用于手性分子浓度传感和异构体识别的偏振分辨太赫兹超表面传感器

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-04 DOI:10.1063/5.0270860

Yu He, Youwei Qiu, Mengxiang Wan, Wan Li, Tingting Tang, Li Luo, Jie Li, Peng Li, Xueguang Lu, Wanxia Huang, Jianquan Yao

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引用次数: 0

摘要

提出了一种基于超表面的太赫兹偏振传感方法，用于手性分子浓度和异构体的高灵敏度识别。通过设计螺旋方形环结构的超表面传感器，并将其与聚乙烯醇-脯氨酸薄膜涂层结合，利用太赫兹偏振分辨时域光谱系统提取样品的圆二色性和光旋信号。实验结果表明，该超表面显著提高了手性信号检测灵敏度（4.57 GHz/(μg/cm2)），其优值（0.0354 cm2/μg）优于以往的环形结构传感器。进一步分析表明，不同手性分子（D/ l -脯氨酸）的极化椭圆角和极化旋转角表现出不同的特征。该方法为太赫兹辐射中超弱手性信号的精确检测提供了一种策略。

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Polarization-resolved terahertz metasurface sensor for concentration sensing and isomer recognition of chiral molecules

The paper presents a terahertz polarization sensing method based on a metasurface for concentration and isomer recognition of chiral molecules with high sensitivity. By designing a metasurface sensor with a spiral square ring structure and combining it with a polyvinyl alcohol-proline thin film coating, the circular dichroism and optical rotation signals of the sample are extracted using a terahertz polarization-resolved time-domain spectroscopy system. The experimental results show that the metasurface significantly improves the chiral signal detection sensitivity (4.57 GHz/(μg/cm2)), and its figure of merit (0.0354 cm2/μg) is superior to previous ring structure sensors. Further analysis shows the polarization ellipse angle and polarization rotation angle of different chiral molecules (D/L-proline) exhibit differentiated characteristics. This method provides a strategy for the precise detection of ultra-weak chiral signals in the terahertz radiation.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.