Reentrant delocalization transition in one-dimensional photonic quasicrystals

TL;DR

This paper predicts and demonstrates a reentrant delocalization transition of light in 1D photonic quasicrystals, revealing complex localization behavior influenced by quasiperiodic modulation strength.

Contribution

It introduces the concept of a reentrant delocalization transition in photonic quasicrystals and models it with a dimerized tight-binding approach.

Findings

Experimental observation of reentrant transition

Theoretical prediction of second delocalization transition

Modeling with long-range coupled tight-binding system

Abstract

Waves propagating in certain one-dimensional quasiperiodic lattices are known to exhibit a sharp localization transition. We theoretically predict and experimentally observe that the localization of light in one-dimensional photonic quasicrystals may be followed by a second delocalization transition for some states on increasing quasiperiodic modulation strength - an example of a reentrant transition. We further propose that this phenomenon can be qualitatively captured by a dimerized tight-binding model with long-range couplings.