圆极化
圆二色性
手性(物理)
等离子体子
材料科学
超材料
等离子纳米粒子
光子学
纳米颗粒
光学
光电子学
分子物理学
纳米技术
物理
对称性破坏
化学
自发对称破缺
结晶学
量子力学
Nambu–Jona Lasinio模型
微带线
作者
Xu Ouyang,Chenhui Li,Yaoyu Cao,Yi Xu,Xiangping Li
出处
期刊:ACS Photonics
[American Chemical Society]
日期:2023-02-22
卷期号:10 (7): 2407-2413
被引量:1
标识
DOI:10.1021/acsphotonics.2c01736
摘要
Metamaterials exhibiting orders-of-magnitude enhanced artificial chiroptical response than natural counterparts have been intensely investigated. The underlying principle of these chiral responses heavily hinges on an elaborate nanostructure fabrication to generate either intrinsic geometry chirality or handedness-dependent mode interference. Here, we unveil that localized spontaneous chiroptical response can be leveraged by plasmonic nanoaggregates with a disordered coupling effect. The near-field coupling among disordered individual gold nanoparticles leads to localized hot spots that are sensitive to the handedness of light. As a consequence, the nearby nanoparticles showcase near-unity circular dichroism in linear absorption to left- and right-circularly polarized light. It directly leads to a subsequent selective photothermal deformation of plasmonic nanoparticles, which produces prominent nonlinear circular dichroism in two-photon fluorescence by circular polarization beams. Such localized spontaneous chirality is then experimentally evidenced by nanoscale multiplexing watermarks in polychromatic beams with left- and right-circular polarizations. Our results might open a new strategy to tailor the chiroptical response in disordered photonic systems and facilitate the study of chiral light–matter interactions at the deep-subwavelength regime.
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