Semi-analytical design of antireflection gratings for photonic crystals

TL;DR

This paper introduces a semi-analytical method for designing antireflection gratings on photonic crystal surfaces, effectively reducing reflection losses across various angles of incidence.

Contribution

A new semi-analytical design algorithm for wide-angle antireflection gratings on photonic crystals is proposed, improving upon existing methods.

Findings

The algorithm effectively reduces reflection across a broad range of angles.

Examples demonstrate the advantages of the proposed design.

Limitations of the method are discussed.

Abstract

This article concerns the design of antireflection structures which, placed on a photonic crystal surface, significantly diminish the fraction of energy lost to reflected waves. After a review of the classes of these structures proposed to date, a new method is presented in detail for the design of antireflection gratings operating in a wide range of angles of incidence. The proposed algorithm is illustrated by means of several examples, showing the advantages and limitations.