Adjustable terahertz chiral discrimination device and adjustable circular polarization selector

Abstract

The invention provides an adjustable terahertz chiral identification device and an adjustable circular polarization selector. The identification device includes: a metal pattern layer, a dielectric layer and a metal layer; the dielectric layer is on the side of the metal layer, and the metal pattern layer is on the On the other side; the metal pattern layer includes metal pattern units arranged periodically, including a set metal pattern, including a plurality of metal strips; the second is parallel to the first side; the third is parallel to the second side away from the first; The third and the second are connected by the fourth, and the fourth is away from the side of the third and is flush with the end of the first; one end of the third is bent vertically to the first to form the fifth, and the fifth is far away from the end of the third and The second is flush with the side of the first, and the fifth side is flush with the end of the first; the length between the third and the fourth is not less than the length between the second and the second; the second is far away from the first The ends of the four are connected with strip-shaped phase-change substances. Through the above scheme, the purpose of flexible identification and circular polarization selection of different terahertz chiral molecules can be achieved.

Description

technical field [0001] The invention relates to the technical field of terahertz devices, in particular to an adjustable terahertz chiral discrimination device and an adjustable circular polarization selector. Background technique [0002] In the infrared and visible light bands, measuring the circular dichroism (abbreviated as CD) properties of chiral molecules has become an important method for biological and chemical research on chiral materials. However, due to the relatively high energy of the light frequency, the excited response comes from the transition of molecular electronic states, while the interaction between terahertz waves and materials involves the rotation and vibration energy levels of biomacromolecules. The corresponding terahertz electromagnetic response and molecular The overall structure is more correlated. Therefore, theoretically speaking, measuring the polarization response of chiral molecules in the terahertz band is expected to be an effective mea...

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Problems solved by technology

[0003] In the prior art, terahertz chiral discrimination devices with three-dimensional helical structures or metal pillars in the middle can produce strong circular dichroism spectra. However, these structures are complicated to prepare in the terahertz frequency range, which is not conducive to practical applications. In addition, this Once the structural sensor is processed, its performance is fixed, which greatly limits the flexibility of the device

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