Abstract Plasmonic color filters (PCFs) with subwavelength nanometallic structures have irreplaceable advantages over traditional organic dye color filters due to their unique characteristics. However, most PCFs excite weak resonances and show low selectivity, which will limit their accuracy and further applications. In this paper, we introduce a PCF design utilizing tapered annular aperture arrays, which not only shows high resonance intensity, but also achieves the light-splitting effect in the wavelength ranges of visible and near-infrared. The proposed device is comprehensively verified by COMSOL Multiphysics. The results show that ideal filtering effect can be achieved with the tilting angle ranging from 0°to 40°. Geometric parameters (period and aperture range) are also investigated, which can provide an instructive theoretical basis for the preparation of PCFs. The proposed device may find extensive potential applications in micro–nano sensing and optical imaging and inspection.

中文翻译：

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基于锥形环形孔径阵列的高选择性等离子体滤色器

摘要 具有亚波长纳米金属结构的等离子体滤色器（PCFs）由于其独特的特性，比传统的有机染料滤色器具有不可替代的优势。然而，大多数 PCF 激发弱共振并表现出低选择性，这将限制其准确性和进一步应用。在本文中，我们介绍了一种利用锥形环形孔径阵列的 PCF 设计，它不仅显示出高共振强度，而且在可见光和近红外波长范围内实现了分光效果。COMSOL Multiphysics 对提议的设备进行了全面验证。结果表明，在0°～40°的倾角范围内可以达到理想的滤波效果。还研究了几何参数（周期和孔径范围），可为PCFs的制备提供指导性的理论基础。所提出的设备可能会在微纳米传感和光学成像和检测中找到广泛的潜在应用。