Dr. G. A. Kumar Profile

Dr. G. A. Kumar

Research Associate at Univ of Texas at San Antonio

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 19 February 2013 Paper

Rare Earth doped nanoparticles in imaging and PDT

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

Proceedings Volume 8594, 85940D (2013) https://doi.org/10.1117/12.2004939

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

Read Abstract +

Proceedings Article | 21 February 2012 Paper

Energy converting material for solar cell application

Madhab Pokhrel, G Kumar, Dhiraj Sardar

Proceedings Volume 8256, 82561Q (2012) https://doi.org/10.1117/12.906835

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

Read Abstract +

Proceedings Article | 6 February 2012 Paper

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

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

Proceedings Volume 8278, 82780E (2012) https://doi.org/10.1117/12.906804

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

Read Abstract +

Proceedings Article | 2 February 2012 Paper

Highly efficient phosphors in cancer sensing and PDT

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

Proceedings Volume 8233, 823312 (2012) https://doi.org/10.1117/12.908986

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

Read Abstract +

Proceedings Article | 12 February 2010 Paper

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

Proceedings Volume 7565, 75650B (2010) https://doi.org/10.1117/12.846680

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

Read Abstract +

Proceedings Article | 28 February 2007 Paper

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

Proceedings Volume 6427, 642717 (2007) https://doi.org/10.1117/12.700252

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

Read Abstract +

Proceedings Article | 7 December 2001 Paper

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

Proceedings Volume 4461, (2001) https://doi.org/10.1117/12.449832

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

Read Abstract +

Proceedings Article | 2 November 2001 Paper

Spectroscopic characterization of Nd3+ doped barium fluoroborophosphate and fluorosulphatephosphate glasses

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

Proceedings Volume 4452, (2001) https://doi.org/10.1117/12.446891

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

Read Abstract +

Proceedings Article | 2 November 2001 Paper

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

Proceedings Volume 4452, (2001) https://doi.org/10.1117/12.446890

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

Read Abstract +

Proceedings Article | 1 May 2001 Paper

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

G. Kumar, Oracio Barbosa-Garcia

Proceedings Volume 4268, (2001) https://doi.org/10.1117/12.424626

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

Read Abstract +

Proceedings Article | 27 April 2001 Paper

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

Proceedings Volume 4282, (2001) https://doi.org/10.1117/12.424782

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

Read Abstract +

Showing 5 of 11 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years