论文标题
超鼻子terahertz圆形二色性，由平面支撑性手性准确状态驱动的连续性状态
Ultra-narrowband terahertz circular dichroism driven by planar metasurface supporting chiral quasi bound states in continuum
论文作者
论文摘要
Terahertz（THZ）手性从窄带到宽带进行可定制的操纵。尽管常规的手性受到不可忽略的线宽的限制，并且无法很好地处理窄带。最近，将概念“连续体中的准结合状态”（准BIC）引入到光学共振系统中，其质量因子可能会在超低辐射损失的情况下极高，因此具有超鼻row的线宽，为波浪控制提供了概念可行性。本文中，我们在平面全硅Thz跨表面上构建了准二-BIC，并在平面内C2构建Quasi-bic，并且镜子对称性破裂。这种系统不仅暴露了对称性保护的BIC，而且还暴露了分配给单共振类型的参数调整的BIC。在准BIC频率下获得具有高质量因子（104级）的极狭窄的线宽（低于0.06 GHz），从而实现了超鼻涕的手性。
Terahertz (THz) chirality pursues customizable manipulation from narrowband to broadband. While conventional THz chirality is restricted by non-negligible linewidth and unable to handle narrowband well. Recently, the concept "quasi bound states in continuum" (quasi-BIC) is introduced to optics resonance system whose the quality factor can be extremely high with the ultra-low radiative loss, thus providing a conceptual feasibility for wave control with ultra-narrow linewidth. Herein, we construct quasi-BIC in a planar all-silicon THz metasurface with in-plane C2 and mirror symmetries breaking. Such system not only exposes the symmetry-protected BIC, but also exposes the parameter-tuned BIC assigned to single resonance type. An extremely narrow linewidth (below 0.06 GHz) with high quality factor (104 level) is obtained at quasi-BIC frequency, which achieves the ultra-narrowband THz chirality.
