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Optimal subwavelength design for efficient light trapping in central slit of plasmonics-based metal-semiconductor-metal photodetector


We present the analysis of a novel plasmonics-based metal-semiconductor-metal photodetector that dramatically modifies the light transmission spectra when the sub-wavelength central slit is partly covered with a gold (Au) thin film. The simulation results reveal surface plasmons together with the optimized nano-gratings impact in this special design for quality light absorption inside the device active region. Finite-difference time-domain method has been utilized to simulate the behavior of the proposed novel photodetector structure with significant improved light absorption capacity.

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Correspondence to Farzaneh Fadakar Masouleh.

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Masouleh, F.F., Das, N. & Rozati, S.M. Optimal subwavelength design for efficient light trapping in central slit of plasmonics-based metal-semiconductor-metal photodetector. Opt Quant Electron 47, 1477–1485 (2015).

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  • FDTD simulation
  • Plasmonics-based MSM-PDs
  • Subwavelength slit
  • Surface plasmon polariton