湖南师范大学匡乐满团队通过二次光-力耦合实现高灵敏度的温度传感。相关论文于2025年6月12日发表在《物理评论A》杂志上。

机械谐振器的有效频率可以通过二次光机（QOM）耦合引起的弹簧效应来调节，QOM系统中预测了自发对称破缺和反奇偶时间相变。研究组表明，通过用强外部光场驱动QOM系统，可以显著提高机械敏感性，并且当驱动强度接近自发对称破缺的临界点（CP）时，会发生发散。 

基于CP，研究组提出了一种高灵敏度的温度传感器，其机械谐振器与光学模式二次耦合。结果发现，随着驱动强度接近CP，温度传感器的灵敏度可以提高几个数量级，并且在低温极限下温度传感器的敏感性仍然很高。该工作为在QOM系统中实现超低温下的高灵敏度温度传感提供了一种有效的方法。

附：英文原文

Title: Highly sensitive temperature sensing via quadratic optomechanical coupling

Author: Yu-Sheng Tang, Xun-Wei Xu, Jie-Qiao Liao, Hui Jing, Le-Man Kuang

Issue&Volume: 2025/06/12

Abstract: The effective frequency of a mechanical resonator can be tuned via the spring effect induced by quadratic optomechanical (QOM) coupling, and both spontaneous symmetry breaking and anti-parity-time phase transition were predicted in the QOM systems. Here, we show that the mechanical susceptibility can be enhanced significantly by driving the QOM system with a strong external optical field, and divergence will happen as the driving strength approaches the critical point (CP) for spontaneous symmetry breaking. Based on the CP, we propose a highly sensitive temperature sensor with a mechanical resonator quadratically coupled to an optical mode. We find that the sensitivity of the temperature sensor can be enhanced by several orders of magnitude as the driving strength approaches the CP, and the sensitivity of the temperature sensor remains high in the low-temperature limit. Our work provides an effective way to realize highly sensitive temperature sensing at ultralow temperature in QOM systems.

DOI: 10.1103/1f8d-44ym

Source: https://journals.aps.org/pra/abstract/10.1103/1f8d-44ym