论文标题
驯服弗里德里希·温特根（Friedrich-Wintgen
Taming Friedrich-Wintgen interference in resonant metasurface: vortex laser emitting at on-demand tilted-angle
论文作者
论文摘要
Friedrich-Wintgen（FW）干扰是一种非典型的耦合机制，可以在非炎热的古典和量子系统中散发泄漏的共振之间损失交换。有趣的是，这种机制使破坏性干扰情景成为可能，在这种情况下，辐射波通过放弃其所有损失而成为连续体（BIC）的结合状态。在这里，我们提出并展示了一个原始的概念，以在光学元表面量身定制FW-BIC作为按需波形的极化奇异性。作为概念验证，将杂化有机无机卤化物钙钛矿作为活性材料，我们赋予了这种新型的极化奇异性，以获得激光发射，在动量空间中以倾斜角度和极化涡流表现出高度方向的发射。我们的结果铺平了通知连贯发射的方式，并定制了极化模式，用于在自由空间，高分辨率成像 /聚焦和数据存储中进行光通信 /操纵中的应用。
Friedrich-Wintgen (FW) interference is an atypical coupling mechanism that grants loss exchange between leaky resonances in non-Hermitian classical and quantum systems. Intriguingly, such an mechanism makes it possible for destructive interference scenario in which a radiating wave becomes a bound state in the continuum (BIC) by giving away all of its losses. Here we propose and demonstrate experimentally an original concept to tailor FW-BICs as polarization singularity at on-demand wavevectors in optical metasurface. As a proof-of-concept, using hybrid organic-inorganic halide perovskite as active material, we empower this novel polarization singularity to obtain lasing emission exhibiting both highly directional emission at oblique angles and polarization vortex in momentum space. Our results pave the way to steerable coherent emission with tailored polarization pattern for applications in optical communication/manipulation in free-space, high-resolution imaging /focusing and data storage.
