Dr. G. A. Kumar Profile

Dr. G. A. Kumar

Research Associate at Univ of Texas at San Antonio

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Publications (11)

Proceedings Article | 19 February 2013

Rare Earth doped nanoparticles in imaging and PDT

Brian Yust, Dhiraj Sardar, Lawrence Mimun, Ajith Gangadharan, Andrew Tsin

Proc. SPIE. 8594, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications X

KEYWORDS: Infrared imaging, Near infrared, Photodynamic therapy, Biomedical optics, Nanoparticles, Photons, Ions, Infrared radiation, Upconversion, Infrared photography

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Proceedings Article | 21 February 2012

Energy converting material for solar cell application

Madhab Pokhrel, G Kumar, Dhiraj Sardar

Proc. SPIE. 8256, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices

KEYWORDS: Solar energy, Solar cells, Luminescence, Photons, Crystals, Ytterbium, Infrared radiation, Erbium, Upconversion, Absorption

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Proceedings Article | 6 February 2012

Infrared excited Yb:Er: Y2O2S phosphors with intense emission for lighting applications

G. A. Kumar, Madhab Pokhrel, D. Sardar

Proc. SPIE. 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI

KEYWORDS: Biomedical optics, Luminescence, Quantum efficiency, Ytterbium, Infrared radiation, Erbium, Upconversion, Solid state physics, Electro optical modeling, Absorption

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Proceedings Article | 2 February 2012

Highly efficient phosphors in cancer sensing and PDT

Brian Yust, Lawrence Mimun, Dhiraj Sardar, Gangadharan Ajith Kumar, Peter Hornsby, Jason Rocha

Proc. SPIE. 8233, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV

KEYWORDS: Photodynamic therapy, Cancer, Nanoparticles, Polymers, Particles, Molecules, Coating, Ytterbium, Upconversion, Atmospheric particles

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Proceedings Article | 12 February 2010

Novel applications of diagnostic x-rays in activating photo-agents through x-ray induced visible luminescence from rare-earth particles: an in vitro study

Erkinay Abliz, Joshua Collins, Joseph Friedberg, Ajith Kumar, Howard Bell, Ronald Waynant, Darrell Tata

Proc. SPIE. 7565, Biophotonics and Immune Responses V

KEYWORDS: Visible radiation, Photodynamic therapy, Tumors, Particles, Luminescence, X-rays, Diagnostics, Oxygen, Absorbance, Atmospheric particles

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Proceedings Article | 28 February 2007

Infrared light utilized for photodynamic therapy by activation of rare earth phosphors for visible light generation

Joshua Collins, Thiru Lakshman, Jarod Finlay, Ajith Kumar, Howard Bell, Ba Nguyen, Valery Belov, Jun Luo, Joseph Friedberg

Proc. SPIE. 6427, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XVI

KEYWORDS: Visible radiation, Photodynamic therapy, Cancer, Tumors, Toxicity, Infrared radiation, Lung cancer, Tissue optics, Nanocrystals, In vitro testing

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Proceedings Article | 7 December 2001

Fluorescence characterization of the ternary system TMQ-PBDBD365-POPOP-dye-doped polystyrene optical fiber under gamma and UV irradiation

Elder de la Rosa-Cruz, Luis Diaz-Torres, R. Rodriguez-Rojas, G. Kumar, Carl Dirk, Osvaldo Rodriguez, Sarah Kopecky, Jose Hernandez, Y. Diaz-Torres

Proc. SPIE. 4461, Linear and Nonlinear Optics of Organic Materials

KEYWORDS: Optical fibers, Polymers, Luminescence, Scintillators, Gamma radiation, Polymer optical fibers, Picosecond phenomena, Chlorine, Binary data, Absorption

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Proceedings Article | 2 November 2001

Nonradiative energy transfer process in the system Sm3+: ZrO2 prepared by sol-gel technique

Elder de la Rosa-Cruz, Luis Diaz-Torres, Ajith Kumar, Maximiliano Avendano, Pedro Salas, V. Castano Meneses, Jose Hernandez

Proc. SPIE. 4452, Inorganic Optical Materials III

KEYWORDS: Oxides, Luminescence, Energy transfer, Crystals, Ions, Photonics, Sol-gels, Zirconium, Samarium, Absorption

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Proceedings Article | 2 November 2001

Spectroscopic characterization of Nd3+ doped barium fluoroborophosphate and fluorosulphatephosphate glasses

Elder de la Rosa-Cruz, Ajith Kumar, Luis Diaz-Torres, Alejandrina Martinez, Oracio Barbosa

Proc. SPIE. 4452, Inorganic Optical Materials III

KEYWORDS: Refractive index, Matrices, Glasses, Spectroscopy, Luminescence, Ions, Quantum efficiency, Neodymium, Barium, Absorption

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Proceedings Article | 1 May 2001

Nonlinear optical response and reverse saturable absorption of rare-earth phthalocyanine in DMF solution

G. Kumar, Oracio Barbosa-Garcia

Proc. SPIE. 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials

KEYWORDS: Chemical species, Metals, High power lasers, Molecules, Silver, Nd:YAG lasers, Nonlinear optics, Optical limiting, Saturable absorption, Absorption

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Proceedings Article | 27 April 2001

Energy transfer in Tb:Nd system and composition dependence of the J-O parameters and radiative properties of Nd3+ ions of fluorophosphate glasses

G. Kumar, Elder de la Rosa-Cruz, Oracio Barbosa-Garcia

Proc. SPIE. 4282, Rare-Earth-Doped Materials and Devices V

KEYWORDS: Oscillators, Glasses, Luminescence, Energy transfer, Ions, Terbium, Sodium, Neodymium, Probability theory, Absorption

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Showing 5 of 11 publications

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