Lossless broadband adiabatic polarizing beam splitting in a plasmonic system

TL;DR

This paper presents a broadband, lossless, polarization beam splitter using a plasmonic system and STIRAP technique, enabling new integrated optical devices with wide bandwidth and low loss.

Contribution

It introduces a novel broadband integrated PBS design employing STIRAP in a plasmonic system, achieving wide bandwidth and near-lossless operation.

Findings

>250 nm TM bandwidth with <-40 dB extinction

>150 nm TE bandwidth with <-20 dB extinction

Near-lossless light transfer despite plasmonic losses

Abstract

The intriguing analogy between quantum physics and optics has inspired the design of unconventional integrated photonics devices. In this paper, we numerically demonstrate a broadband integrated polarization beam splitter (PBS) by implementing the stimulated Raman adiabatic passage (STIRAP) technique in a three-waveguide plasmonic system. Our proposed PBS exhibits >250 nm TM bandwidth with <-40 dB extinction and >150 nm TE bandwidth with <-20 dB extinction, covering the entire S-, C- and L-band and partly E-band. Moreover, near-lossless light transfer is achieved in our system despite the incorporation of a plasmonic hybrid waveguide because of the unique loss mitigating feature of the STIRAP scheme. Through this approach, various broadband integrated devices that were previously impossible can be realized, which will allow innovation in integrated optics.