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

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6 Author(s)
Das, N. ; Electron Sci. Res. Inst., Edith Cowan Univ., Joondalup, WA, Australia ; Karar, A. ; Vasiliev, M. ; Chee Leong Tan
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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.

Published in:

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

Date of Conference:

17-20 Aug. 2010