Lithography‐Free and High‐Generation Fractal Plasmonic Nanoantenna for Multispectral Infrared Sensing

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2025-06-27 DOI:10.1002/adfm.202509258

Ningfei Sun, Shuolei Zhang, Xingyu Liu, Peng Zhao, Xiaobo Xue, Nyachieo Kennedy Momanyi, Jianyu Sun, Limin Liu, Xiaoguang Wei, Ling Li, Yong Xie

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Abstract

Fractal plasmonic nanoantennas are widely used in plasmon‐enhanced infrared spectroscopy and multiband sensing applications due to their inherent broadband and multispectral characteristics. However, conventional fractal antennas are typically fabricated by high‐cost, unscalable, and complicated lithography processes. The inevitable diffraction limit restricts the fabrication of higher‐order fractals and the improvement of multiband infrared response. In this study, a lithography‐free Au fractal nanoantenna platform is developed via film dewetting. The antennas can support multiple resonances over a broad spectral range spanning from near‐infrared to mid‐infrared. The fractal orders can be controlled by adjusting dewetting times. Moreover, due to the spontaneous fractal growth mechanism, the iteration number is theoretically unlimited. Through electromagnetic field simulation and infrared spectroscopy, the fractal order‐dependent multiband resonance mode and dense “hot spots” enabled electric‐field enhancement are revealed. Based on the infrared‐enhanced antenna, a minimum detection limit of 6 nm for the thickness of poly(methyl methacrylate) nanolayers is achieved. Additionally, a noninvasive sensor concept for glucose molecules in aqueous solution is demonstrated. This study presents a lithography‐free approach for constructing high‐generation and large‐area fractal nanoantennas with multiband resonance capabilities, which holds great promise for trace detection and high‐sensitivity biochemical sensing of various analytes in the near‐ to mid‐infrared spectral region.

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用于多光谱红外传感的无光刻和高生成分形等离子体纳米天线

分形等离子体纳米天线由于其固有的宽带多光谱特性，在等离子体增强红外光谱和多波段传感应用中得到了广泛的应用。然而，传统的分形天线通常是由高成本、不可扩展和复杂的光刻工艺制造的。不可避免的衍射极限限制了高阶分形的制备和多波段红外响应的提高。在本研究中，采用薄膜脱湿的方法开发了一个无需光刻的金分形纳米天线平台。该天线可以支持从近红外到中红外的广泛光谱范围内的多个共振。通过调整脱湿次数可以控制分形的阶数。此外，由于自发分形生长机制，迭代次数在理论上是无限的。通过电磁场模拟和红外光谱分析，揭示了分形序相关的多波段共振模式和密集的“热点”使电场增强。基于红外增强天线，实现了对聚甲基丙烯酸甲酯纳米层厚度的最小检测限为6 nm。此外，一个无创传感器的概念，葡萄糖分子在水溶液中被证明。本研究提出了一种无需光刻的方法，用于构建具有多波段共振能力的高生成和大面积分形纳米天线，这对于近红外到中红外光谱区域各种分析物的痕量检测和高灵敏度生化传感具有很大的前景。

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

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.