Title :
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
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;
Conference_Titel :
Numerical Simulation of Optoelectronic Devices (NUSOD), 2012 12th International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4673-1602-6
DOI :
10.1109/NUSOD.2012.6316519
