High-performance mid-infrared fingerprint detection and solution sensing based on quasi-bound states in the continuum

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-09-21 DOI:10.1016/j.optcom.2025.132499

Cong Chen , Junyi Liu , Xiaoshan Liu , Guiqiang Liu , Guolan Fu , Jing Chen , Wei Du , Chaojun Tang , Juan Deng , Zhengqi Liu

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引用次数: 0

Abstract

All-dielectric metasurfaces have become a popular platform for mid-infrared molecular fingerprint detection. However, since the absorption rate of the two-port leaky mode system can only reach a maximum of 0.5, this limits the contrast of the absorbed signal. In this work, we propose an all-dielectric quasi-bound states in the continuum (quasi-BIC) metasurface and realize mid-infrared molecular fingerprint detection based on the extinction coefficient of the substances being detected on the transmission of quasi-BIC. Using boron carbide (B₄C) as an example, we successfully measure its mid-infrared molecular fingerprint spectrum and achieve satisfactory results within nm-scale films. Additionally, it also demonstrates excellent sensing performance, with a sensitivity (S) up to 927.5 nm/RIU and a figure of merit (FOM) value of 98670.21/RIU, enabling the detection of sodium chloride (NaCl) solution concentration differences as low as 0.009 % and Bovine Serum Albumin (BSA) solution concentration differences as low as 0.005 %. These results indicate the potential application of our metasurface in mid-infrared fingerprint detection and solution sensing.

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基于连续介质中准束缚态的高性能中红外指纹检测与溶液传感

全介质超表面已成为中红外分子指纹检测的热门平台。然而，由于双端口漏模系统的吸收率最多只能达到0.5，这限制了吸收信号的对比度。本文提出了一种全介电准束缚态的连续介质超表面，并利用被检测物质在准bic传输过程中的消光系数实现了中红外分子指纹检测。以碳化硼（B4C）为例，成功地测量了其中红外分子指纹光谱，并在纳米尺度薄膜内取得了满意的结果。此外，它还表现出优异的传感性能，灵敏度(S)高达927.5 nm/RIU，优点系数（FOM）值为98670.21/RIU，可检测低至0.009%的氯化钠（NaCl）溶液浓度差异和低至0.005%的牛血清白蛋白（BSA）溶液浓度差异。这些结果表明了我们的超表面在中红外指纹检测和溶液传感方面的潜在应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.