Abstract

Self-assembled, irregular ensembles of hemi, spherical Ga nanoparticles (NPs) were deposited on sapphire by molecular beam epitaxy. These samples, whose constituent unimodal or bimodal distribution of NP sizes was controlled T deposition time, exhibited. localized surface plasmon resonances tunable from the ultraviolet to the visible (UV/vis) spectral range. The optical response of each sample was characterized using a variable-angle spectroscopic ellipsometer, and the dielectric response of the ensemble of NPs on each sample was parametrized using Lorentz oscillators. From this, a relationship was found between NP size and the deduced Lorentzian parameters (resonant frequency, damping, oscillator strength) for most unimodal and bimodal samples at most frequencies and angles of incidence. However, for samples with a bimodal size distribution, Mueller matrix ellipsometry revealed nonspecular scattering at particular frequencies and angles suggesting a resonant interparticle coupling effect consistent with recently observed strong local field enhancements in the ultraviolet.

Autore Pugliese

• Losurdo Maria

Tutti gli autori

• Yang Y.; Akozbek N.; Kim T.-H.; Marcos Sanz J.; Moreno F.; Losurdo M.; Brown A.S.; Everitt H.O.

Titolo volume/Rivista

ACS photonics

Anno di pubblicazione

2014

ISSN

2330-4022

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile