发表机构
Université Bourgogne Europe, CNRS, Laboratoire Interdisciplinaire Carnot de Bourgogne ICB UMR 6303（勃艮第欧洲大学、法国国家科学研究中心、科多尔跨学科卡诺实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在光纤中完整观测到模拟黑洞光环共振，通过推广光子球概念至非平稳系统，并在5公里色散位移光纤实验中验证了理论预测，建立了黑洞光环、时空焦散与准正则模式光谱的直接实验联系。
AI 中文摘要
我们在光学模拟中完整观测到了黑洞光环共振。为此，我们将光子球的概念推广到非平稳系统，证明光环与时空焦散相关联，且其复频率由该焦散的传播和发散决定。对于作为模拟黑洞势的光学孤子，我们预测了一个特征光谱平台，其边界由光环频率的实部设定，而其光谱衰减由虚部控制。利用在5公里长的色散位移光纤中进行的泵浦-探测实验，我们在两种不同的泵浦波长下观测到了这些特征。测量到的光谱与数值模拟及预测的光环模式分布一致，从而直接获取了共振的振荡和衰减特性。我们的结果在色散模拟系统中建立了黑洞光环、时空焦散和准正则模式光谱之间的直接实验联系。
英文摘要
We demonstrate the complete observation of a black-hole lightring resonance in an optical analogue. To do so, we generalize the concept of the photon sphere to non-stationnary systems by showing that the lightring is associated to a spatiotemporal caustic and that its complex frequency is determined by the propagation and divergence of this caustic. For an optical soliton acting as an analogue black-hole potential, we predict a characteristic spectral plateau whose boundaries are set by the real part of the lightring frequency, while its spectral decay is governed by the imaginary part. Using a pump-probe experiment in a 5-km-long dispersion-shifted fiber, we observe these signatures for two distinct pump wavelengths. The measured spectra agree with numerical simulations and with the predicted lightring-mode profile, providing direct access to both the oscillatory and decay properties of the resonance. Our results establish a direct experimental connection between black-hole lightrings, spacetime caustics, and quasinormal-mode spectroscopy in a dispersive analogue system.
Comments5+4 pages, 4+2 figures. Comments are welcome
