# Ultrasensitive micro-scale parity-time-symmetric ring laser gyroscope

## TL;DR

This paper introduces a novel micro-scale ring laser gyroscope leveraging exceptional point physics to significantly enhance sensitivity to low angular rotations, independent of ring size, enabling ultra-sensitive on-chip gyroscopes.

## Contribution

It proposes a new scheme using non-Hermitian degeneracies to improve gyroscope sensitivity, with rotation-induced frequency splitting proportional to the square root of rotation speed.

## Key findings

- Sensitivity to low rotations is enhanced by orders of magnitude.
- Maximum spectral splitting is independent of ring radius.
- Potential for ultra-sensitive, miniaturized on-chip gyroscopes.

## Abstract

We propose a new scheme for ultra-sensitive laser gyroscopes that utilizes the physics of exceptional points. By exploiting the properties of such non-Hermitian degeneracies, we show that the rotation-induced frequency splitting becomes proportional to the square root of the gyration speed- thus enhancing the sensitivity to low angular rotations by orders of magnitudes. In addition, at its maximum sensitivity limit, the measurable spectral splitting is independent of the radius of the rings involved. Our work paves the way towards a new class of ultra-sensitive miniature ring laser gyroscopes on chip.

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Source: https://tomesphere.com/paper/1704.03000