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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Plasmonics & Nanooptics II: SHG and Dielectric Properties (joint session O/CPP)

O 31.6: Vortrag

Dienstag, 2. April 2019, 15:15–15:30, H8

Resonant Field Enhancement of Epsilon Near Zero Berreman Modes in an Ultrathin AlN Film — •Nikolai Christian Passler1, Ilya Razdolski1, Joshua D. Caldwell2, Martin Wolf1, and Alexander Paarmann11Fritz-Haber-Institute of the MPG, Berlin, Germany — 2Vanderbilt University, Nashville, USA

In nanophotonics, the strongly enhanced local optical fields of polaritonic modes are the driving force of nonlinear optical phenomena. In sub-wavelength thin polar dielectric films, a polaritonic Berreman mode arises at the longitudinal optical phonon frequency where the dielectric permittivity crosses zero [1]. Complementary to this radiative epsilon near zero (ENZ) mode, also an evanescent ENZ polariton is supported at large in-plane momenta [2], exhibiting similar properties. At resonance, the Berreman mode features an immense field enhancement, enabling to boost the efficiency of nonlinear nanophotonic applications like all-optical ultrafast switching.

Employing a mid-infrared free-electron laser, we investigate the second harmonic generation (SHG) of an ultrathin AlN layer on top of bulk SiC. The employed SHG spectroscopy [3] serves as a direct experimental probe of the tremendous field enhancement of the high-quality, strongly confined ENZ Berreman mode. With these properties, the AlN thin-film Berreman mode offers an appealing platform for the development of novel infrared nanophotonic devices.

[1] Vassant et al., Optics Express 20, 23971 (2012)

[2] Passler et al., Nano Letters 18, 4285 (2018)

[3] Paarmann et al., Applied Physics Letters 107, 081101 (2015)

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