期刊
NANO LETTERS
卷 21, 期 9, 页码 4044-4050出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00941
关键词
Chalcogenide phase change material; Plasmonics; Electrical control of visible plasmonics; Metasurfaces; Microheaters
类别
资金
- Advanced Manufacturing and Engineering (AME) Programmatic by Agency for Science, Technology and Research [A18A5b0056]
In this experiment, tunable plasmonic resonances at visible wavelengths were achieved using the chalcogenide semiconductor alloy Sb2Te3, showing different properties of plasmonic resonances based on different nanostructures in this material. Electrically tunable Sb2Te3-based plasmonic devices could potentially be applied in the development of active color filters.
The realization of electrically tunable plasmonic resonances in the ultraviolet (UV) to visible spectral band is particularly important for active nanophotonic device applications. However, the plasmonic resonances in the UV to visible wavelength range cannot be tuned due to the lack of tunable plasmonic materials. Here, we experimentally demonstrate tunable plasmonic resonances at visible wavelengths using a chalcogenide semiconductor alloy such as antimony telluride (Sb2Te3), by switching the structural phase of Sb2Te3 from amorphous to crystalline. We demonstrate the excitation of a propagating surface plasmon with a high plasmonic figure of merit in both amorphous and crystalline phases of Sb2Te3 thin films. We show polarization-dependent and -independent plasmonic resonances by fabricating one and two-dimensional periodic nanostructures in Sb2Te3 thin films, respectively. Moreover, we demonstrate electrically tunable plasmonic resonances using a microheater integrated with the Sb2Te3/Si device. The developed electrically tunable Sb2Te3-based plasmonic devices could find applications in the development of active color filters.
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