Enhanced circular dichroism of cantilevered nanostructures by distorted plasmon

材料科学 纳米结构 悬臂梁 电子束光刻 制作 平版印刷术 纳米技术 等离子体子 表面等离子体子 圆二色性 聚二甲基硅氧烷 光学 光电子学 抵抗 图层(电子) 物理 结晶学 化学 复合材料 医学 替代医学 病理
作者
Ying Li,Yu Bai,Muhammad Ikram,Yaqi Ren,Yue Xu,Yongkai Wang,Yiping Huo,Zhongyue Zhang
出处
期刊:Optics Express [Optica Publishing Group]
卷期号:30 (13): 23217-23217 被引量:3
标识
DOI:10.1364/oe.462558
摘要

Chiral structures have a wide range of applications, such as biometric identification, chemical analysis, and chiral sensing. The simple fabrication process of chiral nanostructures that can produce a significant circular dichroism (CD) effect remains a challenge. Here, a three-dimensional (3D) cantilever-shaped nanostructure, which inherits the chiral advantages of 3D nanostructures and simplicity of 2D nanostructures, is proposed. The nanostructure can be prepared by the combination of one-time electron beam lithography and oblique-angle deposition and consists of a thin metal film with periodic holes such that two hanging arms were attached to the edges of holes. The length of the cantilever and the height difference between the two arms can be adjusted by controlling the tilt angle of beam current during the deposition processes. Numerical calculations showed that the enhancement of CD signal was achieved by plasmon distortion on the metal film by the lower hanging part of the cantilever structure. Furthermore, signals can be actively adjusted using a temperature-sensitive polydimethylsiloxane (PDMS) material. The angle between the lower cantilever and the top metal film was regulated by the change in PDMS volume with temperature. The results provide a new way to fabricating 3D nanostructures and a new mechanism to enhance the CD signal. The proposed nanostructure may have potential applications, such as in ultra-sensitive detection and remote temperature readout, and is expected to be an ultra-compact detection tool for nanoscale structural and functional information.
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