Non-Reciprocal Response in Silicon Photonic Resonators Integrated with 2D CuCrP2S6 at Short-Wave Infrared

TL;DR

This paper demonstrates a highly efficient, compact non-reciprocal silicon photonic resonator integrated with 2D CuCrP2S6, achieving significant isolation and wavelength splitting in the short-wave infrared spectrum for advanced optical applications.

Contribution

It introduces a novel hybrid CCPS/Si resonator that achieves non-reciprocal response in the SWIR band with low loss and high isolation, operating directly in TE mode without polarization management.

Findings

Achieves 28 dB isolation ratio at 1550 nm

Resonance wavelength splitting of 0.4 nm between directions

Operates over a 100 nm bandwidth in the C-band

Abstract

Achieving non-reciprocal optical behavior in integrated photonics with high efficiency has long been a challenge. Here, we demonstrate a non-reciprocal magneto-optic response by integrating multilayer 2D CuCrP2S6 (CCPS) onto silicon micro ring resonators (MRRs).Under an applied magnetic field, the CCPS intralayer ferromagnetic ordering, characterized by easy-plane magneto-crystalline anisotropy, induces asymmetrical modal responses in the clockwise (CW)and counterclockwise (CCW) light propagation directions. The proposed configuration achieves a low insertion loss of 0.15 dB and a high isolation ratio of 28 dB at 1550 nm. Notably, it exhibits a significant resonance wavelength splitting of 0.4 nm between the counter propagation directions, supporting a 50 GHz optical bandwidth. Operating directly in the transverse electric (TE) mode, it aligns with the main polarization used in silicon photonics circuit, eliminating the need for additional polarization management. The device is ultra-compact, with 2D flake interaction length ranging from 22 um to 55 um and a thickness between 39 nm and 62 nm. Its operation range covers the entire C-band with a bandwidth of up to 100 nm. These attributes make our hybrid CCPS/Si device ideal for advanced non-reciprocal optical applications in the short-wave infrared (SWIR)spectrum, crucial for enhancing the resilience of optical systems against back-reflections.