https://scholars.lib.ntu.edu.tw/handle/123456789/621122
標題: | Enhanced detection sensitivity of higher-order vibrational modes of gold nanodisks on top of a GaN nanorod array through localized surface plasmons | 作者: | Yang S.-C. Wei P.-K. Hsiao H.-H. Mante P.-A. Huang Y.-R. Chen I.-J. Chang H.-C. HUNG-CHUN CHANG CHI-KUANG SUN HUI-HSIN HSIAO |
公開日期: | 2014 | 卷: | 105 | 期: | 21 | 來源出版物: | Applied Physics Letters | 摘要: | We report a method that enables the excitation of localized surface plasmons (LSPs) in a gold nanodisk array by placing each nanodisk on top of a GaN nanorod. When the rod length was much longer than the plasmon penetration depth inside the nanorod, the plasmonic field was found to be localized, and coupling between neighboring gold nanodisks was eliminated. The interaction between LSPs and acoustic vibrations in gold nanodisks was then investigated. Owing to the strong localization of the plasmonic field, weak, higher-order vibrational modes of gold nanodisk could be optically observed. Furthermore, such an LSP-based acoustic sensor could be operated at any angle of incident light. Our study not only provides an approach to excite LSPs in high-density metallic arrays, but also opens one of the possible solutions for the development of highly sensitive sub-terahertz hypersonic sensors with high angle tolerance of incident light. © 2014 AIP Publishing LLC. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84912520402&doi=10.1063%2f1.4902830&partnerID=40&md5=66210bd91f0d546a7be1bea89e830d54 https://scholars.lib.ntu.edu.tw/handle/123456789/621122 |
DOI: | 10.1063/1.4902830 | SDG/關鍵字: | Gallium nitride; III-V semiconductors; Nanorods; Plasmonics; Acoustic Sensors; Acoustic vibration; Detection sensitivity; Localized surface plasmon; Metallic arrays; Nanodisk arrays; Strong localizations; Vibrational modes; Gold |
顯示於: | 工程科學及海洋工程學系 |
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