Quasi-bound states-driven terahertz molecular fingerprint retriever

IF 4.6 2区 物理与天体物理 Q1 OPTICS
Chenglin Yang , Zhonglei Shen , Donghai Han , Yushan Hou , Xin Ji , Liuyang Zhang , Ruqiang Yan , Xuefeng Chen
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引用次数: 0

Abstract

Limited by the weak resonant intensities of ordinary modes, the sensitivity of terahertz sensing is often insufficient to retreive trace molecular fingerprint features. Here, a quasi-bound states in the continuum-induced terahertz metasurface with high field enhancement is proposed to achieve trace molecular fingerprint sensing. The ratio of radiative loss to intrinsic loss of proposed metasurface can be accurately tailored by controlling in-plane symmetry, enabling working in the under-coupled, critically coupled and over-coupled regions. Based on the proposed metasurface, a pixelated metasensor has been designed for molecular fingerprint reconstruction, where negative, near-zero, and positive signal modulations can be observed in three different coupling regions. Finally, we demonstrate that the designed pixelated metasensor can achieve quantitative sensing of mixtures, providing an alternative technique for detecting and identifying trace molecules.
准结合态驱动的太赫兹分子指纹检索器
受限于普通模式较弱的共振频率,太赫兹传感的灵敏度往往不足以获取痕量分子指纹特征。在此,我们提出了一种具有高场增强功能的连续统诱导太赫兹元表面中的准束缚态,以实现痕量分子指纹传感。通过控制平面内的对称性,可以精确调整所提出的元表面的辐射损耗与本征损耗之比,从而实现在欠耦合、临界耦合和过耦合区域的工作。基于所提出的元表面,我们设计了一种用于分子指纹重建的像素化元传感器,在三个不同的耦合区域可以观察到负信号、近零信号和正信号调制。最后,我们证明了所设计的像素化元传感器可以实现混合物的定量传感,为检测和识别痕量分子提供了另一种技术。
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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