Controlling Interface States in 1D Photonic Crystals by tuning Bulk Geometric Phases

TL;DR

This paper demonstrates a method to control interface states in 1D photonic crystals by engineering geometrical phases, verified through experiments, enabling potential applications in nonlinear optics, sensing, and lasing.

Contribution

It introduces a novel approach to control interface states in 1D photonic crystals via bulk geometric phase tuning, without requiring defects.

Findings

Experimental verification of interface states in multilayered photonic crystals.

Good agreement between measured and theoretical geometrical phases.

Potential for designing photonic devices for nonlinear optics, sensing, and lasing.

Abstract

Interface states in photonic crystals usually require defects or surface/interface decorations. We show here that one can control interface states in 1D photonic crystals through the engineering of geometrical phase such that interface states can be guaranteed in even or odd, or in all photonic bandgaps. We verify experimentally the designed interface states in 1D multilayered photonic crystals fabricated by electron beam vapor deposition. We also obtain the geometrical phases by measuring the reflection phases at the bandgaps of the PCs and achieve good agreement with the theory. Our approach could provide a platform for the design of using interface states in photonic crystals for nonlinear optic, sensing, and lasing applications