用于先进传感的单谐振腔边界诱导嵌入本征态
Boundary-Induced Embedded Eigenstate in a Single Resonator for Advanced Sensing
摘要：
电磁嵌入本征态，又称连续束缚态（BIC），在传感、激光、增强非线性和能量收集等方面具有巨大的应用潜力。然而，到目前为止，他们的演示仅限于适当定制的元素的大面积周期性阵列，在不可避免的混乱中对整体足迹和性能有根本性的限制。在这项工作中，我们展示了一个BIC本地化在一个单一的亚波长谐振器通过适当地剪裁它周围的边界，使一个新的控制程度的按需对称性破缺。我们通过实验演示了如何边界诱导BIC打开令人兴奋的机会，通过跟踪NaCl在水中的溶解，确定蒸馏水和盐水的蒸发速率，分辨率小于1 e-6 L，使用桌面实验装置的传感。
英文摘要：
Electromagnetic embedded eigenstates, also known as bound states in the continuum (BICs), hold a great potential for applications in sensing, lasing, enhanced nonlinearities and energy harvesting. However, their demonstrations so far have been limited to large-area periodic arrays of suitably tailored elements, with fundamental restrictions on the overall footprint and performance in presence of inevitable disorder. In this work, we demonstrate a BIC localized in a single subwavelength resonator obtained by suitably tailoring the boundaries around it, enabling a new degree of control for on-demand symmetry breaking. We experimentally demonstrate how boundary-induced BICs open exciting opportunities for sensing by tracing the dissolution of NaCl in water, determining evaporation rates of distilled and saltwater with a resolution of less than 1e-6 L using a tabletop experimental setup.
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