Multi-mode plasma resonator based on multi metal-coated nanorods
- PDF / 1,666,578 Bytes
- 6 Pages / 595.276 x 785.197 pts Page_size
- 38 Downloads / 155 Views
THE EUROPEAN PHYSICAL JOURNAL D
Regular Article
Multi-mode plasma resonator based on multi metal-coated nanorods Xiaomeng Zhang1 , Guanxia Yu2,a , Ruoyu Cao3 , and Yihang Lv2 1 2 3
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, P.R. China College of Science, Nanjing Forestry University, Nanjing 210037, P.R. China Faculty of Science, McGill University, Montreal H3A 0G4, Canada Received 31 July 2019 / Received in final form 31 January 2020 Published online 7 July 2020 c EDP Sciences / Societ`
a Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2020 Abstract. The surface plasmon resonance and strong coupling of three layers of metal-coated nanorods are studied in this paper. Numerical results show that an incident electromagnetic wave with a particular frequency can be guided through localized surface plasma resonances to different-sized cavities, realizing excellent absorbance of electromagnetic waves. The refractive index of the surrounding medium also influences the resonant frequency dramatically. Different metal shell thicknesses and materials can be used to effectively adjust the formant frequency. These unique properties of multi-mode resonance and excellent absorbance of electromagnetic waves in a multi-nanorod system have prospective applications in the fields of plasmon resonant sensors, resonators.
1 Introduction Surface plasmons (SPs) have unique properties and provide many opportunities to tune, manipulate, and guide electromagnetic (EM) waves [1] in optics, magnetooptic data storage, microscopy, and solar cells. Their many specific applications, such as high-sensitivity sensors [2], super-resolution imaging [3], and cloaking [4], have attracted increasing attention. As surface waves, SPs are evanescent waves and propagate along the interface between metal with native permittivity and a normal dielectric material [5]. Incident EM waves are trapped on the metal surface where they interact with free electrons. The free electrons on the metal surface respond collectively by oscillating in resonance with the EM waves. Resonant interactions oscillate at certain frequencies between surface electrons, and the EM waves excite the SPs and generate unique properties. SPs are accompanied by localized enhancement of EM waves to concentrate and channel waves using special structures [6]. The functionality of these properties depends on EM excitations coupled with electrons at the metal-dielectric interface. Recently, SPs excited by EM waves with optical frequencies is one of the most attractive issues. In subwavelength structures, SPs can concentrate and channel EM waves on length scales below the diffraction limit as well as miniaturize photonic circuits with length scales much smaller than those of traditional optical components a
e-mail: [email protected]
[7,8]. Many potential applications have been developed for such multi-nanostructures, such as surface-enhanced Raman scattering [9], light concentrators [10], and superresolution [11]. To e
Data Loading...
