Concave microlens assisted optoplasmonic trapping in Au nanohole

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-05-06 DOI:10.1016/j.optcom.2025.131971

YiLu Chen , Yan Zhao , Li Wang , Yingzhou Huang

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引用次数: 0

Abstract

Utilizing the dielectric microstructure to confine optical energy, this work significantly enhances localized surface plasmon resonance (LSPR) effects for superior light-matter interaction. This study introduces an optoplasmonic tweezer integrated with a concave dielectric microlens and the metal thin-film system, engineered for efficient nanoparticle trapping and dynamic manipulation. Using finite element analysis, we optimized the size and spacing of Au nanoparticles (AuNPs) on the thin film to maximize the electric field intensity in the nanohole on the Au film. The structural parameters of the designed concave microlens were also investigated to optimize light confinement while enabling fluid transportation function. The results demonstrate that the optoplasmonic tweezer we proposed can achieve an approximately 400-fold enhancement of the electric field within the Au nanohole, exhibiting exceptional performance in trapping nanoparticles in a fluid. We propose an optoplasmonic structure composed of concave microlens and AuNPs, which can enable simultaneous integration both microfluidic channels and trap nanoparticles, providing a new idea for trapping nanoparticles in fluids.

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凹微透镜辅助光等离子体在金纳米孔中的捕获

利用介电微观结构来限制光能，本研究显著增强了局部表面等离子体共振（LSPR）效应，实现了优越的光-物质相互作用。本研究介绍了一种集成了凹介质微透镜和金属薄膜系统的光等离子体镊子，用于高效的纳米粒子捕获和动态操作。通过有限元分析，我们优化了Au纳米颗粒（AuNPs）在薄膜上的尺寸和间距，以最大限度地提高Au薄膜上纳米孔的电场强度。研究了所设计的凹微透镜的结构参数，以优化光约束，同时实现流体输运功能。结果表明，我们提出的光等离子体镊子可以在金纳米孔内实现约400倍的电场增强，在捕获流体中的纳米颗粒方面表现出优异的性能。我们提出了一种由凹微透镜和AuNPs组成的光等离子体结构，可以同时集成微流体通道和捕获纳米颗粒，为捕获流体中的纳米颗粒提供了新的思路。

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.