Bloch wavepacket control in truncated modulated optical lattices

TL;DR

This paper investigates how to control the reflection and transmission of Bloch wavepackets in modulated optical lattices by tuning modulation parameters, enabling complete reflection at specific resonant frequencies.

Contribution

It demonstrates a method to control wavepacket reflection in optical lattices through modulation tuning, revealing conditions for complete reflection due to inhibited tunneling.

Findings

Reflection can be controlled by tuning modulation frequency and depth.

Complete reflection occurs at resonant frequencies where tunneling is inhibited.

Energy flow between transmitted and reflected waves can be precisely managed.

Abstract

We study the reflection of Bloch wavepackets at the interface of optical lattice possessing a shallow longitudinal out-of-phase refractive index modulation in adjacent waveguides. We show that the relation between the transmitted and reflected energy flows can be efficiently controlled by tuning the frequency and the depth of the modulation. Thus, complete beam reflection may be achieved for a set of resonant modulation frequencies at which light tunneling between adjacent guides of modulated lattice is inhibited.