Ever since the advent of nonlinear optics, the generation of light by frequency-conversion is drawing continued attention, and leading to emerging applications such as supercontinuum sources for ultra stable clocks and advanced microscopy. A modern approach to frequency-conversion is to switch light confined in micro- and nanocavity resonances to enable on-chip operation. Supposedly, nonlinear frequency conversion in such confined media differs from traditional non-linear optics in three key features regarding output spectrum, frequency shift, and critical time scale. Therefore, we switch GaAs-AlAs microcavities by the electronic Kerr effect, and study a range of quality factors to bridge the confined and the traditional non-linear regimes. We uncover the key role of the density of vacuum fluctuations, i.e., the local density of optical states (LDOS) for newly generated frequencies, a concept inspired by cavity quantum electrodynamics (cQED). As a result, we succeed to establish a framework, which not only describes nonlinear optics both in traditional bulk and in confined media but also opens a new control dimension in changing the color of light.
Record nonlinear conversion efficiency in the production of high spectral purity vacuum ultraviolet laser at 148 nm
IPG Photonics Corporation（IPG光子公司）；JILA, NIST and University of Colorado, Department of Physics, University of Colorado（JILA、美国国家标准与技术研究院和科罗拉多大学物理系，科罗拉多大学）；CREOL, The College of Optics and Photonics（CREOL光学与光电子学院）
Quench, Glow, or Stay Silent: Distance-Controlled Up-Conversion Emission near Metallic Nanowires
Nicolaus Copernicus University in Toruń（托伦哥白尼大学）；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、勃艮第跨学科卡诺实验室）；Institute of Physical Chemistry Polish Academy of Sciences（波兰科学院物理化学研究所）；Wroclaw University of Science and Technology（弗罗茨瓦夫科技大学）
