Coupling of THz radiation with intervalence band transitions in microcavities

PEREIRA, Mauro and FARAGAI, I. A. (2014). Coupling of THz radiation with intervalence band transitions in microcavities. Optics Express, 22 (3), p. 3439.

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Official URL: http://dx.doi.org/10.1364/OE.22.003439
Link to published version:: 10.1364/OE.22.003439

Abstract

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.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1364/OE.22.003439
Depositing User: Helen Garner
Date Deposited: 31 Oct 2014 14:30
Last Modified: 20 Oct 2016 00:20
URI: http://shura.shu.ac.uk/id/eprint/8644

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