Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 NanoscaleTao Wang1, Peining Li1, Dmitry N. Chigrin1,2, Alexander J. Giles3, Francesco J. Bezares4, Orest J. Glemboki3, Joshua D. Caldwell3,5, and •Thomas Taubner11RWTH 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).

100% | Bildschirmansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2018 > Berlin