2020
DOI: 10.1021/acsphotonics.0c01680
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Nonlinear Shift in Phonon-Polariton Dispersion on a SiC Surface

Abstract: A nonlinear shift in the dispersion relation of a surface phonon-polariton (SPhP) is observed with grating-coupled pump–probe reflection spectroscopy. Upon excitation of an SPhP on a 4H-SiC surface, an instantaneous frequency shift of the SPhP mode at a constant wavevector is observed. This pump-induced frequency shift is equivalent to a nonlinear dispersion shift and to a Kerr-like nonlinear phase shift. The effective nonlinear index is evaluated to be orders of magnitude larger than the typical values of non… Show more

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Cited by 11 publications
(7 citation statements)
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“…Moreover strong third-order optical nonlinearities were also recently observed in SiC by measuring the self-phase modulation [143] of a propagative surface phonon polariton as shown in Fig. 3b [137]. Here a three order of magnitude increase in the effective nonlinear index was observed compared to that expected for a non-resonant dielectric, confirming theoretical preditions, and presenting an promising result for excitation of SPhPs by fourwave mixing [132].…”
Section: Sphp Based Nonlinear Sourcessupporting
confidence: 77%
See 1 more Smart Citation
“…Moreover strong third-order optical nonlinearities were also recently observed in SiC by measuring the self-phase modulation [143] of a propagative surface phonon polariton as shown in Fig. 3b [137]. Here a three order of magnitude increase in the effective nonlinear index was observed compared to that expected for a non-resonant dielectric, confirming theoretical preditions, and presenting an promising result for excitation of SPhPs by fourwave mixing [132].…”
Section: Sphp Based Nonlinear Sourcessupporting
confidence: 77%
“…Mid-infrared light could be generated either through difference frequency generation [129,130], or through four-wave mixing in an optical parametric oscillator [131,132]. Although generation of SPhPs is yet to be demonstrated polar dielectrics are known to have strongly resonant second (χ (2) ) and third (χ (3) ) order nonlinear susceptibilities around their optical phonon frequencies [133][134][135][136][137]. Moreover, nonlinear processes have been investigated in the mid-infrared, when all photon frequencies lie in the neighbourhood of the optical phonons.…”
Section: Sphp Based Nonlinear Sourcesmentioning
confidence: 99%
“…Surface phonon polaritons (SPhPs) are hybrid lightmatter excitations, formed when a photon interacts with the optical phonon modes of a polar lattice. Like plasmons in the visible spectral region they allow for miniaturisation of photonic resonators below the diffraction limit [1], with applications in mid-infrared sensing [2], nonlinear optics [3][4][5] and the design of thermal emitters [6][7][8][9] . In a simple model of polar optics the lattice is considered to be non-dispersive, and is described by a frequencydependant dielectric function parameterised by the optical phonon frequencies at zone-centre.…”
Section: Introductionmentioning
confidence: 99%
“…In the mid-infrared region this can be achieved by coupling light with the transverse optical phonons of a polar nanostructure, yielding hybrid light-matter excitations termed surface phonon polaritons (SPhPs) [3][4][5]. These modes are highly tuneable [6][7][8][9][10] and have broad applications in nonlinear optics [11][12][13], near-field imaging [14,15], design of mid-infrared emitters [16] and fabrication of nanophotonic circuitry [17][18][19]. Due to their narrow linewidths and large field confinement SPhPs can be strongly coupled to a variety of other resonances present in nanostructured devices.…”
mentioning
confidence: 99%