Topological darkness in random gold metasurfaces for high sensitivity detection using phase interrogation

Juan Pablo Cuanalo Fernandez, N. Korneev, I. Cosme-Bolanos, María Beatriz de la Mora Mojica, Irving Gazga Gurrión, S. Mansurova, R. Ramos García
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Abstract

In this study, we investigate the phenomenon of nearly zero reflectance and associated phase singularity in a random array of gold nanoislands (Au NI) both theoretically and experimentally. The Au NI were produced via solid-state thermal dewetting of ultrathin gold films, which were magnetron sputtered onto a glass substrate. The morphology of the nanoislands was characterized using scanning electron microscopy and atomic force microscopy. To understand the plasmonic response of the random array of Au NI, we conducted reflectance measurements for both s and p polarized beams demonstrating the p. These measurements were performed using the attenuated total internal reflectance configuration. A partial state of topological darkness in a random array of Au NI was demonstrated by showing nearly zero reflection for the p polarization component. Additionally, we employed a common path spectral interferometer to measure the differential phase spectra. Our findings revealed that the differential phase spectra exhibited abrupt ±π phase jumps, indicating the presence of a phase singularity regime. Moreover, we demonstrated high bulk reflectance index sensitivity (RIS) within this regime. To validate our experimental results, we compared them with analytical reflectance and phase spectra obtained through the application of island film theory. The agreement between the experimental and theoretical predictions provided strong confirmation of our measurement technique.
基于相位询问的随机金超表面拓扑暗度高灵敏度检测
在这项研究中,我们从理论上和实验上研究了金纳米岛(Au NI)随机阵列的近零反射率和相关的相位奇点现象。通过磁控溅射到玻璃衬底上的超薄金膜的固态热脱湿制备了Au NI。利用扫描电子显微镜和原子力显微镜对纳米岛的形貌进行了表征。为了了解Au NI随机阵列的等离子体响应,我们对s和p极化光束进行了反射率测量,以显示p。这些测量是使用衰减的总内反射配置进行的。通过对p偏振分量的反射接近于零,证明了随机Au NI阵列中拓扑黑暗的部分状态。此外,我们采用了共程光谱干涉仪来测量差分相位光谱。我们的研究结果表明,微分相谱表现出突然的±π相跃,表明存在相奇点区。此外,我们还证明了在该范围内具有较高的体反射指数灵敏度(RIS)。为了验证我们的实验结果,我们将其与应用岛膜理论得到的解析反射率和相谱进行了比较。实验和理论预测的一致性为我们的测量技术提供了强有力的证实。
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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