Open AccessRole of nanoparticles in wavelength selectivity of multilayered structures in the far-field and near-field regimes
Author(s) -
Alok Ghanekar,
Laura Lin,
Jia-Rui Su,
Haonan Sun,
Yi Zheng
Publication year - 2015
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.23.0a1129
Subject(s) - materials science , mie scattering , wavelength , radiative transfer , optics , refractive index , near and far field , emissivity , dielectric , fresnel equations , nanoparticle , molecular physics , optoelectronics , physics , scattering , light scattering , nanotechnology
Microscopic thin films have shown wavelength selectivity in the context of radiative heat transfer. We propose a methodology to shift the wavelength selectivity in the desired location. This work deals with the far-field and near-field radiation from thin films embedded with nanoparticles. The calculations of emission spectra are performed using the Fresnel equations in the far-field limit, and using the dyadic Green's function formalism for transmissivity between the closely spaced objects in the near-field regime. For the media doped with nanoparticles, an effective dielectric function using the Maxwell-Garnett-Mie theory is used to calculate emissivity and radiative heat transfer. It has been shown that the wavelength selectivity in the emission spectra can be influenced by varying the size and/or the volume fraction of nanoparticles. We characterize the wavelength selectivity using real and imaginary parts of the effective refractive index. We show that the influence of nanoparticles on wavelength selectivity is different depending on whether the particles are of polar materials or are metallic.