Photoluminescence Revealed Higher Order Plasmonic Resonance Modes and Their Unexpected Frequency Blue Shifts in Silver-Coated Silica Nanoparticle Antennas

Applied Sciences

AttaUr Rahman¹  Tao Hang¹  Ronghong Jin¹  SamiUr Rehman¹  Xianling Liang¹  Junping Geng¹  Qaisar Hayat¹  RichardW. Ziolkowski² 

[1] Electronic Engineering Department, Shanghai Jiao Tong University, Shanghai 200240, China;Global Big Data Technologies Centre, University of Technology Sydney, Ultimo NSW 2007, Australia;

关键词: core–shell nanoparticle;    nanoantenna;    blue shift;    higher order modes;    size-dependent optical losses;   

DOI  :  10.3390/app9153000

来源: DOAJ

【 摘 要 】

Higher order plasmonic resonance modes and their frequency blue shifts in silver-coated silica nanoparticle antennas are studied. Synthesizing them with a wet chemistry method, silica (SiO₂) nanoparticles were enclosed within silver shells with different thicknesses. A size-dependent Drude model was used to model the plasmonic shells and their optical losses. Two higher order plasmonic resonances were identified for each case in these simulations. The photoluminescence spectroscopy (PL) experimental results, in good agreement with their simulated values, confirmed the presence of those two higher order resonant modes and their resonance frequencies. When compared with pure metallic Ag nanoparticles, size-induced blue shifts were observed in these resonance frequencies.

【 授权许可】

Unknown