Easily tunable long photonic hook generated from Janus liquids-filled hollow microcylinder

TL;DR

This paper introduces a novel hollow microcylinder with Janus liquids that generates a long, tunable photonic hook whose properties can be controlled by rotation or incident angle, enabling flexible beam shaping.

Contribution

The study presents a new structure combining a hollow microcylinder and Janus liquids to produce easily tunable, long photonic hooks with adjustable properties.

Findings

Achieved a photonic hook with decay length ~18λ

Generated a photonic hook with focal distance ~8λ

Demonstrated control of photonic hook properties via rotation and incident angle

Abstract

The photonic hook, a beam that can propagate along a curved path, has attracted wide attention since its inception and experimental confirmation. In this paper, we propose a new type of structure, which was made by a hollow microcylinder and a Janus-shaped liquid column of two insoluble filling liquids, for producing photonic hook of easily tunable properties and long length. The E^2 field intensity distribution characteristics and formation mechanism of the photonic hook are studied by analyzing the energy flow using the finite element method. The profile and properties of the photonic hook can be effectively tuned by rotating the hollow microcylinder or changing the light incident angle. A long photonic hook with a decay length of ~18{\lambda} and a photonic hook with a large focal distance ~8{\lambda} are obtained by this model.