Atomically-Thin Tsumoite (BiTe) based All-Photonic-Isolator, Information Converter, and Logic-Gate

TL;DR

This paper investigates the nonlinear optical properties of 2D BiTe, demonstrating its potential for advanced photonic devices like isolators, converters, and logic gates through experimental and theoretical analysis.

Contribution

It provides a comprehensive analysis of BiTe's third-order nonlinear response and designs novel photonic devices leveraging its strong nonlinear properties.

Findings

BiTe exhibits high third-order nonlinear susceptibility comparable to or exceeding other 2D materials.

The study demonstrates a BiTe-based photonic isolator, information converter, and logic gate.

Band dispersion and carrier transport are directly linked to nonlinear optical responses.

Abstract

Two-dimensional tsumoite (BiTe), a polymorph of Bi2Te3, has emerged as a promising candidate for nonlinear photonic devices owing to its strong spin-orbit coupling, tunable bandgap, and high carrier mobility characteristics. This work presents a thorough examination of the third-order nonlinear optical response of BiTe dispersions using spatial self-phase modulation (SSPM) spectroscopy. The nonlinear refractive index (n2) and third-order nonlinear susceptibility are quantitatively derived from the diffraction ring patterns, demonstrating third-order nonlinear susceptibility values, similar to or surpassing those of advanced 2D materials. The temporal development and distortion of the SSPM rings are examined using the wind-chime model, and thermal factors influencing the SSPM pattern are analyzed. First-principles electronic band structure studies reveal that the elevated nonlinear susceptibility arises from band dispersion. Direct correlation between carrier transport and third-order nonlinear susceptibility is established. Utilizing these qualities, all photonic devices, including a photonic isolator based on a 2D BiTe-2D hBN heterostructure, are depicted to show asymmetric propagation. A photonic information converter and a logic gate are designed using the cross-phase modulation technique. These findings establish 2D BiTe nanostructure as a formidable nonlinear optical platform for advanced photonic signal processing and integrated photonic applications.