Metal-Grating-Coupled Terahertz Quantum-Well Photodetectors

Author

Zhang, R. ; Guo, X.G. ; Song, C.Y. ; Buchanan, M. ; Wasilewski, Z.R. ; Cao, J.C. ; Liu, H.C.

Author_Institution

Key Lab. of Terahertz Solid-State Technol., Chinese Acad. of Sci., Shanghai, China

Volume

32

Issue

5

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

659

Lastpage

661

Abstract

Three terahertz (THz) GaAs/AlGaAs quantum-well photodetectors with different 1-D metal gratings are fabricated for front-incident detection of THz waves. Photocurrent spectra are acquired and compared with 45° incident facet samples (without grating), and peak responsivities are determined with a calibrated blackbody radiation source. The results show that these gratings can couple THz waves into detectors effectively, resulting in good detector responsivities. The modal method is employed to simulate the light coupling efficiency and the optimization conditions of the gratings.

Keywords

optimisation; photodetectors; quantum well devices; 1D metal gratings; THz waves; blackbody radiation source; detector responsivities; front-incident detection; incident facet samples; light coupling efficiency; metal-grating-coupled terahertz quantum-well photodetectors; optimization; photocurrent spectra; terahertz GaAs/AlGaAs quantum-well photodetectors; Couplings; Detectors; Diffraction gratings; Gallium arsenide; Gratings; Metals; Photodetectors; Detector; grating; quantum well (QW); terahertz (THz);

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2011.2112632

Filename

5737762