Abstract-Coupling of THz radiation with intervalence band transitions in microcavities

M. F. Pereira, Jr. and I. A. Faragai  »View Author Affiliations

Optics Express, Vol. 22, Issue 3, pp. 3439-3446 (2014)
http://dx.doi.org/10.1364/OE.22.003439

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-3-3439

The strong coupling of THz radiation and material excitations can improve the quantum efficiency of THz emitters. In this paper, we investigate THz polaritons and antipolaritons based on valence band transitions, which allow TE coupling in a simple configuration. The approach can improve the quantum efficiency of THz based devices based on TE mode in the strong coupling regime of THz radiations and intervalence bands transitions in a GaAs/AlGaAs quantum wells. A Nonequilibrium Many Body Approach for the optical response beyond the Hartree-Fock approximation is used as input to the effective dielectric function formalism for the polariton/antipolariton problem. The energy dispersion relations in the THz range are obtained by adjusting the full numerical solutions to simple analytical expressions, which can be used for non specialists in a wide number of new structures and material systems. The combination of manybody and nonparabolicity at high densities leads to dramatic changes in the polariton spectra in a nonequilibrium configuration, which is only possible for intervalence band transitions.

© 2014 Optical Society of America

Abstract-Interaction of valence band excitations and terahertz TE-polarized cavity modes

• I. A. Faragai, 
• M. F. Pereira

http://link.springer.com/article/10.1007%2Fs11082-013-9780-3

The strong coupling of THz radiation and material excitations has potential to improve the quantum efficiency of THz devices. In this paper, we investigate a simple structure delivering THz polaritons and antipolaritons based on valence band transitions. The approach can improve the quantum efficiency of THz based devices based on TE mode in the strong coupling regime of THz radiations and intervalence bands transitions in a GaAs/AlGaAs quantum well. A Nonequilibrium Many Body Approach for the optical response beyond the Hartree–Fock approximation is used as input to the effective dielectric function formalism for the polariton/antipolariton problem. The energy dispersions relations in the THz range are obtained based on simplified analytical approximation.