Title :
Design and analysis of quantum ring photodetector enhanced by metallic slits
Author :
Alihosseini, Faramarz ; Ahmadi, Vahid ; Mir, Amna
Author_Institution :
Dept. of Electr. & Comp. Eng., Tarbiat Modares Univ., Tehran, Iran
Abstract :
Effects of subwavelength metallic slits on the absorption efficiency using finite element method (FEM) are investigated. A Fabry-Perot (FP) cavity with Au slits and Au film acting as two reflectors is utilized to support resonance mode in multispectral bands. With considering this special feature, we propose an enhanced quantum ring photodetector in the terahertz range of the electromagnetic spectrum. Electric field distribution at different modes is studied and dependences of the resonant absorption behaviours on the device parameters are shown. Compared with the conventional quantum ring photodetector the designed photodetector provides about 47 times absorption enhancement at the frequency of 7.1 THz.
Keywords :
electromagnetic devices; finite element analysis; photodetectors; submillimetre wave detectors; terahertz wave detectors; FEM; FP cavity; Fabry-Perot cavity; absorption efficiency; electric field distribution; electromagnetic spectrum; enhanced quantum ring photodetector; finite element method; frequency 7.1 THz; multispectral band; reflector; resonant absorption behaviours; subwavelength metallic slit effect; Absorption; Cavity resonators; Electric fields; Gold; Optical resonators; Photodetectors; Quantum dots; Absorption enhancement; Fabry-Perot cavity; Metallic slits; Quantum ring;
Conference_Titel :
Electrical Engineering (ICEE), 2013 21st Iranian Conference on
Conference_Location :
Mashhad
DOI :
10.1109/IranianCEE.2013.6599836
