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O: Fachverband Oberflächenphysik
O 39: Focus Session: Phonon Polaritons: Opportunities for THz Nanooptics II
O 39.4: Vortrag
Dienstag, 13. März 2018, 14:45–15:00, HE 101
Phonon-Polaritonic Bowtie Nanoantennas: Controlling Infrared Thermal Radiation at the Nanoscale — Tao Wang1, Peining Li1, Dmitry N. Chigrin1,2, Alexander J. Giles3, Francesco J. Bezares4, Orest J. Glemboki3, Joshua D. Caldwell3,5, and •Thomas Taubner1 — 1RWTH Aachen University, Aachen, Germany — 2DWI Leibniz Institute for Interactive Materials, Aachen, Germany — 3U.S. Naval Research Laboratory, Washington DC, USA — 4Universidad de Puerto Rico, Cayey, Puerto Rico — 5Vanderbilt University, Nashville, TN, USA
A conventional thermal emitter exhibits a broad emission spectrum with a peak wavelength depending upon the operation temperature. Narrowband thermal emission can be realized with periodic gratings or single microstructures hosting Surface Phonon-Polaritons (SPhPs) [1-3], offering lower losses and higher resonance quality factors than the commonly used Surface Plasmon Polaritons (SPPs). Here, we investigate the coupling of adjacent phonon-polaritonic nanostructures, specifically deeply sub-diffractional bowtie-shaped silicon carbide nanoantennas. We employ infrared far-field reflectance spectroscopy and compare it with full-wave electromagnetic simulations and near-field optical nanoimaging. We experimentally demonstrate that the nanometer-scale-gaps can control the thermal emission frequency while retaining emission linewidths as narrow as 10 cm-1[4].
[1] J. J. Greffet et al, Nature 416, 61 (2002). [2] J. A. Schuller et al, Nature Photon. 3, 658 (2009). [3] J. D. Caldwell, et al., Nanophotonics 4, 44 (2015). [4] T. Wang et al., ACS Photonics 4, 1753 (2017).