Role of Electrostatics innano-plasmonics and nano-acoustics

Interaction of light with metal thin films or nanoparticles can result in a resonant coupling of surface plasmon polaritons with photons in a light emitter due to the modification in the spontaneous emission rate which can also lead to an enhancement of internal quantum efficiency of a LED.  However, in the off-resonant regime with inhomogeneous metal surfaces, electrostatic interactions can dominate the carrier recombination process and results in localization of light and increased light emission. We demonstrate the role of electrostatics in the light emission process in Silicon photonics, wide-bandgap nitrides (InGaN/GaN) and AlGaAs/GaAs quantum well structures. These plasmonic and electrostatic effects also influences the coherent acoustic phonon generation in a hybrid metal-semiconductor multiple quantum well structure.  We demonstrate that the THz generation due to zone-folded longitudinal acoustic phonons in InGaN/GaN multiple quantum well can be modified due to the modification of electron-phonon coupling.