Opt Lett. 2018 Oct 15;43(20):5114-5117. doi: 10.1364/OL.43.005114.
We report highly collimated radiation from incoherent quantum emitters coupled to photonic dispersion-engineered structures. Two-dimensional free-standing photonic crystal slabs sustained an extremely high density of states for vertically leaky light at discrete frequencies, which results from the constructive interference between directly reflected light and quasi-bound guided modes, referred to as Fano resonance. Electromagnetic simulations showed that an electric dipole that is excited near a photonic crystal slab generates vertically directional radiation at every Fano resonance frequency. The radiation distribution of an electric dipole is strongly correlated with the angular reflectance of a coupled photonic crystal slab. The strategy developed herein will be useful to achieve a vertical beam from quantum emitters such as transition metal dichalcogenide monolayers, facilitating the delivery of light into other external optics.
我们报告了由与光子色散工程结构耦合的非相干量子发射器产生的高度准直辐射。二维自由-standing 光子晶体片在离散频率下支持极高密度的垂直泄漏光态，这是由于直接反射光和准束缚导模之间的建设性干扰，称为 Fano 共振。电磁模拟表明，在光子晶体片附近激发的电偶极子在每个 Fano 共振频率下产生垂直方向的辐射。电偶极子的辐射分布与耦合光子晶体片的角反射率强烈相关。本文提出的策略将有助于实现过渡金属二卤化物单层等量子发射器的垂直光束，从而将光输送到其他外部光学器件。
