Second harmonic generation from strongly coupled localized and propagating phonon-polariton modes

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Razdolski, Ilya
Passler, Nikolai Christian
Gubbin, Christopher R
Winta, Christopher J
Cernansky, Robert
Martini, Francesco
Politi, Alberto
Maier, Stefan A
Wolf, Martin
Paarmann, Alexander
De Liberato, Simone
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2018
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Abstract

We experimentally investigate second harmonic generation from strongly coupled localized and propagative phonon-polariton modes in arrays of silicon carbide nanopillars. Our results clearly demonstrate the hybrid nature of the system's eigenmodes and distinct manifestation of strong coupling in the linear and nonlinear responses. While in linear reflectivity the intensity of the two strongly coupled branches is essentially symmetric and well explained by their respective localized or propagative components, the second harmonic signal presents a strong asymmetry. Analyzing it in detail, we reveal the importance of interference effects between the nonlinear polarization terms originating in the bulk and in the phonon-polariton modes.

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Physical Review B
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© 2018 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
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Nanotechnology
Science & Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
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Razdolski, I; Passler, NC; Gubbin, CR; Winta, CJ; Cernansky, R; Martini, F; Politi, A; Maier, SA; Wolf, M; Paarmann, A; De Liberato, S, Second harmonic generation from strongly coupled localized and propagating phonon-polariton modes, Physical Review B, 2018, 98 (12), pp. 125425
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