Design and investigation of gold photocathode performance based on asymmetric plasmonic nano-grattings

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 re...

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Bibliographic Details
Published in:Optical and quantum electronics 2022-09, Vol.54 (9), Article 594
Main Authors: Arabkhorasani, Ali, Khalilzadeh, Javad, Dizaji, Hossein Zaki, Shahamat, Yadollah
Format: Article
Language:English
Subjects:
Asymmetry
Characterization and Evaluation of Materials
Computer Communication Networks
Efficiency
Electric fields
Electrical Engineering
Flat surfaces
Gold
Grooves
Lasers
Light reflection
Mathematical analysis
Optical components
Optical Devices
Optics
Photocathodes
Photon absorption
Photonics
Physics
Physics and Astronomy
Plasmonics
Polaritons
Quantum efficiency
Reflectance
Selectivity
Surface chemistry
Wavelengths
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Summary: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.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-022-03845-y