Supersymmetry-enhanced Stark-Chirped Rapid-Adiabatic-Passage in multimode optical waveguides

TL;DR

This paper introduces a novel method combining Stark-Chirped Rapid Adiabatic Passage and Supersymmetry transformations to efficiently excite specific modes in multimode optical waveguides with high fidelity.

Contribution

It presents a new approach that integrates SCRAP and SUSY techniques to control mode excitation in multimode waveguides, achieving over 99% fidelity.

Findings

Achieved over 99% fidelity in mode pumping.

Demonstrated spatial separation of mode superpositions.

Enhanced mode control using SUSY transformations.

Abstract

We propose a method to efficiently pump an excited mode of a multimode optical waveguide starting from a fundamental-mode input by combining Stark-Chirped Rapid Adiabatic Passage (SCRAP) and Supersymmetry (SUSY) transformations. In a two-waveguide set, we implement SCRAP by modulating the core refractive index of one waveguide, which is evanescently coupled to its SUSY partner. SCRAP provides an efficient transfer of light intensity between the modes of different waveguides, while SUSY allows to control which modes are supported. Using both techniques allows to achieve fidelities above 99% for the pumping of the excited mode of a two-mode waveguide. Additionally, we show that SCRAP can be exploited to spatially separate superpositions of fundamental and excited modes, and how SUSY can also improve the results for this application.