Open AccessSimulation study on light color conversion enhancement through surface plasmon coupling
Author(s) -
WenChun Chang,
YaoHaur Kuo,
YeanWoei Kiang,
C. C. Yang
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.00a629
Subject(s) - wavelength , absorption (acoustics) , optics , materials science , quantum dot , optoelectronics , surface plasmon resonance , surface plasmon , coupling (piping) , dipole , excited state , plasmon , discrete dipole approximation , energy conversion efficiency , physics , nanoparticle , atomic physics , scattering , nanotechnology , quantum mechanics , metallurgy
A theoretical model together with a numerical algorithm of surface plasmon (SP) coupling are built for simulating SP-enhanced light color conversion from a shorter-wavelength radiating dipole (representing a quantum well - QW) into a longer-wavelength one (representing a quantum dot - QD) through QD absorption at the shorter wavelength. An Ag nanoparticle (NP) located between the two dipoles is designed for producing strong SP couplings simultaneously at the two wavelengths. At the QW emission wavelength, SP couplings with the QW and QD dipoles lead to the energy transfer from the QW into the QD and hence the absorption enhancement of the QD. At the QD emission wavelength, SP coupling with the excited QD dipole results in the enhancement of QD emission efficiency. The combination of the SP-induced effects at the two wavelengths leads to the increase of overall color conversion efficiency. The color conversion efficiencies in using Ag NPs of different geometries or SP resonance behaviors for producing different QD absorption and emission enhancement levels are compared.