標題: | Circular Dichroism in Nanoparticle Helices as a Template for Assessing Quantum-Informed Models in Plasmonics |
作者: | Tserkezis, Christos Yesilyurt, A. T. Mina Huang, Jer-Shing Mortensen, N. Asger 電子物理學系 Department of Electrophysics |
關鍵字: | plasmonics nanoparticle helices;circular dichroism;quantum-informed models;nonlocal screening;Landau damping;electron tunneling |
公開日期: | 1-十二月-2018 |
摘要: | As characteristic lengths in plasmonics rapidly approach the sub-nanometer regime, quantum-informed models that can capture those aspects of the quantum nature of the electron gas that are not accessible by the standard approximations of classical electrodynamics, or even go beyond the free-electron description, become increasingly more important. Here we propose a template for comparing and validating the predictions of such models, through the circular dichroism signal of a metallic nanoparticle helix. For illustration purposes, we compare three widely used models, each dominant at different nanoparticle separations and governed by its own physical mechanism, namely, the hydrodynamic Drude model, the generalized nonlocal optical response theory, and the quantum-corrected model for tunneling. Our calculations show that, indeed, each case is characterized by a fundamentally distinctive response, always dissimilar to the predictions of the local optical response approximation of classical electrodynamics, dominated by a model-sensitive absorptive double-peak feature. In circular dichroism spectra, the striking differences between models manifest themselves as easily traceable sign changes rather than neighboring absorption peaks, thus overcoming experimental resolution limitations and enabling efficient evaluation of the relevance, validity, and range of applicability of quantum-informed theories for extreme-nanoscale plasmonics. |
URI: | http://dx.doi.org/10.1021/acsphotonics.8b01261 http://hdl.handle.net/11536/148644 |
ISSN: | 2330-4022 |
DOI: | 10.1021/acsphotonics.8b01261 |
期刊: | ACS PHOTONICS |
Volume: | 5 |
起始頁: | 5017 |
結束頁: | 5024 |
顯示於類別: | 期刊論文 |