由连续域束缚态介导的增强光束偏移
Enhanced beam shifts mediated by Bound States in Continuum
AI总结：
本研究基于角谱分解开发通用理论，揭示了连续域束缚态（BIC）谐振可引发巨大的 Goos-Hanchen 偏移和显著的 Imbert-Fedorov 偏移，并阐明了反射光束因光谱干涉产生畸变与卫星光斑的机制。
摘要：
光束与谐振结构的相互作用促进了用于传感、粒子操控和强光物质相互作用的各种光学平台的发展。在本研究中，我们研究了连续域束缚态（BIC）对特定偏振、以任意角度入射的有限光束的面内和面外偏移（分别称为 Goos-Hanchen (GH) 和 Imbert-Fedorov (IF) 偏移）的表现。基于角谱分解，我们开发了一种通用形式来理解有限光束与具有各向同性和均匀分量的任意分层介质之间的相互作用。它被应用于 p 偏振和圆偏振光的高斯光束入射到包含由间隔层分隔的两个极性介电层的对称结构的情况。对于 p 偏振平面波入射，该结构的一对耦合 Berreman 模式之一最近被证明可以演化为具有无限局域化和发散品质因数的束缚态，并与另一个具有大辐射泄漏的模式共存（Remesh 等人，Optics Communications, 498:127223, 2021）。与理想 BIC 谐振的小偏差仍然提供具有极高品质因数的谐振，本研究利用这些谐振报道了巨大的 GH 偏移。此外，还展示了圆偏振光 IF 偏移的显著增强。此外，反射光束被证明会发生畸变，从而导致一个卫星光斑。这种反射光束分裂的起源被追溯到相应光谱左右两半的破坏性干涉。
英文摘要：
The interaction of light beams with resonant structures has led to the development of various optical platforms for sensing, particle manipulation, and strong light-matter interaction. In the current study, we investigate the manifestations of the bound states in continuum (BIC) on the in plane and out of plane shifts (referred to as Goos-Hanchen (GH) and Imbert-Fedorov (IF) shifts, respectively) of a finite beam with specific polarization incident at an arbitrary angle. Based on the angular spectrum decomposition, we develop a generic formalism for understanding the interaction of the finite beam with an arbitrary stratified medium with isotropic and homogeneous components. it is applied to the case of a Gaussian beam with p and circularly polarized light incident on a symmetric structure containing two polar dielectric layers separated by a spacer layer. For p-polarized plane wave incidence one of the coupled Berreman modes of the structure was recently shown to evolve to the bound state with infinite localization and diverging quality factor coexisting with the other mode with large radiation leakage (Remesh et al. Optics Communications, 498:127223, 2021). A small deviation from the ideal BIC resonance still offers resonances with very high quality factors and these are exploited in this study to report giant GH shifts. A notable enhancement in the IF shift for circularly polarized light is also shown. Moreover, the reflected beam is shown to undergo distortion leading to a satellite spot. The origin of such a splitting of the reflected beam is traced to a destructive interference due to the left and right halves of the corresponding spectra.
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