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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2013, 4 (3), P. 378–386

DIELECTRIC WAVEGUIDE OPTIMIZATION FOR THE ENHANCEMENT OF TE-POLARIZATION TRANSMISSION OF PLASMONICS-BASED MSM-PD

Ayman Karar – Electron Science Research Institute, Edith Cowan University, AU; a.karar@ecu.edu.au
Chee Leong Tan – School of Photonics Science, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea; ccheelong@gist.ac.kr
Kamal Alameh – Electron Science Research Institute, Edith Cowan University, AU; Department of Nanobio Materials and Electronics, World Class University (WCU), GIST, Republic of Korea; k.alameh@ecu.edu.au
Yong Tak Lee – School of Photonics Science, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea; Department of Information and Communications, GIST, Republic of Korea; Department of Nanobio Materials and Electronics, World Class University (WCU), GIST, Republic of Korea; ytlee@gist.ac.kr

In this paper, we use the finite difference time-domain (FDTD) method to optimize the TE-polarized light transmission of a metal-semiconductor-metal photodetector (MSM-PD) employing a dielectric waveguide on top of metal nano-gratings. Simulation results demonstrate that the funneling transmission of the TE-polarized light through the nanoslit of the MSM-PD structure is highly dependent on the structure geometries, such as the waveguide and nano-grating heights. We also demonstrate that adding a dielectric waveguide layer on top of the nano-metal gratings supports both the TM- and TE polarizations, and enhances the light transmission for TE-polarization around 3-times in comparison with conventional plasmonics MSMPD structures.

Keywords: FDTD simulation, MSM-PD, waveguide, plasmonics, nano-gratings, surface plasmon.

PACS 42.25.Bs, 42.25.Ja, 73.50.Pz

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