Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons

Kozub, Agnieszka L.; Gerstmann, Uwe; Schmidt, Wolf Gero

doi:10.1002/pssb.202200453

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…According to waveguide analysis 38 , effective linear refractive 𝑛 0 is 2.99 at 0.63 THz. Accordingly, the nonlinear susceptibility is calculated to be larger than 1.57 × 10 −15 m 2 ⋅ V −2 at 0.63 THz, which represents a value over 4 orders of magnitude larger than that for visible light in LN 43 . Notably, in our experiment, THz waves are optimized to be z polarized, thus this result means Re(𝜒 𝑧𝑧𝑧𝑧 (3) ) > 1.57 × 10 −15 m 2 ⋅ V −2 , which also shows a nonlinear refractive index of 𝑛 2 > 9.94 × 10 −14 m 2 ⋅ W −1 .…”

Section: Resultsmentioning

confidence: 85%

Giant Kerr nonlinearity of terahertz waves mediated by stimulated phonon polaritons in a microcavity chip

Wu,

Huang,

et al. 2023

Preprint

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Optical Kerr effect, in which input light intensity linearly alters the refractive index, has enabled the generation of optical solitons, supercontinuum spectra, and frequency combs, playing vital roles in the on-chip devices, fiber communications, and quantum manipulations. Especially, terahertz Kerr effect, featuring fascinating prospects in future high-rate computing, artificial intelligence, and cloud-based technologies, encounters a great challenge due to the rather low power density and feeble Kerr response. Here, we demonstrate a giant terahertz frequency Kerr nonlinearity mediated by stimulated phonon polaritons. Under the influences of the giant Kerr nonlinearity, the power-dependent refractive index change would result in a frequency shift in the microcavity, which was experimentally demonstrated via the measurement of the resonant mode of a chip-scale lithium niobate Fabry-Pérot microcavity. Attributed to the existence of stimulated phonon polaritons, the nonlinear coefficient extracted from the frequency shifts are orders of magnitude larger than that of visible and infrared light, which is also theoretically demonstrated by nonlinear Huang equations. This work opens an avenue for many rich and fruitful terahertz Kerr effect based physical, chemical, and biological systems that have terahertz fingerprints.

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Section: Resultsmentioning

confidence: 85%

Giant Kerr nonlinearity of terahertz waves mediated by stimulated phonon polaritons in a microcavity chip

Wu,

Huang,

et al. 2023

Preprint

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Integration of Open Metal Sites in an Amino-Functionalized Sm(III)–Organic Framework toward Enhanced Third-Order Nonlinear Optical Property

Abazari,

Sanati,

Nadafan

et al. 2024

Inorg. Chem.

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A variety of new inorganic and organic materials have emerged to advance laser technologies and optical engineering. A rational design approach can contribute significantly to fabricating nonlinear optically active metal−organic frameworks (MOFs) by considering the underlying structure−property linkage. Here, it has been embarked on a study of novel samarium(III) MOF, ([Sm 2 (ata) 3 (DMF) 4 ]•DMF (ata 2− : 2aminoterephthalate), abbreviated as NH 2 -Sm-MUM-4) with enhanced nonlinear optical (NLO) properties. The crystal structure of this MOF represents a 6-connected framework with a pcu topology and distinctive characteristics, including open metal sites, free amine groups, and great stability, making it suitable for third-order NLO activity. The nonlinear index of refraction (n 2 ) revealed the self-focusing impacts of NH 2 -Sm-MUM-4 at different incident intensities. The highest value of n 2 and β related to 10 mw power of incident intensity are 5.15 cm 2 /W and 2.65 cm/W, respectively. As far as the authors know, this is the first study examining the potential systematic structural−property associations in Sm-MOFs considering improved third-order NLO properties.

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Giant Kerr nonlinearity of terahertz waves mediated by stimulated phonon polaritons in a microcavity chip

Huang,

Lu,

et al. 2024

Light Sci Appl

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Optical Kerr effect, in which input light intensity linearly alters the refractive index, has enabled the generation of optical solitons, supercontinuum spectra, and frequency combs, playing vital roles in the on-chip devices, fiber communications, and quantum manipulations. Especially, terahertz Kerr effect, featuring fascinating prospects in future high-rate computing, artificial intelligence, and cloud-based technologies, encounters a great challenge due to the rather low power density and feeble Kerr response. Here, we demonstrate a giant terahertz frequency Kerr nonlinearity mediated by stimulated phonon polaritons. Under the influences of the giant Kerr nonlinearity, the power-dependent refractive index change would result in a frequency shift in the microcavity, which was experimentally demonstrated via the measurement of the resonant mode of a chip-scale lithium niobate Fabry-Pérot microcavity. Attributed to the existence of stimulated phonon polaritons, the nonlinear coefficient extracted from the frequency shifts is orders of magnitude larger than that of visible and infrared light, which is also theoretically demonstrated by nonlinear Huang equations. This work opens an avenue for many rich and fruitful terahertz Kerr effect based physical, chemical, and biological systems that have terahertz fingerprints.

show abstract

Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons

Cited by 5 publications

References 26 publications

Giant Kerr nonlinearity of terahertz waves mediated by stimulated phonon polaritons in a microcavity chip

Giant Kerr nonlinearity of terahertz waves mediated by stimulated phonon polaritons in a microcavity chip

Integration of Open Metal Sites in an Amino-Functionalized Sm(III)–Organic Framework toward Enhanced Third-Order Nonlinear Optical Property

Giant Kerr nonlinearity of terahertz waves mediated by stimulated phonon polaritons in a microcavity chip

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