Inverse design of resonant nanostructures for extraordinary optical transmission of periodic metallic slits

TL;DR

This paper introduces an inverse design method using topology optimization to create nanostructures that enhance optical transmission through metallic slits, allowing precise control over resonant frequencies.

Contribution

It presents a novel inverse design approach for nanostructures that achieve targeted optical transmission properties, extending to wavelength insensitivity and future 3D applications.

Findings

Designed nanostructures with specified transmission peaks

Achieved control over red/blue shift of resonant peaks

Extended method to wavelength-insensitive structures

Abstract

This paper has presented inversely determining the resonant configuration of the bilateral nanostructures for periodic metallic slits with extraordinary optical transmission performance. The topology optimization approach is utilized to implement the inverse design procedure. Several geometrical configurations of the bilateral nanostructures are derived for periodic metallic slits. The resonant performance of the derived nanostructures are demonstrated by the transmission spectra, where the transmission peak is presented at the specified wavelength in the inverse design procedure. This provides an approach to control the red or blue shift of the transmission peak or localize the resonant performance at a desired frequency, by specifying the desired incident wavelength in the inverse design procedure. The inverse design method is extended to make the periodic metallic slits to be less sensitive to the incident wavelength. This research can be further extended to inversely find the resonant subwavelength structures for extraordinary optical absorption and other surface palsmon polariton based photonic devices. The inverse design of three dimensional apertures for extraordinary optical transmission will be investigated in our future researches.