were used to cover the refractive index range of 1.35 to 1.42. Based on experiments, the characteristics of the parameters of the semi-empirical model have been determined by a genetic algorithm using 283 measurement data sets. The model can be used to design sensors for the detection of liquid analytes as it provides a set of parameters allowing to optimize the sensor’s sensitivity for a wide scale of applications. Finally, numerical simulations of the system were carried out by an eigenmode routine to support the results of the generalized model.

Refractometric Detection of Liquids Using Tapered Optical Fiber and Suspended Core Microstructured Fiber: A Comparison of Methods

  • DOI: 10.1364/AO.56.002388
  • Odkaz: https://doi.org/10.1364/AO.56.002388
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Detecting explosive, flammable or toxic industrial liquids reliably and accurately is a matter of civic responsibility which cannot be treated lightly. Tapered optical fibers (TOFs) and suspended core microstructured optical fibers (SC MOFs) were separately used as sensors of liquids without being compared to each other. We present a highly-sensitive time-stable TOF sensor incorporated in the pipeline system for in-line regime of measurement. The paper is furthermore focused on the comparison of this TOF and SC MOF of similar parameters for detection of selected liquids. A validated method that incorporates TOF and SC MOF of small core (waist) diameter for refractometric detection is presented. The principle of detection is based on the overlap of an enhanced evanescent wave with a liquid analyte which either fills the cladding holes of the SC MOF, or surrounds the waist area of the TOF. Optical power within the evanescent wave for both sensing structures and selected liquid analytes is analyzed. Measurement results concerning TOF and SC MOF are compared. Calculations to ascertain the limit of detection (LOD) for each sensor and the sensitivity (S) to refractive indices of liquid analytes in the range of 1.4269 to 1.4361 were performed at a wavelength of 1550 nm with the lowest refractive index step of 0.0007. Results affirming that S = 600.96 dB/RIU and LOD = 0.0733 RIU for the SC MOF and S = 1143.2 dB/RIU and LOD of 0.0026 RIU for the TOF sensor were achieved, clearly illustrating that TOF based sensors can reach close to two times greater sensitivity and 30-times higher limit of detection. The paper extends the comparison of the fiber sensors by discussing the potential applications.

Optical Switching Based on Arsenic-Selenide and Lead-Silicate Fibers

  • Autoři: doc. Ing. Matěj Komanec, Ph.D., Němeček, T., Suslov, D., Ahmad, R., Ing. Tomáš Martan, Ph.D.,
  • Publikace: 10th International Symposium on Communication Systems, Networks and Digital Signal Processing - Proceeding. Piscataway: IEEE, 2016. ISBN 978-1-5090-2526-8.
  • Rok: 2016
  • DOI: 10.1109/CSNDSP.2016.7573953
  • Odkaz: https://doi.org/10.1109/CSNDSP.2016.7573953
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    The paper reports our progress on soft-glass fibers for optical switching purposes based on four-wave mixing. Specific development of connectorized nonlinear modules for switching application is presented. For the arsenic-selenide fiber we present a novel solid joint technology, with connection losses of only 0.25 dB, which is the lowest value presented up-to-date. We have carried out conversion efficiency simulations, conversion efficiency of -16.1 dB was obtained with arsenic-selenide fiber of length reduced to 5 m. Finally experimental tests are included employing our developed optical switch testbed. Measurement results with a 26 m and a 4.5 m long arsenic-selenide nonlinear modules are presented.

Preparation and Testing of Fiber Tapers for Repeatable Detection of Selected Hydrocarbons

  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Tapered optical fibers were prepared by heating of a section of the single-mode optical fiber using the tapering apparatus equipped by hydrogen-oxygen flame. Prepared samples of taper waist diameter of 6.1 μm and 3.4 μm were characterized and used as sensors working on refractometric principle of detection at a wavelength of 1550 nm. The repeatability of sensitivity measurement for selected liquids (hydrocarbons) was successfully tested with maximum of deviation of 0.1 dB from the mean value. The samples returned to baseline after purifying very well. Maximum of deviation of 0.05 dB from the mean value was calculated from measured data. OCIS codes: 280.0280

Suspended-core silica and lead-silicate fibers for nonlinear application and sensing purposes

  • DOI: 10.1117/12.2227105
  • Odkaz: https://doi.org/10.1117/12.2227105
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    We report development of suspended-core silica and lead-silicate microstructured optical fibers for detection of liquids and supercontinuum generation. Theoretical analysis of effective mode area, dispersion curve, nonlinear coefficient and mode-field overlap is presented. For a specific lead-silicate fiber we determinated the zero dispersion wavelength at 1113 nm with a nonlinear coefficient of 1321 W-1km-1. For detection of liquids both silica and lead-silicate fibers are found to be suitable in different refractive index ranges 1.38-1.44 and 1.68-1.74 respectively. Coupling efficiency into all studied fibers over 40%; fiber attenuation was measured by the cut-back technique and is approximately 2 dB/m for silica glass fibers and over 3 dB/m for lead-silicate fibers.

Multimode fiber tapers for reproducible refractometric liquid detection

  • DOI: 10.1117/1.OE.54.4.047102
  • Odkaz: https://doi.org/10.1117/1.OE.54.4.047102
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper describes the refractometric detection of liquids based on silica multimode optical fibers which were tapered to increase the evanescent-wave overlap for higher sensor sensitivity. By precisely monitoring the production process, consistent sample parameters were achieved. More than 200 tapers with a taper waist diameter range from 6.0 to 76.3 μm were prepared from polymer-clad silica and gradient-index multimode fibers. U-shaped fiber taper sensitivities were analytically compared with straight tapers with resulting intensity sensitivities of over 200%/RIU. Crucial parameters for real sensor applications, such as measurement repeatability, reproducibility, and long-term stability, were further studied for polymer-clad silica straight tapers. Longterm stability was monitored showing stable measurement results over a 6 months long interval. Measurement repeatability and reproducibility with standard deviations of 0.55%/RIU and 2.26%/RIU, respectively, were achieved.

Soft-glass Fiber Modules for NIR/MIR High-power Lasers, Supercontinuum Sources and Sensing Applications

  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper presents results from the development of soft-glass fiber modules for near- and mid-infrared applications. They can be utilized especially in applications such as high-power lasers, supercontinuum generation and spectroscopy. The technology of fiber processing, preparation and connectorization has been mastered in cooperation with SQS Fiber optics in the frame of joint cooperation in several co-running projects; the high-power lasers and supercontinuum generation is prepared with the IPE Academy of Sciences of the Czech Republic. We have studied soft-glass fibers including chalcogenide arsenic-selenide, lead-silicate and zirconium-fluoride glass materials. Crucial optical signal factors for specific purposes such as operational wavelength, insertion-loss on the soft-glass-silica-glass boundaries, back-reflected optical power reduction to prevent lasing, power-induced heat generation issues and mode-field mismatch must be taken into account. Technological aspects then include bending radii, glass fragilities and glass toxicities. Results from laboratory measurements will be shown to verify the theoretical dispersion calculation. Results from technological tests of chalcogenide arsenic-selenide fiber module, lead-silicate microstructured fiber free-space optic coupling and zirconium-flouride glass processing challenges will be as well presented more in detail.

Suspended-core microstructured fiber for 2 refractometric detection of liquids

  • DOI: 10.1364/AO.54.008899
  • Odkaz: https://doi.org/10.1364/AO.54.008899
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    A silica suspended-core microstructured optical fiber sensor for detection of liquids, operating at 1550 nm, is analyzed. The sensing principle is based on the evanescent wave overlap into a tested analyte, which is filled via capillary forces into the cladding holes. Validations for analytes in the refractive index range of 1.35–1.43 are carried out with liquid-analyte-filling-length limits being studied both theoretically and experimentally. We prove, for the first time to our knowledge, that an extreme sensitivity of 342.86 dB/RIU and resolution of 4.4 × 10−5 can be achieved. This sensor represents a high-quality alternative for applications requiring a facile, low-cost solution.

Data Transparent and Polarization Insensitive All-Optical Switch based on Fibers with Enhanced Nonlinearity

  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    We have developed a data transparent optical packet switch, working at optical powers conventional in telecommunications. Polarization sensitivity of only 0.6 dB was achieved. The optical packet switch exploited wavelength conversion based on four-wave mixing. To achieve higher switching efficiencies, Ge-doped silica suspended-core and chalcogenide arsenic-selenide singlemode fibers were employed and compared to conventional highly-nonlinear fibers. Improved connectorization technology has been developed for both fibers to reduce overall component insertion loss, where we achieved connection losses of 0.9 dB. For the arsenic-selenide fiber we present the lowest attenuation up-to-date of 0.58 dB/m. Pump power limits for optical packet switching were set to 23 dBm, as limited by most thin-film components. Conversion efficiency of -16 dB was obtained for the highly-nonlinear fiber utilizing pump peak powers of 16 dBm. Arsenic-selenide fiber of 26 m length was evaluated, providing conversion efficiency lower than -38 dB with component insertion loss of -16.5 dB, thus further optimization was carried out according to simulated results. Conversion efficiency of -20 dB was observed with arsenic-selenide fiber length reduced to one meter.

Polymer-Clad Silica Tapers for Liquid Sensing: Long-term Measurement Repeatability and Production Imperfections

  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Polymer-clad silica fiber tapers for refractometric detection of liquids are presented. Experimental study of sensor stability and measurement reproducibility is carried out, providing stable sensitivities with respect to production imperfections.

Tapered Optical Fibers for Reproducible Detection of Liquids

  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Fiber taper refractometric sensors for detection of liquids are presented. Almost one hundred tapers of a wide waist diameter range were reproducibly prepared from multimode and polymer-clad silica fibers. Sensitivity above 400%/RIU was achieved.

Split-Step Fourier Method for Simulation of Optical Pulses Propagation in Highly Nonlinear Optical Fibers

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Modeling of Fields - Doctoral grant of the Grant Agency of the Czech Republic 102/03/H086 "New Approach and Coordination of Doctoral Education in Radio-Electronics and Related Disciplines". Praha: IEEE Czechoslovakia Section, 2006. p. 148-153. ISBN 80-86582-19-1.
  • Rok: 2006
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Split-Step Fourier method is a pseudospectral numerical method suitable for solving the nonlinear Schrödinger equation. The method formally divides the Schrödinger equation into two parts, linear and nonlinear. Either part is applied separately (step by step) with using a fast Fourier transform to solving the Schrödinger equation for a nonlinear optical fiber section.

Apparatus for Tapering Optical Fibers

  • Autoři: Ing. Tomáš Martan, Ph.D., Novotný, K., Honzátko, P., Kaňka, J.
  • Publikace: Applied Electronics 2005 - International Conference Pilsen. Plzeň: Západočeská universita, 2005. pp. 402-403. ISBN 80-7043-369-8.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Tapered optical fibers are used in a vide variety of fiber optics applications, e.g. in nonlinear optics for supercontinuum generation, and for various types of fiber evanescence chemical sensors. The fiber taper is made by heating and stretching a single-mode optical fiber in a heat source. For fabrication of the fiber tapers we have designed and assembled the apparatus that is propelled with motors and controlled by a computer and other electronic equipments. In this paper it will be discussed the design and realization of the device for manufacturing fiber tapers. The device can be used for producing fiber tapers not only by stretching conventional single-mode optical fibers, but it can also be used for tapering microstructure optical fibers.

LC Network for Generation of Solitons

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Proceedings of Workshop 2005 - Part A,B. Praha: České vysoké učení technické v Praze, 2005. pp. 402-403. ISBN 80-01-03201-9.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper deals with properties and behavior of solitons propagating in the nonlinear LC network in comparison to known properties solitons generated in single-mode optical fibers or special optical fibers (mictostructure optical fibers or fiber tapers). For theoretical observation of Korteweg - de Vreis solitons behavior in LC network has been created computer simulation in computational system Maple. The properties of solitons simulated on the theoretical model were compared with measurement of voltage Korteweg-de Vreis solitons generated in newly constructed LC network. During measurements was observed and compared properties of solitons which were generated from different input voltage profiles.

Measurement of Radiation Patterns of Optical Applicators in the Air and Water Phantom

  • Autoři: Ing. Tomáš Martan, Ph.D., Herza, J.
  • Publikace: The 13th Conference on Microwave Techniques - COMITE 2005. Praha: IEEE Czechoslovakia Section, 2005. pp. 231-234. ISBN 80-86582-16-7.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper is focused on the optical applicator radiation pattern measurement in the different media, such as in the air and in the loss water phantom. We performed this measurement to evaluate optical applicators which could be used for medical purposes.

Modelování šíření optických pulsů nelineárním disperzním prostředím Fourierovou metodou dělených kroků

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Modelování polí - Práce doktorského grantu GAČR 102/03/H086 "Nové pojetí a koordinace výuky doktorandů v radioelektronice a souvisejících oborech". Praha: IEEE Czechoslovakia Section, 2005. p. 184-194. ISBN 80-86582-18-3.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Fourierova metoda dělených kroků je pseudo-spectralní numerická metoda vhodná pro modelování šíření úzkých optických pulsů nelineárním dispersním prostředím. Tato metoda může být použita pro modelování ultraúzkých (femtosekundových) optických pulsů s vysokým špičkovým výkonem, které se šíří disperzním a nelineárním prostředím optického vlákna. Fourierova metoda dělených kroků je založena na formálním rozdělení perturbované nelineární Schrödingerovy rovnice popisující šíření úzkých optických pulsů na dvě části, které jsou popsány lineárním a nelineárním operátorem. Nelineární Schrödingerova rovnice je potom řešena odděleně pro každý operátor zvlášť na úseku vlákna o infinitezimální délce. Znamená to tedy, že pro teoreticky nekonečně krátký úsek optického vlákna je v jednom výpočetním kroku uvažována jen disperze vlákna a v druhém kroku jen indukovaná nelinearita. Tento způsob výpočtu je pak aplikován na celé optické vlákno konečné délky.

Optical Applicators Radiation Pattern Measurement

  • Autoři: Herza, J., Ing. Tomáš Martan, Ph.D.,
  • Publikace: 9th International Student Conference on Electrical Engineering. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2005. p. C5.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper is focused on the system for optical applicator evaluation, that means measurement of the farfield radiation pattern nearby the aperture of the optical applicator. The measurement was realized with the fiber applicators, which were designed for photodynamic treatment of primary lesion. This project is also focused on the design and testing of different shapes of the optical applicator. Different terminations of optical applicators were modified for obtaining the optimal radiation patterns. The radiation pattern represents the dependence of radiated power on the angle shift of the fiber termination.

System for Evaluation of Microwave Applicators

  • Autoři: Herza, J., Ing. Tomáš Martan, Ph.D.,
  • Publikace: Proceedings of Workshop 2005 - Part A,B. Praha: České vysoké učení technické v Praze, 2005. pp. 804-805. ISBN 80-01-03201-9.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper is focused on the evaluation of optiical applicators for photodynamic treatment method. For this purpose the device for radiation pattern measurement has been used.

Visualization of Leaky Waves on Planar Transmission Lines

  • Autoři: Ing. Tomáš Martan, Ph.D., Zehentner, J., Mrkvica, J.
  • Publikace: Odborné semináře - Sborník za rok 2004/2005. Praha: Československá sekce IEEE, 2005. p. 3-7. ISBN 80-86582-17-5.
  • Rok: 2005
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This peper presents a visulaization of leaky waves excieted by delta-gap sources on planar transmission lines, namely the 2nd surface and space leaky modes on the slotline, and the dominant and surface leaky modes on the conductor-backed slotline. The field is modeled by numerical calculation in the time domain. The simulations show the character of the leaky waves excited by delta-gap sources and are a useful tool for the investigation of leaky waves.

Historie solitonových vln a jejich využití v optické komunikační technice

  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Článek pojednává o solitonových vlnách z historicko-technického hlediska. V textu se autor nejprve zabývá vymezením pojmu solitonová vlna a popisuje původ vzniku slova soliton. Dále se zabývá prvním historicky zdokumentovaným pozorováním solitonové vlny a historickými událostmi, kterými byl tento objev provázen. V článku je historie solitonů popsána až po současnost, kdy je možno solitonové vlny využívat zejména v optické komunikační technice pro rychlý přenos informace na velké vzdálenosti.

Investigation Into History of Solitons

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: POSTER 2004. Praha: ČVUT v Praze, FEL, 2004. p. HS182. ISBN 0-8194-5950-X.
  • Rok: 2004
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper deals with another investigations into the history of solitons. The paper is focused on situation in the first observation of soliton and on happening in the second half on the 19th century in detail.

Konstrukce tažičky pro speciální optická vlákna

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Odborné semináře - Sborník za rok 2003/2004. Praha: Československá sekce IEEE, 2004. pp. 48-51. ISBN 80-86582-14-0.
  • Rok: 2004

Measurement of Far-Field Radiation Patterns of Applicators for Photodynamic Treatment

  • Autoři: Ing. Tomáš Martan, Ph.D., Herza, J., Kunstát, P.
  • Publikace: POSTER 2004. Praha: ČVUT v Praze, FEL, 2004. p. EI224. ISBN 0-8194-5950-X.
  • Rok: 2004
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper deals with a measurement of far-field radiation patterns of optical applicators for photodynamic therapy. The measurement was realized with the fiber applicators, which were manufactured for photodynamic treatment of primary lesion. This project was focused on testing different shape applicators for effective distribution of optical energy to different shapes of tumors. Different terminations of optical applicators were measured for obtaining of radiation patterns. The radiation pattern represents dependence of radiated power on an angle shift of the fiber termination. The measurements were realized in cooperation with doctors of the Radiation Oncology

Měření chromatické disperze a dvojlomu mikrostrukturních optických vláken

  • Autoři: Peterka, P., Dymák, P., Honzátko, P., Matějec, V., Kaňka, J., Ing. Tomáš Martan, Ph.D., Vraný, B., Káčik, D., Pardem, W., Lyytikainen, K.
  • Publikace: Optické komunikace 2004. Praha: Agentura Action, 2004. p. 137-143. ISBN 80-86742-06-7.
  • Rok: 2004
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    V příspěvku je na několika příkladech popsána charakterizace chromatické disperze MOF (mikrostrukturních optických vláken - Microstructure Optical Fibres) interferometrickou metodou a jsou uvedeny odlišnosti od měření disperze standardních optických vláken.

Návrh a testování optických aplikátorů

  • Autoři: Herza, J., Ing. Tomáš Martan, Ph.D., Kunstát, P.
  • Publikace: Sborník příspěvků konference RADEŠÍN 2004. Brno: FEKT VUT v Brně, 2004. pp. 48-49. ISBN 80-214-2726-4.
  • Rok: 2004

Nelineární článkové vedení pro demonstraci mřížkových solitonů

  • Autoři: Ing. Tomáš Martan, Ph.D., Novotný, K.
  • Publikace: Sborník vzdělávacích a vědeckovýzkumných činností a nabídek. Praha: IEEE Czechoslovakia Section, 2004. p. 21. ISBN 80-86582-15-9.
  • Rok: 2004
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Tento článek se zabývá konstrukcí nelineárního LC vedení a měřením nelineárních napěťových KdV solitonů na tomto LC vedení. Soliton je stabilní nelineární pulzní obálka šířící se beze změny tvaru LC vedením. Napěťové solitony jsou obdobou optických solitonů šířících se v optických vláknech. Nelineární LC vedení bylo zkonstruováno pro generování solitonů a pro pozorování jevů, které vznikají během šíření solitonů.

Optical Applicators for Photodynamic Treatment

  • Autoři: Herza, J., Ing. Tomáš Martan, Ph.D., Cvek, J., Chovanec, R., Kunstát, P.
  • Publikace: Conference Proceedings of Radioelektronika 2004. Bratislava: Slovak University of Technology, 2004. pp. 510-512. ISBN 80-227-2017-8.
  • Rok: 2004
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper is focused on the design, construction and testing of the optical applicators for photodynamic therapy. This equipment is used as a treatment and diagnostic method in oncology.

Tažička pro speciální optická vlákna

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Sborník příspěvků konference RADEŠÍN 2004. Brno: FEKT VUT v Brně, 2004. pp. 86-87. ISBN 80-214-2726-4.
  • Rok: 2004

Discovery of Water Solitary Waveand Historical Development

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Poster 2003. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2003. p. M9. ISSN 0277-786X. ISBN 0-8194-5368-4.
  • Rok: 2003
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    The paper is devoted to the first historically documented observation of water solitary wave, than to facts about investigations of the phenomenon and finally to facts about seeking any suitable mathematical description of this phenomenon realized in the second half of the 19th century. After the World war two the solitary waves were again observed in context with other different physical phenomena. The history of investigations and importance of solitons was described until the present time.

Measurement of Nonlinear Interaction of Voltage KdV Solitons

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Poster 2003. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2003. p. EI21. ISSN 0277-786X. ISBN 0-8194-5368-4.
  • Rok: 2003
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper deals with measurement of nonlinear interaction of voltage KdV solitons on nonlinear 100-units LC network. Soliton is stable nonlinear pulse envelope propagating without change of shape. Voltage solitons are analogy of the optical solitons. Nonlinear LC network was constructed for generation of solitons and for observation of phenomena which nascent during solitons propagation.

Microstructure Optical Fibers

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Odborné semináře - Sborník za rok 2002/2003. Praha: ČVUT FEL, Katedra elektromagnetického pole, 2003. p. 51-54. ISBN 80-86582-12-4.
  • Rok: 2003
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    This paper deals with microstructure optical fibers (MOFs). MOF is silica fiber with periodic system of axial air holes in the cladding region constructed as fiber realization of 2-D photonic crystals. Unique properties of MOFs are based on photonic bandgap (hollow-core fibers) or large index refractive contrast that exists between silica glass - air and inner design of the fiber (solid-core fibers). Endlessly single-mode MOF, polarization maintaining MOF, highly nonlinear MOF and multicore MOF are made at present.

Nelineární článkové vedení pro demonstraci mřížkových solitonů

  • Autoři: Ing. Tomáš Martan, Ph.D., Novotný, K.
  • Publikace: Sborník vzdělávacích a vědeckovýzkumných činností a nabídek katedry elektromagnetického pole FEL ČVUT. Praha: Československá sekce IEEE, 2003. p. 31. ISBN 80-86582-13-2.
  • Rok: 2003
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Předmětem realizace bylo zhotovení nelineárního 100 článkového LC vedení pro vybuzení a pozorování napěťových solitonových pulsů, které jsou analogií optických světelných solitonů. Realizované vedení sestává z kaskády čtyřsvorkových nelineárních LC sekcí, které obsahují induktory s konstantní indukčností a napěťově závislé kapacitory - varikapy. Toto 100 článkové LC vedení umožňuje generovat solitonové pulsy, které se vytvářejí transformací periodického průběhu vstupního napětí.

Nelineární jevy v optických vláknech

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: Radešín 2003 - Sborník příspěvků. Brno: VUT v Brně, FEI, 2003. pp. 16-17. ISBN 80-214-2479-6.
  • Rok: 2003
  • Pracoviště: Katedra elektromagnetického pole
  • Anotace:
    Příspěvek pojednává o šíření solitonů v optických vláknech a na nelineárním LC vedení. Na tomto vedení se podařilo generovat KdV solitony a měřit jejich vzájemné interakce. V příspěvku se autor dále zabývá problematikou mikrostrukturních optických vláken, zejména pak vysoce nelineárními mikrostrukturními optickými vlákny a generací superkontinua bílého světla v tomto vláknu a v tzv. vláknovém taperu.

Fotonická krystalická vlákna

  • Autoři: Ing. Tomáš Martan, Ph.D.,
  • Publikace: WORKSHOP - Grantové fórum. Praha: ČVUT FEL, Katedra elektromagnetického pole, 2002. p. 96-98. ISBN 80-86582-06-X.
  • Rok: 2002

Nelineární článkové vedení pro demonstraci mřížkových solitonů

  • Autoři: Ing. Tomáš Martan, Ph.D., Novotný, K.
  • Publikace: WORKSHOP - Vzdělávací fórum - nabídka aktivit. Praha: ČVUT FEL, Katedra elektromagnetického pole, 2002. p. 63-64. ISBN 80-86582-07-8.
  • Rok: 2002

Za stránku zodpovídá: Ing. Mgr. Radovan Suk