Significant improvement in using plasmonic nanostructures for practical color filtering and multispectral imaging applications is achieved by exploiting the coupling of surface plasmons with dielectric optical cavity resonances within a hexagonal array of subwavelength holes in a thin CMOS-compatible metal–insulator–metal stack. This polarization-independent architecture overcomes the limitations of all previously reported plasmonic color filters, namely poor transmission and broad band-pass characteristic, effectively providing a compact approach for high color accuracy multispectral and filtering technologies. Measured transmission efficiencies up to 60% and full-width at half-maximum between 45 and 55 nm along the entire visible spectrum are achieved, an impressive and unique combination of features that has never been reported before. The nanostructure exploits the phenomenon of extraordinary optical transmission and magnetic dipole modes to efficiently filter visible light. The presence of magnetic resonances in the optical regime is an unusual property, previously reported in photonic metamaterials or dielectric nanoparticles. The physical insights established from the electromagnetic near-field patterns are used to accurately tailor the optical properties of the filters. The nonideality of the fabrication at the nanoscale is addressed, the issues encountered highlighted, and alternative solutions proposed and verified, demonstrating that the working principle of the MIM structure can be successfully extended to other materials and structural parameters.

中文翻译：

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利用金属-绝缘体-金属等离子纳米结构中的磁偶极子共振来选择性滤除可见光

通过将表面等离子体激元与在兼容CMOS的金属-绝缘体-金属薄堆叠中的亚波长孔的六边形阵列中的介电光学腔共振耦合，可以在实际的彩色滤光和多光谱成像应用中使用等离激元纳米结构取得显着改善。这种与偏振无关的体系结构克服了所有先前报道的等离激元彩色滤光片的局限性，即传输性能差和宽带通过特性，有效地为高色彩精度多光谱和滤光技术提供了一种紧凑的方法。在整个可见光谱范围内，测得的传输效率高达60％，最大宽度为半峰（最大宽度为45至55 nm），这是前所未有的令人印象深刻且独特的功能组合。纳米结构利用非凡的光学传输和磁偶极子模式现象来有效过滤可见光。先前在光子超材料或介电纳米粒子中报道过，在光学状态下磁共振的存在是一种不寻常的特性。从电磁近场模式建立的物理洞察力可用于精确调整滤波器的光学特性。解决了纳米级制造的非理想性，突出了遇到的问题，并提出并验证了替代解决方案，表明MIM结构的工作原理可以成功地扩展到其他材料和结构参数。