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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 20387–20393

Tailoring optical properties of surface charged dielectric nanoparticles based on an effective medium theory

Neng Wang, Shiyang Liu, and Zhifang Lin  »View Author Affiliations


Optics Express, Vol. 21, Issue 17, pp. 20387-20393 (2013)
http://dx.doi.org/10.1364/OE.21.020387


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Abstract

We propose an effective-medium theory (EMT) for the surface charged dielectric nanoparticles (CDNPs) in the long wavelength limit, in which a homogenous CDNP is demonstrated to be equivalent to a conventional absorbing neutral particle of the same size but with different constitutive parameters (effective permittivity εe and effective permeability μe). It is found that while the surface charge induces negligible change of magnetic permeability in particle, it gives rise to a significant change of electric permittivity. The change in permittivity depends on the charge, the particle size, and the working frequency but is independent of the constituent material. In infrared frequencies, both the real and imaginary parts of the particle permittivity may be changed considerably by surface charging. At higher frequency, the surface charge can lead to a remarkable decrease in the real part of the permittivity while keeping its imaginary part nearly unchanged. Therefore, based on EMT we can tailor the optical properties of CDNPs by optimizing their parameters, allowing for many exotic phenomena, such as vanishing scattering efficiency, great enhancement of light absorption efficiency, and surface charge induced surface plasmon resonance.

© 2013 OSA

OCIS Codes
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles
(260.2065) Physical optics : Effective medium theory

ToC Category:
Scattering

History
Original Manuscript: June 21, 2013
Revised Manuscript: August 2, 2013
Manuscript Accepted: August 12, 2013
Published: August 22, 2013

Virtual Issues
Vol. 8, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Neng Wang, Shiyang Liu, and Zhifang Lin, "Tailoring optical properties of surface charged dielectric nanoparticles based on an effective medium theory," Opt. Express 21, 20387-20393 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-17-20387


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