Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 20: Nano-Optics II

Q 20.4: Talk

Tuesday, March 7, 2017, 11:45–12:00, P 11

Radiative heat transfer between spatial nonlocal dielectric sphere and plate — •Robin Schmidt and Stefan Scheel — Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23, D-18059 Rostock, Germany

With the advances in modern nanophotonics and nanooptics, ever smaller metallic and dielectric structures become feasible. The strongly confined evanescent fields are associated with enormous field enhancements, thus providing heat transfer rates orders of magnitudes larger than feasible in the conventional far-field limit [1]. At nanoscale separation, the thermal heat transfer rate is predicted to diverge for ever smaller separation distances. To overcome this unphysical behaviour, the spatial nonlocal properties of the media under consideration must be taken into account [2,3]. Here, we compute the energy flux between a spatially nonlocal sphere and a plate separated by a vacuum interface. The thermal sources are correlated according to the fluctuation-dissipation theorem. In this linear response regime, spill-out effects can be neglected. Therefore, we employ the Huygens principle and the extinction theorem together with Maxwell boundary conditions [4].

[1] E. Rousseau, et al., Nat. Phot. 3, 514 (2009).

[2] A. Kittel, W. Müller-Hirsch, J. Parisi, S.-A. Biehs, D. Reddig, and M. Holthaus, Phys. Rev. Lett. 95, 224301 (2005).

[3] C. Henkel and K. Joulain, Appl. Phys. B 84, 61 (2006).

[4] R. Schmidt and S. Scheel, Phys. Rev. A 93, 033804 (2016).