Abstract
Plasmonic structures have increasing applications in optical components and detection. Today, in order to increase the quantum efficiency of metal photocathodes, plasmonic waves are used to provide the confinement conditions and increase the electric field at the surface of the structure. In this research, a gold photocathode with an asymmetric nano-gratting surface is designed as two nano-grooves with different widths and is exposed to photonic radiation. Using FDTD method, the performance of the above photocathode is investigated, and its absorption and reflectance spectra have been calculated. According to the reflection spectrum, the surface plasmon polaritons are excited at their specific wavelengths and reduced the light reflection from the surface of the plasmonic structure. Using this technique, it is possible to create two simultaneous intensities in the reflectance spectrum, which leads to more photon absorption and better selectivity in selecting the desired wavelength or wavelengths. Also, the relative quantum efficiency of nano-gratting photocathodes relative to flat surfaces has been calculated. The results showed that each diagram has two distinct peaks, which are due to the resonance of surface plasmon polaritons and have greatly increased the efficiency compared to the flat surface. Under optimal conditions, the maximum quantum efficiency increased 55 times compared to the flat surface.
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Arabkhorasani, A., Khalilzadeh, J., Dizaji, H.Z. et al. Design and investigation of gold photocathode performance based on asymmetric plasmonic nano-grattings. Opt Quant Electron 54, 594 (2022). https://doi.org/10.1007/s11082-022-03845-y
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DOI: https://doi.org/10.1007/s11082-022-03845-y