Klein tunneling of light in fiber Bragg gratings

TL;DR

This paper proposes a photonic analogue of Klein tunneling in fiber Bragg gratings, demonstrating how light pulses can pass through potential barriers, with potential applications in optical communications and photonic devices.

Contribution

It introduces a novel optical analogue of Klein tunneling using nonuniform fiber Bragg gratings with embedded chirped regions, expanding the understanding of relativistic quantum phenomena in photonics.

Findings

Transmission window opens inside the stop band with chirp

Klein tunneling observed at chirp lengths comparable to the Compton wavelength

Potential for new optical device functionalities

Abstract

A photonic analogue of Klein tunneling (KT), i.e. of the exotic property of relativistic electrons to pass a large repulsive and sharp potential step, is proposed for pulse propagation in a nonuniform fiber Bragg grating with an embedded chirped region. KT can be simply observed as the opening of a transmission window inside the grating stop band, provided that the impressed chirp is realized over a length of the order of the analogue of the Compton wavelength.