Adaptive control of necklace states in a photonic crystal waveguide

TL;DR

This paper introduces an adaptive holographic technique to reversibly control localized resonances in photonic crystal waveguides, enabling dynamic formation and disruption of high-transmission necklace states crucial for quantum networks and signal processing.

Contribution

The paper presents a novel adaptive method to control Anderson-localized modes in photonic crystal waveguides by locally modifying the refractive index, allowing dynamic management of necklace states.

Findings

Reversible control of localized resonances achieved.

Dynamic formation and breaking of necklace states demonstrated.

Potential for improved quantum photonic networks shown.

Abstract

Resonant cavities with high quality factor and small mode volume provide crucial enhancement of light-matter interactions in nanophotonic devices that transport and process classical and quantum information. The production of functional circuits containing many such cavities remains a major challenge as inevitable imperfections in the fabrication detune the cavities, which strongly affects functionality such as transmission. In photonic crystal waveguides, intrinsic disorder gives rise to high-Q localized resonances through Anderson localization, however their location and resonance frequencies are completely random, which hampers functionality. We present an adaptive holographic method to gain reversible control on these randomly localized modes by locally modifying the refractive index. We show that our method can dynamically form or break highly transmitting necklace states, which is an essential step towards photonic-crystal based quantum networks and signal processing circuits.