We report a new class of optical parametric oscillators, based on a 20-μm-long semiconductor photonic crystal cavity and operating at telecom wavelengths. Because the confinement results from Bragg scattering, the optical cavity contains a few modes, approximately equispaced in frequency. Parametric oscillation is reached when these high-quality-factor modes are thermally tuned into a triply resonant configuration, whereas any other parametric interaction is strongly suppressed. The lowest pump power threshold is estimated to be 50–70 μW. This source behaves as an ideal degenerate optical parametric oscillator, addressing the needs in the field of quantum optical circuits and paving the way towards the dense integration of highly efficient nonlinear sources of squeezed light or entangled photons pairs.

我们报告了一种新型光学参量振荡器，基于 20μm 长的半导体光子晶体腔并在电信波长下工作。由于这种限制是由布拉格散射产生的，因此光学腔包含一些频率近似等距的模式。当这些高质量因数模式被热调谐为三重谐振配置时，就会达到参量振荡，而任何其他参量相互作用都会受到强烈抑制。最低泵浦功率阈值估计为 50–70 μW。该源充当理想的简并光学参量振荡器，满足量子光学电路领域的需求，并为压缩光或纠缠光子对的高效非线性源的密集集成铺平道路。