Simulation of photodetection using finite-difference time-domain method with application to near-field subwavelength imaging based on nanoscale semiconductor photodetector array

TL;DR

This paper presents a finite-difference time-domain simulation method to analyze the performance of nanoscale semiconductor photodetectors for near-field subwavelength imaging, revealing a resolution about one-tenth of the wavelength.

Contribution

It introduces a multi-level multi-electron FDTD simulation approach to evaluate optical power coupling and resolution in nanoscale photodetector arrays for imaging.

Findings

Detection resolution is approximately one-tenth of the wavelength.

Power coupling between adjacent pixels affects imaging resolution.

Simulation results are comparable to near-field scanning optical microscopes.

Abstract

Simulation of detecting photoelectrons using multi-level multi-electron (MLME) finite-difference time-domain (FDTD) method with an application to near-field subwavelength imaging based on semiconductor nanophotodetector (NPD) array is reported. The photocurrents from the photodiode pixels are obtained to explore the resolution of this novel NPD device for subwavelength imaging. One limiting factor of the NPD device is the optical power coupling between adjacent detector pixels. We investigate such power coupling in the presence of absorbing media as well as the spatial distributions of the electric field and photoelectron density using the MLME FDTD simulation. Our results show that the detection resolution is about one tenth of the operating wavelength, which is comparable to that of a near-field scanning optical microscope based on metal clad tapered fiber.