Electrically controlled Bragg resonances of an ambichiral electro-optic structure: oblique incidence

TL;DR

This paper investigates how an applied electric field influences Bragg resonances in ambichiral electro-optic structures under oblique incidence, revealing angle-dependent blueshifts unaffected by electric field polarity.

Contribution

It provides a detailed analysis of the Pockels effect on Bragg resonances in ambichiral structures with oblique incidence, including a solvable boundary-value problem formulation.

Findings

Bragg resonance peaks blueshift with increasing incidence angle

Blueshifts are independent of the electric field sign

The study offers a computational approach for such electro-optic structures

Abstract

The Pockels effect can increase the effective birefringence of ambichiral, electro--optic rejection filters made of materials with a $\bar{4}2m$ point group symmetry, when a dc electric field is applied parallel to the axis of nonhomogeneity. The reflectances and the transmittances of such an ambichiral structure for obliquely incident plane waves is solvable through a boundary-value problem that is formulated using the frequency-domain Maxwell equations, the constitutive equations that contain the Pockels effect, and standard algebraic techniques for handling 4x4 matrix ordinary differential equations. The Bragg resonance peaks, for different circular-polarized-incidence conditions, blueshift as the angle of incidence increases. These blueshifts are unaffected by the sign of the dc electric field.