Terahertz metal metasurface sensor based on bound state in continuum

The invention discloses a continuum bound state-based terahertz metal metasurface sensor, which is formed by periodically arranging a plurality of square metal metasurface units with the same structure, and is characterized in that each metal metasurface unit comprises a dielectric layer at the bottom, and a metal resonator layer covers the dielectric layer; the metal resonator layer is composed of a large resonant ring and a small resonant ring. When the to-be-detected object is arranged on the metasurface, the resonance frequency of the transmission spectrum of the metasurface can generate corresponding frequency shift, and the attribute of the to-be-detected object can be obtained by detecting the frequency shift degree of the resonance frequency. 本发明公开了一种基于连续体中束缚态的太赫兹金属超表面传感器，包括由多个结构相同的正方形金属超表面单元周期排列构成，金属超表面单元包括底层的介质层，介质层上覆盖有金属共振器层，金属共振器层由大谐振环和小谐振环构成。本发明当超表面上有待测物时，其透射谱的共振频率会发生相应频移，通过检测共振频率的频移程度，即可获得所加待测物的属性。