Broadband Extraordinary Transmission in a Single Sub-wavelength Aperture

TL;DR

This paper presents a broadband all-dielectric device designed via coordinate transformation to achieve extraordinary transmission through a single sub-wavelength slit, effective from microwave to visible frequencies, with low frequency sensitivity.

Contribution

The paper introduces a novel all-dielectric device for broadband extraordinary transmission using coordinate transformation, verified by FDTD simulations, with improved frequency stability over prior systems.

Findings

Achieves significant transmission increase from 4 GHz to 8 GHz

Demonstrates broadband performance from microwave to visible frequencies

Exhibits very low frequency sensitivity compared to previous systems

Abstract

Coordinate transformation is applied to design an all-dielectric device for Extraordinary Transmission (ET) in a single sub-wavelength slit. The proposed device has a broadband feature and can be applied from microwave to visible frequency bands. Finite-Difference Time-Domain (FDTD) simulations are used to verify the device's performance. The results show that significantly increased transmission is achieved through the sub-wavelength aperture from 4 GHz to 8 GHz when the device is applied. In contrast with previously reported systems, the frequency sensitivity of the new device is very low.