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Plasmon line shaping using nanocrosses for high sensitivity localized surface plasmon resonance sensing

机译：使用纳米交叉的等离子线整形可实现高灵敏度的局部表面等离子体共振检测

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摘要

The detection of small changes in the wavelength position of localized surface plasmon resonances in metal nanostructures has been used successfully in applications such as label-free detection of biomarkers. Practical implementations, however, often suffer from the large spectral width of the plasmon resonances induced by large radiative damping in the metal nanocavities. By means of a tailored design and using a reproducible nanofabrication process, high quality planar gold plasmonic nanocavities are fabricated with strongly reduced radiative damping. Moreover, additional substrate etching results in a large enhancement of the sensing volume and a subsequent increase of the sensitivity. Coherent coupling of bright and dark plasmon modes in a nanocross and nanobar is used to generate high quality factor subradiant Fano resonances. Experimental sensitivities for these modes exceeding 1000 nm/RIU with a Figure of Merit reaching 5 are demonstrated in microfluidic ensemble spectroscopy.
机译：金属纳米结构中局部表面等离振子共振的波长位置的微小变化的检测已成功用于诸如生物标记的无标记检测等应用中。然而，实际的实施方式常常遭受由金属纳米腔中的大辐射阻尼引起的等离激元共振的大光谱宽度的困扰。通过量身定制的设计并使用可重复的纳米制造工艺，可以在大大降低辐射阻尼的情况下制造出高质量的平面金等离激元纳米腔。此外，额外的基板蚀刻导致感测体积大大增强，并随后提高了灵敏度。纳米交叉和纳米棒中亮和暗等离振子模式的相干耦合用于生成高质量因子的亚辐射法诺共振。这些模式的实验灵敏度超过1000 nm / RIU，品质因数达到5，已在微流体集成光谱学中得到证明。

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