Groove shape-dependent absorption enhancement of 850 nm MSM photodetectors with nano-gratings

Author

Das, Narottam ; Karar, Abdullah ; Vasiliev, Mikhail ; Tan, Chee Leong ; Alameh, Kamal ; Lee, Youg Tak

Author_Institution

Electron Sci. Res. Inst., Edith Cowan Univ., Joondalup, WA, Australia

fYear

2010

fDate

17-20 Aug. 2010

Firstpage

289

Lastpage

293

Abstract

Finite difference time-domain (FDTD) analysis is used to investigate the light absorption enhancement factor dependence on the groove shape of the nano-gratings etched into the surfaces of metal-semiconductor-metal photodetector (MSM-PD) structures. By patterning the MSM-PDs with optimized nano-gratings a significant improvement in light absorption near the design wavelength is achieved through plasmon-assisted electric field concentration effects. Simulation results show about 50 times light absorption enhancement for 850 nm light due to improved optical signal propagation through the nano-gratings.

Keywords

diffraction gratings; light absorption; photoconducting materials; photodetectors; MSM photodetectors; finite difference time domain analysis; groove shape dependent absorption enhancement; light absorption enhancement; metal-semiconductor-metal photodetector; nanogratings; optical signal propagation; plasmon assisted electric field concentration effects; wavelength 850 nm; FDTD simulation; MSM photodetectors; nanophotonics; plasmonic nano-gratings; surface plasmon polaritons;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology (IEEE-NANO), 2010 10th IEEE Conference on

Conference_Location

Seoul

ISSN

1944-9399

Print_ISBN

978-1-4244-7033-4

Electronic_ISBN

1944-9399

Type

conf

DOI

10.1109/NANO.2010.5697754

Filename

5697754