All-dielectric metasurfaces offer unconventional optical functional behaviors for manipulating light, due to the strong localization of light with negligible dissipative loss. Here, we propose a compact design for a light emission cavity consist of an all-dielectric grating reflector and an all-dielectric symmetry-breaking metasurface supporting “dark” mode. The “dark” mode of the asymmetric metasurface structure results in high quality factor, and the broadband perfect reflector leads to directional emission. We present a theoretical study of the spectral characterization of the emission cavity, and the emission property of the nanocavity embedded with gain medium is investigated by a Maxwell-Bloch Langevin approach. Strong luminescence enhancement with directive light emission and reduced lasing threshold are observed. Our observations offer enormous potential in controlling light emission and provides an essential step for developing efficiency and directionality LEDs, and ultra-compact lasers.

中文翻译：

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基于全介电质子面的高质量高质量紧凑型单向激光器

全电介质超表面为操纵光提供了非常规的光学功能行为，这是由于光的强局部性以及可忽略的耗散损耗。在这里，我们提出了一种紧凑的发光腔设计，该结构由全介电光栅反射器和支持“暗”模式的全介电对称破坏超表面组成。不对称的超表面结构的“暗”模式导致高品质因数，而宽带完美反射器会导致定向发射。我们目前对发射腔的光谱表征进行理论研究，并通过麦克斯韦-布洛赫·朗格文（Maxwell-Bloch Langevin）方法研究了嵌入增益介质的纳米腔的发射特性。观察到具有定向发光的强发光增强和降低的激光阈值。