標題: Role of Depolarization Factors in the Evolution of a Dipolar Plasmonic Spectral Line in the Far- and Near-Field Regimes
作者: Januar, Mochamad
Liu, Bei
Cheng, Jui-Ching
Hatanaka, Koji
Misawa, Hiroaki
Hsiao, Hui-Hsin
Liu, Kou-Chen
交大名義發表
National Chiao Tung University
公開日期: 6-二月-2020
摘要: In this article, the excitation of dipolar localized surface plasmon resonances (LSPRs) in both the far- and near-field regions is described in terms of the relevant static, dynamic, and radiative depolarization factors. This approach offers a direct relationship between the evolution of the LSPR spectral line and the depolarization components in an analogous sense to a harmonic oscillator. The static, dynamic, and radiative terms reflect the coefficients of the "stiffness", effective mass, and damping in the oscillator system, respectively. Hence, one can immediately perceive that the static part of the depolarization factor is mainly responsible for the shifts in the resonant frequency, and the radiative part is responsible for the change in bandwidth. Additionally, the dynamic part behaves like an effective mass, acting as an inertial weighting factor that decides how significant the changes taking place in the system are. From this model, we can rationalize that the qualitative behavior of the far-field efficiency primarily depends on the shifting resonant frequencies, and the corresponding near-field efficiency is highly sensitive to the presence of damping. The model also clarifies the discrepancy in the resonant frequency and bandwidth between the far- and near-field spectra, which is due to the significant presence of the radiative component. These basic descriptions can be used as a guiding principle for handling more sophisticated structures and gaining more rationalized designs for novel applications related to the LSPR mechanism.
URI: http://dx.doi.org/10.1021/acs.jpcc.9b10485
http://hdl.handle.net/11536/153709
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.9b10485
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 124
Issue: 5
起始頁: 3250
結束頁: 3259
顯示於類別:期刊論文