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Passive all-optical isolator based on spatial self-phase modulation.

Ke-Sheng Lin, Guan-Feng Gao, Yu Gao

|April 15, 2025

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This study introduces a novel all-optical isolator using spatial self-phase modulation (SSPM). This simple device achieves high optical nonreciprocity (ONR) and isolation, paving the way for efficient optical communication and computing applications.

Area of Science:

Photonics and Optics
Nonlinear Optics

Background:

Optical isolators are crucial for unidirectional light propagation in optical communication and computing.
Achieving optical nonreciprocity (ONR) traditionally requires complex methods like magnetic fields or nonlinear effects.
A simple, efficient method for ONR is needed for broader applications.

Purpose of the Study:

To propose and demonstrate a novel, simple all-optical isolator based on spatial self-phase modulation (SSPM).
To validate the theoretical concept through experimental analysis.
To showcase the versatility of the SSPM approach for various photonic applications.

Main Methods:

Theoretical analysis and experimental validation of an all-optical isolator design.
Utilizing spatial self-phase modulation (SSPM) induced by a nonlinear medium.

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Employing a simple optical setup with an aperture, nonlinear medium (ZnSe), and two lenses.

Main Results:

SSPM successfully induces non-reciprocal spatial beam distribution, enabling optical isolation.
The ZnSe-based isolator demonstrated high ONR with 25.1 dB isolation and 2.7 dB insertion loss at 800 nm.
An on-chip isolator design using epsilon-near-zero (ENZ) thin films was successfully developed, showing integration potential.

Conclusions:

The proposed SSPM-based optical isolator is a simple, highly implementable, and efficient solution for ONR.
This versatile approach holds significant promise for commercial and industrial applications in photonics.
The strategy is adaptable for on-chip integration, advancing photonic circuit designs.