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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 12 — Jun. 16, 2014
  • pp: 14473–14492

Near-field radiative transfer between two unequal sized spheres with large size disparities

Karthik Sasihithlu and Arvind Narayanaswamy  »View Author Affiliations

Optics Express, Vol. 22, Issue 12, pp. 14473-14492 (2014)

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We compute near-field radiative transfer between two spheres of unequal radii R1 and R2 such that R2 ≲ 40R1. For R2 = 40R1, the smallest gap to which we have been able to compute radiative transfer is d = 0.016R1. To accomplish these computations, we have had to modify existing methods for computing near-field radiative transfer between two spheres in the following ways: (1) exact calculations of coefficients of vector translation theorem are replaced by approximations valid for the limit dR1, and (2) recursion relations for a normalized form of translation coefficients are derived which enable us to replace computations of spherical Bessel and Hankel functions by computations of ratios of spherical Bessel or spherical Hankel functions. The results are then compared with the predictions of the modified proximity approximation.

© 2014 Optical Society of America

OCIS Codes
(030.5620) Coherence and statistical optics : Radiative transfer
(240.6690) Optics at surfaces : Surface waves
(260.2160) Physical optics : Energy transfer
(290.4020) Scattering : Mie theory
(290.4210) Scattering : Multiple scattering
(290.6815) Scattering : Thermal emission

ToC Category:
Physical Optics

Original Manuscript: March 24, 2014
Manuscript Accepted: May 27, 2014
Published: June 5, 2014

Karthik Sasihithlu and Arvind Narayanaswamy, "Near-field radiative transfer between two unequal sized spheres with large size disparities," Opt. Express 22, 14473-14492 (2014)

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