Title :
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
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;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2010 10th IEEE Conference on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-7033-4
Electronic_ISBN :
1944-9399
DOI :
10.1109/NANO.2010.5697754
