Publications (5)
Optical nonlinearity due to intersubband transitions in semiconductor quantum wells
Sanghamitra Mukhopadhyay, K. C. Rustagi
We have calculated the contribution of intersubband transitions to the third order optical nonlinear susceptibility, for nonresonant as well as resonant third…
Investigations of temperature-dependent photoluminescence of uncoated and silver-coated CdS quantum dots
P. Ghosh, D. Kushavah, P. K. Mohapatra +3
We report temperature-dependent photoluminescence (PL) studies and PL relaxation dynamics for uncoated and silver-coated CdS quantum dots (QDs). Room-temperature photoluminescence…
Observation of four-photon absorption and determination of corresponding nonlinearities in CdS quantum dots
P. Ghosh, E. Ramya, P. K. Mohapatra +5
Bound- and excited-state electronic nonlinearities in CdS quantum dots have been investigated by Degenerate Four-Wave Mixing (DFWM) and Z-scan techniques in the femtosecond time re…
Optical Limiting in Single-walled Carbon Nanotube Suspensions
S. R. Mishra, H. S. Rawat, S. C. Mehendale +5
Optical limiting behaviour of suspensions of single-walled carbon nanotubes in water, ethanol and ethylene glycol is reported. Experiments with 532 nm, 15 nsec duration laser pulse…
Re-examination of the SiGe Raman spectra - Linear chain approximation and ab initio calculations
O. Pagès, J. Souhabi, V. J. B. Torres +2
We propose a (three-dimension) -> (one-dimension) shift of paradigm for basic understanding of Raman spectra of random Si-Ge. Fair contour modeling of Raman spectra is achieved alo…