近日，荷兰纳米光子学中心教授Rodriguez, S. R. K.团队研究了钙钛矿腔内连续波非线性极化控制及临界特征。相关论文于2025年5月27日发表在《自然—光子学》杂志上。
卤化物钙钛矿已成为基础物理研究和技术应用的有前景的光子材料。它们在非线性光学方面的潜力也引起了人们的极大兴趣。然而，到目前为止，连续波（CW）非线性仍然难以捉摸。研究组演示了CsPbBr3钙钛矿腔中的CW非线性现象。
他们首先证明了光学双稳性，这是单模相干非线性光学的标志。接下来，利用非线性和双折射的相互作用来演示对光偏振的非线性控制。最后，通过测量该腔的光学滞后随温度的变化，发现非线性在65℃左右显著增强 K，这可以指示CsPbBr3中的相变。该研究结果将CsPbBr3腔定位为非线性光学的合适平台，提供强大且可调的CW非线性和双折射。此外，研究组通过光学滞后测量揭示物质相变特征的方法有望探索光-物质系统的强相关状态。
附：英文原文
Title: Continuous-wave nonlinear polarization control and signatures of criticality in a perovskite cavity
Author: Keijsers, G., de Boer, R. M., Verdonschot, B., Peters, K. J. H., Geng, Z., Rodriguez, S. R. K.
Issue&Volume: 2025-05-27
Abstract: Halide perovskites have emerged as promising photonic materials for fundamental physics studies and technological applications. Their potential for nonlinear optics has also drawn great interest. Yet, so far, continuous-wave (CW) nonlinearities have remained elusive. Here we demonstrate CW nonlinear phenomena in a CsPbBr3 perovskite cavity. We first demonstrate optical bistability, the hallmark of single-mode coherent nonlinear optics. Next, we exploit the interplay of nonlinearity and birefringence to demonstrate nonlinear control over the polarization of light. Finally, by measuring the optical hysteresis of our cavity as a function of temperature, we find a dramatic enhancement of the nonlinearity around 65K, which may indicate a phase transition in CsPbBr3. Our results position CsPbBr3 cavities as a suitable platform for nonlinear optics, offering strong and tuneable CW nonlinearity and birefringence. Moreover, our approach to uncover signatures of a phase transition of matter via optical hysteresis measurements is promising for exploring strongly correlated states of light–matter systems.
DOI: 10.1038/s41566-025-01692-3
Source: https://www.nature.com/articles/s41566-025-01692-3