Title :
Cavity modes in hybrid structure of QWIP and plasmonic cavity
Author :
Qian Li ; Zhifeng Li ; Ning Li ; Xiaoshuang Chen ; Pingping Chen ; XueChu Shen ; Wei Lu
Author_Institution :
Nat. Lab. for Infrared Phys., Shanghai Inst. of Tech. Phys., Shanghai, China
Abstract :
We report an observation of cavity modes in a grating plasmonic cavity sandwiching a QWIP in the wavelength range of 10-13 μm. The normal incident light is squeezed into the 0.9 μm-thick subwavelength cavity to form standing wave modes, causing the QWIP photocurrent responses to be 25-fold enhanced comparing with its 45-degree coupled counterpart. The cavity modes are recognized to be localized surface plasmon mode and surface plasmon polariton mode. Their dependences on grating period and strip width are investigated.
Keywords :
diffraction gratings; infrared detectors; photodetectors; plasmonics; quantum well devices; surface plasmons; QWIP photocurrent response; cavity modes; grating period; hybrid structure; localized surface plasmon mode; normal incident light; plasmonic cavity; quantum well infrared photodetector; standing wave modes; strip width; surface plasmon polariton mode; wavelength 0.9 mum; wavelength 10 mum to 13 mum; Cavity resonators; Detectors; Gold; Gratings; Plasmons; Strips; Surface waves;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956481
