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This study simulates evanescent wave detection using a silicon Schottky diode for enhanced Near-field Scanning Optical Microscopy (NSOM) resolution. Polarization

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Area of Science:

  • Optoelectronics
  • Nanophotonics
  • Scanning Probe Microscopy

Background:

  • Near-field Scanning Optical Microscopy (NSOM) traditionally relies on detecting evanescent waves.
  • Previous simulations used Finite Elements Method (FEM) and 2D models of silicon Schottky diodes with subwavelength apertures.
  • Enhanced resolution in NSOM is crucial for advanced imaging applications.

Purpose of the Study:

  • To investigate the influence of optical polarization on evanescent wave detection in NSOM.
  • To explore the potential of a silicon Schottky diode photodetector for super-resolved spatial-temporal readout.
  • To advance photodetector design for Time-Spectral based Polarization-Encoding in NSOM.

Main Methods:

  • Simulated a silicon Schottky diode photodetector with a truncated trapezoid shape and subwavelength pinhole aperture.
  • Conducted 2D advanced simulations using the Finite Elements Method (FEM).
  • Performed electrical and electro-optical simulations, including horizontal scanning across a Gaussian beam with projected E-field modes.

Main Results:

  • Demonstrated the feasibility of detecting evanescent waves with a specialized silicon Schottky diode.
  • Showcased the impact of polarization on the detection process.
  • Validated the simulation model for predicting device performance.

Conclusions:

  • The developed photodetector design shows promise for next-generation NSOM systems.
  • Results support the potential for Time-Spectral based Polarization-Encoding for Spatial-Temporal Super-Resolved NSOM Readout.
  • This research paves the way for fabricating advanced photodetector devices for high-resolution optical microscopy.