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

fYear

2014

fDate

14-19 Sept. 2014

Firstpage

1

Lastpage

2

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on

Conference_Location

Tucson, AZ

Type

conf

DOI

10.1109/IRMMW-THz.2014.6956481

Filename

6956481