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Papers by Stepan Gorgutsa

Research paper thumbnail of Novel Wearable RF Textile-Integrated Antennas Made from Multi-Material Fibers

Workshop on Specialty Optical Fibers and Their Applications, 2015

Research paper thumbnail of THz metamaterials using aligned metallic or semiconductor nanowires

35th International Conference on Infrared, Millimeter, and Terahertz Waves, 2010

We study the transmission of THz radiation through the metamaterial films containing metallic or ... more We study the transmission of THz radiation through the metamaterial films containing metallic or semiconductor nanowires. The nanowire arrays are made by the stack-and-draw fiber fabrication technique. Metal embedded films exhibit strong polarizing properties, in contrast with those containing semiconductor.

Research paper thumbnail of Spectral “soliton” transformation and four-wave mixing under femtosecond laser radiation filamentation in molecular gases

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009

Filaments created during propagation of an ultrashort laser pulses in gases and solids combine hi... more Filaments created during propagation of an ultrashort laser pulses in gases and solids combine high non-linearity with huge intensity and long interaction path. Four-wave mixing, coherent Raman scattering, third harmonic production and others non-linear processes were observed . These studies were made with focused laser beams, when interaction length depends on the Rayleigh length. In this paper we report on thorough investigation of new spectral components formation under filamentation of pre-collimated laser beam in molecular gases. These components arose at the red and blue sides of the initial spectrum and were attributed to the generation of vibrational Raman "spectral solitons" and their cascaded four-wave mixing.

Research paper thumbnail of Generation of optical pulses of duration down to 8 fs upon filamentation of collimated femtosecond laser radiation in argon

Quantum Electronics, 2009

ABSTRACT A new scheme providing self-compression of femtosecond laser radiation upon filamentatio... more ABSTRACT A new scheme providing self-compression of femtosecond laser radiation upon filamentation of a collimated beam in argon at a pressure of ~0.8 atm is experimentally realised. Pulses with the initial duration of 55 fs were compressed down to 8 fs, the peak power of the compressed pulse exceeding 20 GW.

Research paper thumbnail of Novel wireless-communicating textiles made from multi-material and minimally-invasive fibers

Sensors (Basel, Switzerland), 2014

The ability to integrate multiple materials into miniaturized fiber structures enables the realiz... more The ability to integrate multiple materials into miniaturized fiber structures enables the realization of novel biomedical textile devices with higher-level functionalities and minimally-invasive attributes. In this work, we present novel textile fabrics integrating unobtrusive multi-material fibers that communicate through 2.4 GHz wireless networks with excellent signal quality. The conductor elements of the textiles are embedded within the fibers themselves, providing electrical and chemical shielding against the environment, while preserving the mechanical and cosmetic properties of the garments. These multi-material fibers combine insulating and conducting materials into a well-defined geometry, and represent a cost-effective and minimally-invasive approach to sensor fabrics and bio-sensing textiles connected in real time to mobile communications infrastructures, suitable for a variety of health and life science applications.

Research paper thumbnail of Investigation of the transformation of the spectrum of femtosecond laser radiation on filamentation in gas medium

Optics and Spectroscopy, 2009

ABSTRACT The dependence of the parameters of femtosecond laser radiation (55 fs, 3.7 mJ, 800 nm) ... more ABSTRACT The dependence of the parameters of femtosecond laser radiation (55 fs, 3.7 mJ, 800 nm) in a filament on the distance along the filament propagation axis, the diaphragm diameter, and the type and pressure of gas used for filamentation has been studied experimentally.

Research paper thumbnail of Few-cycle optical pulse production from collimated femtosecond laser beam filamentation

Journal of the Optical Society of America B, 2010

... Citation Daria Uryupina, Maria Kurilova, Anna Mazhorova, Nikolay Panov, Roman Volkov, Stepan ... more ... Citation Daria Uryupina, Maria Kurilova, Anna Mazhorova, Nikolay Panov, Roman Volkov, Stepan Gorgutsa, Olga Kosareva, Andrei Savel'ev, and See Leang Chin, "Few-cycle optical pulse production from ... [CrossRef]; W. Liu, SL Chin, O. Kosareva, IS Golubtsov, and VP Kandidov ...

Research paper thumbnail of Flexible, Solid Electrolyte-Based Lithium Battery Composed of LiFePO4 Cathode and Li4Ti5O12 Anode for Applications in Smart Textiles

Journal of The Electrochemical Society, 2012

Here we report fabrication of flexible and stretchable battery composed of strain free LiFePO 4 c... more Here we report fabrication of flexible and stretchable battery composed of strain free LiFePO 4 cathode, Li 4 Ti 5 O 10 anode and a solid poly ethylene oxide (PEO) electrolyte as a separator layer. The battery is developed in a view of smart textile applications. Featuring solid thermoplastic electrolyte as a key enabling element this battery is potentially extrudable or drawable into fibers or thin stripes which are directly compatible with the weaving process used in smart textile fabrication. The paper first details the choice of materials, fabrication and characterisation of electrodes and a separator layer. Then the battery 10 is assembled and characterised, and finally, a large battery sample made of several long strips is woven into a textile, connectorized with conductive threads, and characterised. Within this paper, there are two practical aspects of battery design that we have investigated in details: first is making composites of cathode/anode material with optimized ratio of conducting carbon and polymer binder material, and second is battery performance including cycling, reversibility, and compatibility of the cathode/anode 15 materials. Finally, when casting electrodes and separator layer we mostly focused on using aqueous solutions instead of organic solvents in order to make the fabrication process environmentally friendly. 65

Research paper thumbnail of 3D Raman bullet formed under filamentation of femtosecond laser pulses in air and nitrogen

Applied Physics B, 2013

ABSTRACT Complex experimental study of spectral, spatial and temporal behaviors of the IR shifted... more ABSTRACT Complex experimental study of spectral, spatial and temporal behaviors of the IR shifted component observed under filamentation of the collimated femtosecond laser beam (80 GW, 50 fs, 805 nm) in molecular gases showed that this component behaves like a Raman soliton. Namely, it is confined in all domains: (a) it propagates within the filament core, (b) it has a stable duration of 30 fs along the filament, and (c) its spectrum shifts as a whole from 820 to 870 nm on the distance of 2 m from the filament start. A simple model explaining the origin of anomalous group velocity dispersion in the plasma channel of a filament is suggested.

Research paper thumbnail of Thin chalcogenide capillaries as efficient waveguides from mid-infrared to terahertz

Journal of the Optical Society of America B, 2012

We show that chalcogenide glass As 38 Se 62 capillaries can act as efficient waveguides in the wh... more We show that chalcogenide glass As 38 Se 62 capillaries can act as efficient waveguides in the whole midinfrared-terahertz (THz) spectral range. The capillaries are fabricated using a double crucible drawing technique. This technique allows to produce glass capillaries with wall thicknesses in the range of 12 to 130 μm. Such capillaries show low-loss guidance in the whole mid-IR-THz spectral range. We demonstrate experimentally that low-loss guidance with thin capillaries involves various guidance mechanisms, including Fresnel reflections at the capillary inner walls, resonant guidance (ARROW type) due to light interference in the thin capillary walls, as well as total internal reflection guidance where very thin capillary walls act as a subwavelength waveguide, which is especially easy to observe in the THz spectral range.

Research paper thumbnail of Novel Wearable RF Textile-Integrated Antennas Made from Multi-Material Fibers

Workshop on Specialty Optical Fibers and Their Applications, 2015

Research paper thumbnail of THz metamaterials using aligned metallic or semiconductor nanowires

35th International Conference on Infrared, Millimeter, and Terahertz Waves, 2010

We study the transmission of THz radiation through the metamaterial films containing metallic or ... more We study the transmission of THz radiation through the metamaterial films containing metallic or semiconductor nanowires. The nanowire arrays are made by the stack-and-draw fiber fabrication technique. Metal embedded films exhibit strong polarizing properties, in contrast with those containing semiconductor.

Research paper thumbnail of Spectral “soliton” transformation and four-wave mixing under femtosecond laser radiation filamentation in molecular gases

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009

Filaments created during propagation of an ultrashort laser pulses in gases and solids combine hi... more Filaments created during propagation of an ultrashort laser pulses in gases and solids combine high non-linearity with huge intensity and long interaction path. Four-wave mixing, coherent Raman scattering, third harmonic production and others non-linear processes were observed . These studies were made with focused laser beams, when interaction length depends on the Rayleigh length. In this paper we report on thorough investigation of new spectral components formation under filamentation of pre-collimated laser beam in molecular gases. These components arose at the red and blue sides of the initial spectrum and were attributed to the generation of vibrational Raman "spectral solitons" and their cascaded four-wave mixing.

Research paper thumbnail of Generation of optical pulses of duration down to 8 fs upon filamentation of collimated femtosecond laser radiation in argon

Quantum Electronics, 2009

ABSTRACT A new scheme providing self-compression of femtosecond laser radiation upon filamentatio... more ABSTRACT A new scheme providing self-compression of femtosecond laser radiation upon filamentation of a collimated beam in argon at a pressure of ~0.8 atm is experimentally realised. Pulses with the initial duration of 55 fs were compressed down to 8 fs, the peak power of the compressed pulse exceeding 20 GW.

Research paper thumbnail of Novel wireless-communicating textiles made from multi-material and minimally-invasive fibers

Sensors (Basel, Switzerland), 2014

The ability to integrate multiple materials into miniaturized fiber structures enables the realiz... more The ability to integrate multiple materials into miniaturized fiber structures enables the realization of novel biomedical textile devices with higher-level functionalities and minimally-invasive attributes. In this work, we present novel textile fabrics integrating unobtrusive multi-material fibers that communicate through 2.4 GHz wireless networks with excellent signal quality. The conductor elements of the textiles are embedded within the fibers themselves, providing electrical and chemical shielding against the environment, while preserving the mechanical and cosmetic properties of the garments. These multi-material fibers combine insulating and conducting materials into a well-defined geometry, and represent a cost-effective and minimally-invasive approach to sensor fabrics and bio-sensing textiles connected in real time to mobile communications infrastructures, suitable for a variety of health and life science applications.

Research paper thumbnail of Investigation of the transformation of the spectrum of femtosecond laser radiation on filamentation in gas medium

Optics and Spectroscopy, 2009

ABSTRACT The dependence of the parameters of femtosecond laser radiation (55 fs, 3.7 mJ, 800 nm) ... more ABSTRACT The dependence of the parameters of femtosecond laser radiation (55 fs, 3.7 mJ, 800 nm) in a filament on the distance along the filament propagation axis, the diaphragm diameter, and the type and pressure of gas used for filamentation has been studied experimentally.

Research paper thumbnail of Few-cycle optical pulse production from collimated femtosecond laser beam filamentation

Journal of the Optical Society of America B, 2010

... Citation Daria Uryupina, Maria Kurilova, Anna Mazhorova, Nikolay Panov, Roman Volkov, Stepan ... more ... Citation Daria Uryupina, Maria Kurilova, Anna Mazhorova, Nikolay Panov, Roman Volkov, Stepan Gorgutsa, Olga Kosareva, Andrei Savel'ev, and See Leang Chin, "Few-cycle optical pulse production from ... [CrossRef]; W. Liu, SL Chin, O. Kosareva, IS Golubtsov, and VP Kandidov ...

Research paper thumbnail of Flexible, Solid Electrolyte-Based Lithium Battery Composed of LiFePO4 Cathode and Li4Ti5O12 Anode for Applications in Smart Textiles

Journal of The Electrochemical Society, 2012

Here we report fabrication of flexible and stretchable battery composed of strain free LiFePO 4 c... more Here we report fabrication of flexible and stretchable battery composed of strain free LiFePO 4 cathode, Li 4 Ti 5 O 10 anode and a solid poly ethylene oxide (PEO) electrolyte as a separator layer. The battery is developed in a view of smart textile applications. Featuring solid thermoplastic electrolyte as a key enabling element this battery is potentially extrudable or drawable into fibers or thin stripes which are directly compatible with the weaving process used in smart textile fabrication. The paper first details the choice of materials, fabrication and characterisation of electrodes and a separator layer. Then the battery 10 is assembled and characterised, and finally, a large battery sample made of several long strips is woven into a textile, connectorized with conductive threads, and characterised. Within this paper, there are two practical aspects of battery design that we have investigated in details: first is making composites of cathode/anode material with optimized ratio of conducting carbon and polymer binder material, and second is battery performance including cycling, reversibility, and compatibility of the cathode/anode 15 materials. Finally, when casting electrodes and separator layer we mostly focused on using aqueous solutions instead of organic solvents in order to make the fabrication process environmentally friendly. 65

Research paper thumbnail of 3D Raman bullet formed under filamentation of femtosecond laser pulses in air and nitrogen

Applied Physics B, 2013

ABSTRACT Complex experimental study of spectral, spatial and temporal behaviors of the IR shifted... more ABSTRACT Complex experimental study of spectral, spatial and temporal behaviors of the IR shifted component observed under filamentation of the collimated femtosecond laser beam (80 GW, 50 fs, 805 nm) in molecular gases showed that this component behaves like a Raman soliton. Namely, it is confined in all domains: (a) it propagates within the filament core, (b) it has a stable duration of 30 fs along the filament, and (c) its spectrum shifts as a whole from 820 to 870 nm on the distance of 2 m from the filament start. A simple model explaining the origin of anomalous group velocity dispersion in the plasma channel of a filament is suggested.

Research paper thumbnail of Thin chalcogenide capillaries as efficient waveguides from mid-infrared to terahertz

Journal of the Optical Society of America B, 2012

We show that chalcogenide glass As 38 Se 62 capillaries can act as efficient waveguides in the wh... more We show that chalcogenide glass As 38 Se 62 capillaries can act as efficient waveguides in the whole midinfrared-terahertz (THz) spectral range. The capillaries are fabricated using a double crucible drawing technique. This technique allows to produce glass capillaries with wall thicknesses in the range of 12 to 130 μm. Such capillaries show low-loss guidance in the whole mid-IR-THz spectral range. We demonstrate experimentally that low-loss guidance with thin capillaries involves various guidance mechanisms, including Fresnel reflections at the capillary inner walls, resonant guidance (ARROW type) due to light interference in the thin capillary walls, as well as total internal reflection guidance where very thin capillary walls act as a subwavelength waveguide, which is especially easy to observe in the THz spectral range.