Prof. Jayan Thomas Profile

Prof. Jayan Thomas

Assistant Professor at Univ of Central Florida

SPIE Involvement:

Conference Program Committee | Author

Publications (20)

PROCEEDINGS ARTICLE | August 25, 2017

Enhanced nonlinear optical limiting in TiS2 dichalcogenide 2D Sheets

Proc. SPIE. 10360, Light Manipulating Organic Materials and Devices IV

KEYWORDS: Titanium, Graphene, Sensors, Laser applications, Transition metals, Quantum dots, Laser irradiation, Nonlinear optics, Optical limiting, Molybdenum

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PROCEEDINGS ARTICLE | September 25, 2013

Enhanced gain dynamics in photorefractive polymers

Proc. SPIE. 8847, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VII

KEYWORDS: Polymers, Electrons, Ions, Manufacturing, Chromophores, Analytical research, Neodymium, Electro optics, Electroluminescent displays, Photorefractive polymers

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PROCEEDINGS ARTICLE | September 10, 2013

Recent advances in optical limiting properties of fluorinated graphene oxides

Proc. SPIE. 8827, Optical Processes in Organic Materials and Nanostructures II

KEYWORDS: Oxides, Carbon, Lithium, Scattering, Graphene, Nonlinear optics, Photoacoustic spectroscopy, Optical limiting, Fluorine, Absorption

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PROCEEDINGS ARTICLE | September 17, 2011

Recent advances in photorefractive polymers

Proc. SPIE. 8113, Linear and Nonlinear Optics of Organic Materials XI

KEYWORDS: Diffraction, Holograms, Holography, Polymers, Glasses, Composites, Chromophores, 3D displays, Photorefractive polymers, 3D image processing

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PROCEEDINGS ARTICLE | September 17, 2011

Optical nonlinearity and power limiting in organic molecules and nanocomposites

Proc. SPIE. 8113, Linear and Nonlinear Optics of Organic Materials XI

KEYWORDS: Semiconductors, Polymers, Molecules, Composites, Electrons, Nonlinear optics, Four wave mixing, Nanocomposites, Polymer thin films, Absorption

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PROCEEDINGS ARTICLE | August 24, 2010

Hybrid DNA materials for energy storage

Proc. SPIE. 7765, Nanobiosystems: Processing, Characterization, and Applications III

KEYWORDS: Thin films, Ferroelectric materials, Capacitors, Nanoparticles, Polymers, Composites, Dielectrics, Sol-gels, Nanocomposites, Dielectric breakdown

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PROCEEDINGS ARTICLE | August 23, 2010

Nanoimprinted photonic devices

Proc. SPIE. 7788, Polymer Optics Design, Fabrication, and Materials

KEYWORDS: Fabrication, Photonic devices, Nanostructures, Polymers, Ultraviolet radiation, Composites, Printing, Nanoimprint lithography, Nanophotonics, Nanolithography

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PROCEEDINGS ARTICLE | March 1, 2010

Complementary grating dynamics in photorefractive polymers with Alq3

Proc. SPIE. 7599, Organic Photonic Materials and Devices XII

KEYWORDS: Holography, Polymers, Molecules, Composites, Dielectrics, Ocean optics, Aluminum, Electron transport, Photorefractive polymers, Absorption

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PROCEEDINGS ARTICLE | February 11, 2010

Future of photorefractive based holographic 3D display

Proc. SPIE. 7619, Practical Holography XXIV: Materials and Applications

KEYWORDS: Eye, Holograms, Holography, Video, Manufacturing, Multiplexing, Medical imaging, 3D displays, Pulsed laser operation, Photorefractive polymers

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PROCEEDINGS ARTICLE | August 21, 2009

Transmission, reflection, and absorption gratings in photorefractive polymers

Proc. SPIE. 7420, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications III

KEYWORDS: Refractive index, Einsteinium, Reflection, Polymers, Energy transfer, Crystals, Diffusion, Photorefractive polymers, Phase shifts, Absorption

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PROCEEDINGS ARTICLE | February 11, 2008

Polymer nanocomposite infiltration of silicon photonic crystals

Proc. SPIE. 6901, Photonic Crystal Materials and Devices VII

KEYWORDS: Refractive index, Titanium dioxide, Nanoparticles, Polymers, Crystals, Composites, Photonic crystals, Silicon photonics, Nanocomposites, Photorefractive polymers

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PROCEEDINGS ARTICLE | October 6, 2006

Photorefractive polymer in reflection geometry with large efficiency

Proc. SPIE. 6331, Linear and Nonlinear Optics of Organic Materials VI

KEYWORDS: Diffraction, Refractive index, Holograms, Birefringence, Reflection, Polymers, Composites, Chromophores, Photorefractive polymers, Diffraction gratings

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PROCEEDINGS ARTICLE | September 14, 2006

New organic infiltrants for 2-D and 3-D photonic crystals

Proc. SPIE. 6331, Linear and Nonlinear Optics of Organic Materials VI

KEYWORDS: Carbon, Diffraction, Refractive index, Polymers, Metals, Glasses, Silicon, Photonic crystals, Chemical vapor deposition, Infrared radiation

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Photonic crystals have now started to make the transition from basic to applied research, with new materials systems and device results being published on a frequent basis. While a number of photonic crystals have been made using organic materials, the lack of high index organic materials has impeded their development. We have investigated several novel high index organic systems for use in both 2-D and 3-D photonic crystals. 2-D photonic crystal templates were made by a rapid multibeam interference method in the photoresist SU-8, using 532nm laser radiation. These samples, typically on glass, were then infiltrated by a number of methods including from solution and melt, as well through chemical vapor deposition. Solutions of a titanium precursor with a cured refractive index of 2.1 at 633nm were infiltrated and cured in the SU-8 structure, with the infiltrant deposited by both by spin coating and casting. The resulting structure was shown to preserve the six-fold symmetry of the initial photonic crystal and subsequent firing at high temperature effectively removed the SU-8 template. We have also explored the infiltration of nanoamorphous carbon into the photonic crystals using chemical vapor deposition. This material, which is essentially a carbon-silicon ceramic, has exceptional infrared optical properties with a refractive index > 2 for wavelengths beyond 2 μm. The SU-8 polymer template has been shown to survive the CVD deposition process and the resulting infiltrated structure also preserves the initial PC symmetry. A series of metal-like PCs with a full range of properties is enabled by the ability to dope the nanoamorphous carbon with metals that possess exceptional refractive indices in the infrared regions of interest. We have also investigated the potential for nonlinear optical devices based upon azobenzene copolymer infiltrated silicon PCs and demonstrate the excellent properties of this material with respect to all-optical effects.

PROCEEDINGS ARTICLE | September 13, 2006

Photorefractive polymers with sub-millisecond response time

Proc. SPIE. 6335, Organic Holographic Materials and Applications IV

KEYWORDS: Diffraction, Holograms, Holography, Polymers, Composites, Chromophores, Pulsed laser operation, Photorefractive polymers, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | August 30, 2006

Efficient local fixing of photorefractive polymer holograms using a laser beam

Proc. SPIE. 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII

KEYWORDS: Diffraction, Holograms, Holography, Data storage, Polymers, Glasses, Sapphire, Gas lasers, Carbon monoxide, Photorefractive polymers

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PROCEEDINGS ARTICLE | August 30, 2005

Lanthanide nanoparticle doped low-loss sol-gel amplifier materials

Proc. SPIE. 5935, Linear and Nonlinear Optics of Organic Materials V

KEYWORDS: Refractive index, Optical amplifiers, Waveguides, Nanoparticles, Polymers, Ions, Erbium, Sol-gels, Lanthanum, Absorption

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Organic-inorganic hybrid sol-gel materials have attracted increasing attention in recent years as low-cost, rugged materials for integrated optical devices such as optical couplers, splitters, and electro-optic modulators. These materials can be easily processed by spin-coating, wet-etching photolithography, and low-temperature baking. Precise control of waveguide core-cladding refractive indices produces well-confined low-loss propagation and good matching of the absolute refractive index to that of fused silica results in low optical coupling loss to optical fiber. The increased thermal and mechanical stability of these materials, relative to optical polymers, results in numerous packaging options and improved reliability. However organic-inorganic hybrid sol-gel materials have not yet been often used as host of active dopants such as erbium (III) ions for 1550nm optical amplification. This limitation owes primarily to matrix and chelate dominated nonradiative relaxation processes, as high phonon energy OH and OH-like oscillators can bridge off the energy from the excited erbium (III) ions at very high rates. Different strategies have been proposed to protect erbium (III) ions from matrix and chelate quenching, including host and ligand fluorination, and inorganic microstructure shielding. Here we report on our work of encapsulating erbium (III) ions in transparent, refractive index matched, and highly re-dispersible lanthanum phosphate nanoparticles and the work of examining the optical properties of these nanoparticles as active dopants in organic-inorganic hybrid sol-gels adopting 2-methacryloxypropyl trimethoxysilane (MAPTMS) as a precursor. 980nm laser pumped photoluminescence at 1535nm was obtained from solid bulk samples of 300mg La.₉₉Er.₀₁PO₄ nanoparticles doped in 1mL hybrid sol-gel. Thick bulk samples of this composition exhibited exceptional clarity and little trace of nanoparticle scattering effects. The lifetime of the nanoparticle doped hybrid sol-gel composite was measured to be 220μs, indicating an intermediate relaxation rate between that of an erbium organic complex and annealed erbium doped glass. La.₉₉Er.₀₁PO₄ nanoparticle doped hybrid sol-gel films were also prepared and the refractive index was measured to be 1.4966 at 1550nm, which is very close to that of optical fiber and provides a suitable index difference from an undoped and metal oxide tuned sol-gel at 1.4870 to comprise an efficient single-mode waveguide system.

PROCEEDINGS ARTICLE | October 26, 2004

Near-infrared photorefractive polymer composites with high diffraction efficiency and fast response time

Proc. SPIE. 5521, Organic Holographic Materials and Applications II

KEYWORDS: Diffraction, Refractive index, Modulation, Birefringence, Polymers, Composites, Chromophores, Photorefractive polymers, Telescopic pixel displays, Absorption

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PROCEEDINGS ARTICLE | October 26, 2004

Trapping mechanisms and dynamics in bis-triarylamine-based photorefractive polymer composites

Proc. SPIE. 5521, Organic Holographic Materials and Applications II

KEYWORDS: Polymers, Spectroscopy, Molecules, Composites, Numerical simulations, Chromophores, Solids, Thermal modeling, Photorefractive polymers, Absorption

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