Design of terahertz quantum-well photodetectors

Author

Guo, X.G. ; Cao, J.C. ; Liu, H.C.

Author_Institution

Key Lab. of Terahertz Solid-State Technol., Shanghai Inst. of Microsyst. & Inf., Shanghai, China

fYear

2012

fDate

28-31 Aug. 2012

Firstpage

9

Lastpage

10

Abstract

Terahertz quantum-well photodetectors (QWPs) represent a new and emerging photon-type detector in terahertz region. We first discuss the many-particle effects on the accurate design of terahertz QWPs. Grating and metal-cavity light couplers for terahertz QWPs are introduced. At resonant coupling frequencies, the polarization of light field is effectively changed by the light couplers to fulfill the selection rule of intersubband transition. Meanwhile, the electric field intensities in the active multi-quantum-well region of terahertz QWPs are enhanced. The performance of terahertz QWPs with these light couplers is improved significantly.

Keywords

diffraction gratings; optical couplers; optical design techniques; photodetectors; quantum well devices; terahertz wave detectors; diffraction grating; electric field intensity; intersubband transition; light field polarization; many particle effect; metal-cavity light coupler; multiquantum well region; resonant coupling frequency; terahertz quantum well photodetectors; Cavity resonators; Couplers; Couplings; Gratings; Metals; Photoconductivity; Photodetectors; grating; metal cavity; quantum-well photodetectors; terahertz;

fLanguage

English

Publisher

ieee

Conference_Titel

Numerical Simulation of Optoelectronic Devices (NUSOD), 2012 12th International Conference on

Conference_Location

Shanghai

ISSN

2158-3234

Print_ISBN

978-1-4673-1602-6

Type

conf

DOI

10.1109/NUSOD.2012.6316519

Filename

6316519