Palermo Giovanna, Rippa Massimo, Aceti Dante M, Guglielmelli Alexa, Valente Liliana, Sagnelli Domenico, D'Avino Amalia, Guilcapi Bryan, Maccaferri Nicolò, Petti Lucia, Strangi Giuseppe
Department of Physics, NLHT-Lab, University of Calabria and CNR-NANOTEC, Institute of Nanotechnology, 87036 Rende, Italy.
Institute of Applied Sciences and Intelligent Systems "E. Caianiello" CNR, 80078 Pozzuoli, Italy.
Nano Lett. 2024 Aug 21;24(33):10202-10209. doi: 10.1021/acs.nanolett.4c02530. Epub 2024 Aug 6.
Plasmonic metasurfaces with spatial symmetry breaking are crucial materials with significant applications in fields such as polarization-controlled photonic devices and nanophotonic platforms for chiral sensing. In this paper, we introduce planar plasmonic metasurfaces, less than one-tenth of a wavelength thick, featuring nanocavities formed by three equilateral triangles. This configuration creates uniform, thin metasurfaces. Through a combination of experimental measurements and numerical modeling, we demonstrate the inherent superchirality of these plasmonic metasurfaces. We address the challenge of achieving a strong enhancement of optical chirality in the visible spectrum, reaching levels comparable to those of 3D chiral metasurfaces.
具有空间对称性破缺的等离激元超表面是一类关键材料，在偏振控制光子器件和用于手性传感的纳米光子平台等领域具有重要应用。在本文中，我们介绍了厚度小于十分之一波长的平面等离激元超表面，其具有由三个等边三角形形成的纳米腔。这种结构产生了均匀的薄超表面。通过实验测量和数值模拟相结合，我们证明了这些等离激元超表面固有的超手性。我们解决了在可见光谱中实现光学手性强烈增强的挑战，达到了与三维手性超表面相当的水平。
