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Pure Appl. Chem., 2011, Vol. 83, No. 11, pp. 2107-2113

Published online 2011-07-07

Metal-semiconductor-metal (MSM) photodetectors with plasmonic nanogratings*

Narottam Das1*, Ayman Karar1, Chee Leong Tan2, Mikhail Vasiliev1, Kamal Alameh3,1* and Yong Tak Lee2,3

1 Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia
2 Department of Information and Communications, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju, 500-712, Korea
3 Department of Nanobio Materials and Electronics, GIST, Korea

Abstract: We discuss the light absorption enhancement factor dependence on the design of nanogratings inscribed into metal-semiconductor-metal photodetector (MSM-PD) structures. These devices are optimized geometrically, leading to light absorption improvement through plasmon-assisted effects. Finite-difference time-domain (FDTD) simulation results show ~50 times light absorption enhancement for 850 nm light due to improved optical signal propagation through the nanogratings. Also, we show that the light absorption enhancement is strongly dependent on the nanograting shapes in MSM-PDs.