Improved superlensing in two-dimensional photonic crystals with a basis

TL;DR

This paper demonstrates how two-dimensional photonic crystals can be engineered with complex bases to enhance superlensing capabilities, achieving subwavelength focusing at fixed frequencies.

Contribution

It introduces a systematic method to improve superlensing resolution in photonic crystals by using a hierarchy of structures with increasingly complex bases.

Findings

Crystals focus light with subwavelength resolution.

Resolution can be increased without changing frequency.

Hierarchy of crystal structures enhances focusing performance.

Abstract

We study propagation of light in square and hexagonal two-dimensional photonic crystals. We show, that slabs of these crystals focus light with subwavelength resolution. We propose a systematic way to increase this resolution, at an essentially fixed frequency, by employing a hierarchy of crystals of the same structure, and the same lattice constant, but with an increasingly complex basis.