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

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 response. 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, respectively.

arXiv comment7 pages, 4 figures

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Cited by in corpus (7)

• Hybrid Longitudinal-Transverse Phonon Polaritons
• Perspective: Phonon polaritons for infrared optoelectronics
• Theory of Optical Nonlocality in Polar Dielectrics
• Near-field radiative heat transfer between irregularly shaped dielectric particles modeled with the discrete system Green's function method
• Nonlocal Scattering Matrix Description of Anisotropic Polar Heterostructures
• Polaritonic quantisation in nonlocal polar material
• Ultrafast Optical Generation of Coherent Bright and Dark Surface Phonon Polaritons in Nanowires