Photonic Hook with Modulated Bending Angle Formed by Using Triangular Mesoscale Janus Prisms

TL;DR

This paper introduces a novel design of triangular mesoscale Janus prisms that generate long, highly bendable photonic hooks with tunable angles and sub-diffraction widths, useful for advanced optical applications.

Contribution

The study proposes a new micro-prism design and demonstrates how to control photonic hook properties via numerical simulations, advancing optical manipulation techniques.

Findings

Photonic hooks with large bending angles are achieved.

The length and bending angle are tunable by adjusting prism spacing.

Narrow photonic hooks beyond the diffraction limit are realized.

Abstract

In this study, we propose a novel design of the triangular mesoscale Janus prisms for the generation of the long photonic hook. The numerical simulations based on the finite-difference time-domain method are used to examine the formation mechanism of the photonic hook. The electric intensity distributions near the micro-prisms are calculated for operating at different re-fractive indices and spaces of the two triangular micro-prisms. The asymmetric vortexes of in-tensity distributions result in the long photonic hook with large bending angle. The length and the bending angle of the photonic hook are efficiently modulated by changing the space be-tween the two triangular micro-prisms. Moreover, the narrow width of the photonic hook is achieved beyond the diffraction limit. The triangular Janus micro-prisms have high potential for practical applications in optical tweezers, nanoparticle sorting and manipulation and photonic circuits.