Optimization of light transmission efficiency for nano-grating assisted MSM-PDs by varying physical parameters |
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| Institution: | 1. Physics Group, The University of Guilan, Rasht, Iran;2. Department of Electrical and Computer Engineering, Curtin University, Perth, WA 6845, Australia;1. Department of Digital Technology Design, Tungfang Design Institute, Hunei, Kaohsiung 82941, Taiwan;2. Department of Electronic Engineering, Tungnan University, Shenkeng, New Taipei 22202, Taiwan;3. Department of Electrical Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan;4. Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA;5. Institute of Photonics and Optoelectronics, Department of Electrical Engineering, Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan;1. Department of Electromagnetic Field, Czech Technical University in Prague, Technicka 2, 16627 Prague, Czech Republic;2. Department of Microelectronics, Czech Technical University in Prague, Technicka 2, 16627 Prague, Czech Republic;3. Department of Physics, National University of Colombia, Carrera 45, No. 26-85, Bogota, Colombia;1. Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Electric and Information Engineering Department, Hunan Institute of Technology, Hengyan, 421002, China;1. Communications and Computer Research Center, Ferdowsi University of Mashhad, Iran;2. Department of Electrical Engineering, Ferdowsi University of Mashhad, Iran |
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| Abstract: | Metal–semiconductor–metal photodetectors (MSM-PDs) are utilized for suitable nano-structured fabrications that can play an important role for the development of future high-speed devices to achieve very high responsivity–bandwidth characteristics. Finite-difference time-domain (FDTD) method is used to calculate the light absorption enhancement factor of nano-grating assisted MSM-PDs near the design wavelength by changing the detector's geometrical parameters in comparison with a conventional device (i.e., without the nano-gratings). The substrates containing the aperture and the nano-gratings are optimized in thickness to trigger an extraordinary optical transmission. Besides, this paper demonstrates how the coupling condition satisfies the oscillating charge densities evolution to the surface plasmon polaritons under illumination of a polarized light and the existence of a band gap in the dispersion curve of surface plasmons propagating on periodically corrugated surfaces. The simulated results confirm that the light absorption enhancement factor of nano-grating assisted MSM-PDs is ～12-times better than the conventional type of MSM-PDs. |
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| Keywords: | FDTD simulation MSM-PDs Nano-grating Subwavelength aperture Surface plasmon polariton |
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