Next Article in Journal
Input–Output Finite Time Stabilization of Time-Varying Impulsive Positive Hybrid Systems under MDADT
Previous Article in Journal
NIRExpNet: Three-Stream 3D Convolutional Neural Network for Near Infrared Facial Expression Recognition
Article Menu
Issue 11 (November) cover image

Export Article

Open AccessArticle
Appl. Sci. 2017, 7(11), 1183; https://doi.org/10.3390/app7111183

Gap-Dependent Localized High Energy Multiple Dipolar Modes in Passive Silver-Coated Silica Nanoparticle Antennas

1
Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Department of Physics, Abdul Wali Khan University Mardan, Mardan 23200 KPK, Pakistan
*
Author to whom correspondence should be addressed.
Received: 24 October 2017 / Accepted: 2 November 2017 / Published: 17 November 2017
(This article belongs to the Special Issue Nano-Antennas)
View Full-Text   |   Download PDF [3201 KB, uploaded 17 November 2017]   |  

Abstract

The gap-induced plasmonic response of metallic nanoparticles drastically changes the near and far-field properties of nanoparticle antenna. Similar to a pair of metallic nanostructures, the two nanoparticles, with a dielectric core and silver shell in close proximity, exhibit multiple high energy plasmonic resonances at the short wavelength end of their optical spectrum. In this article, we have overwhelmingly investigated the disparity in the electric field of a core–shell dimer antenna when the gap between nanoparticles within the dimer becomes sub-nanometer in length. We used an electromagnetic planewave to excite the core–shell nanoparticles within the dimer. Frequency domain Finite Element Method (FEM) was employed for the numerical optical analysis of a dimer comprised of two silver-coated silica (SCS) nanoparticles in close proximity, using Computer Simulation Technology (CST) Microwave Studio. A modified Drude model has been used to predict the optical properties of the system with incorporating the size effects. The SCS dimer was numerically analyzed in the visible frequency band, and anomalies in near-field plasmonic coupling were investigated in detail. The inter-surface gap g between nanoparticles within the dimer varied in a range from 0.1 to 402 nm. View Full-Text
Keywords: core–shell nanoparticles; silver; coupling; near field; Multiple dipolar modes; gap; Plasmons core–shell nanoparticles; silver; coupling; near field; Multiple dipolar modes; gap; Plasmons
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Rahman, A.U.; Geng, J.; Rehman, S.U.; Hayat, K.; Liang, X.; Jin, R. Gap-Dependent Localized High Energy Multiple Dipolar Modes in Passive Silver-Coated Silica Nanoparticle Antennas. Appl. Sci. 2017, 7, 1183.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top