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Updated: May 18, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Linear and passive silicon optical isolator.

Chen Wang¹, Xiao-Lan Zhong, Zhi-Yuan Li

¹Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Scientific Reports

|September 21, 2012

Summary

This study demonstrates optical isolation in linear, passive silicon photonic structures. Infrared light transmission was significantly reduced in one direction, achieving high isolation performance without violating physical principles.

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Area of Science:

Photonics and Optical Engineering
Materials Science
Integrated Optics

Background:

On-chip optical isolation is crucial for optical communications and computing.
Controversy exists regarding the possibility of achieving optical isolation using purely linear and passive photonic structures.
Silicon integrated photonics offers a platform for developing advanced optical devices.

Purpose of the Study:

To demonstrate optical isolation of infrared light in linear and passive silicon photonic structures.
To investigate the performance and underlying mechanisms of this optical isolation.
To address the ongoing debate on achieving isolation in reciprocal structures.

Main Methods:

Utilized silicon photonic crystal slab heterojunction diodes.
Conducted numerical simulations to model light propagation.
Performed experimental measurements to validate simulation results.

Main Results:

Achieved optical isolation for in-plane infrared light at around 1,550 nm.
Demonstrated a two-orders-of-magnitude reduction in round-trip transmissivity compared to forward transmissivity.
Observed a usable bandwidth of approximately 50 nm for the optical isolation effect.

Conclusions:

Purely linear and passive silicon photonic structures can effectively achieve optical isolation.
The isolation mechanism is attributed to information dissipation via scattering and selective modal conversion.
The observed phenomenon is consistent with the principles of reciprocity.