Impact of metal nano-grating phase-shift on plasmonic MSM photodetectors

Document Type

Conference Proceeding


Faculty of Health, Engineering and Science


School of Engineering


Originally published as Das, N., Karar, A., Tan, C. L., Alameh, K., & Lee, Y. T. (2010). Impact of metal nano-grating phase-shift on plasmonic MSM photodetectors. Paper presented at the 7th International Symposium on High-capacity Optical Networks and Enabling Technologies,19-21 Dec. 2010. Original article available here.


In this paper, finite difference time-domain (FDTD) method is used to simulate the light absorption enhancement in a plasmonic metal-semiconductor-metal photodetector (MSM-PD) structure employing a metal nano-grating with phase-shifts. The metal fingers of the MSM-PDs are etched with appropriate depths to maximize light absorption through plasmonic effects into a subwavelength aperture. Simulation results show that the nano-grating phase-shift red-shifts the wavelength at which the light absorption enhancement maximum, and that the combined effects of the nano-grating groove shape and the nano-grating phase-shift, degrade the light absorption enhancement by up to 50%.




Link to publisher version (DOI)