Cerjan Alexander, Hsu Chia Wei, Rechtsman Mikael C
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA.
Phys Rev Lett. 2019 Jul 12;123(2):023902. doi: 10.1103/PhysRevLett.123.023902.
We propose a new paradigm for realizing bound states in the continuum (BICs) by engineering the environment of a system to control the number of available radiation channels. Using this method, we demonstrate that a photonic crystal slab embedded in a photonic crystal environment can exhibit both isolated points and lines of BICs in different regions of its Brillouin zone. Finally, we demonstrate that the intersection between a line of BICs and a line of leaky resonances can yield exceptional points connected by a bulk Fermi arc. The ability to design the environment of a system opens up a broad range of experimental possibilities for realizing BICs in three-dimensional geometries, such as in 3D-printed structures and the planar grain boundaries of self-assembled systems.
我们提出了一种新的范式，通过设计系统环境来控制可用辐射通道的数量，从而实现连续统中的束缚态（BICs）。利用这种方法，我们证明了嵌入光子晶体环境中的光子晶体平板在其布里渊区的不同区域可以表现出孤立的BIC点和线。最后，我们证明了一条BIC线与一条泄漏共振线的交点可以产生由体费米弧连接的例外点。设计系统环境的能力为在三维几何结构中实现BICs开辟了广泛的实验可能性，例如在三维打印结构和自组装系统的平面晶界中。
