Harmonic generation in a nematic liquid crystal

Trashkeev, S. I.; Vasenin, N. T.; Vatnik, S. M.; Vedin, I A; Ivanenko, Aleksey; Klementyev, V. M.

doi:10.1088/1612-202x/ab930f

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…At the same time, third harmonic generation (THG) and the THG microscopy is a well-known probe of biological tissues [4], metasurfaces [5,6] and nanostructures [7]. Both nonlinear optical probes of SHG and THG have been also used for the studies of nematic liquid crystals [8]. In general, nonlinear * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Third harmonic generation microscopy of magnetic domains in garnet films

Maydykovskiy,

Popov,

Murzina

2024

Laser Phys. Lett.

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Nonlinear optical microscopy is a powerful non-destructive technique that allows to study a wide range of phenomena. Optical third harmonic generation (THG) is mostly known by its applications in investigation of biological structures, while magneto-optical effects in THG are not well recognized. Here we demonstrate high efficiency of the THG probe in studies of magnetic domain structure of epitaxial garnet films. We show that in spite of relatively small values of the magneto-optical effect at the THG wavelength, the THG microscopy may be efficient for the characterization of magnetic surface domains if the THG wavelength falls in the absorption band of a medium. Moreover, the in-depth sensitivity of this probe may be higher as compared to the case of the second harmonic generation microscopy.

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Section: Introductionmentioning

confidence: 99%

Third harmonic generation microscopy of magnetic domains in garnet films

Maydykovskiy,

Popov,

Murzina

2024

Laser Phys. Lett.

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“…When an electromagnetic wave propagates through a doped NLC, it experiences a perturbation that manifests as the potential of the medium [36,37]. Nematic liquid crystals with high birefringence and low frequency dispersion are appropriate nonlinear optical materials to meet the phase-matching requirements for the generation of higher harmonics [38][39][40]. Harmonic generation has a wide range of applications in the fields from modern photonics to the spectroscopy and microscopy of matter.…”

Section: Introductionmentioning

confidence: 99%

“…Harmonic generation has a wide range of applications in the fields from modern photonics to the spectroscopy and microscopy of matter. It paves the way for access to previously inaccessible spectral ranges, as well as the development of novel solid-state spectroscopy and microscopy techniques that allow detailed probing of the electronic structure of solids [38,39,41,42].…”

Section: Introductionmentioning

confidence: 99%

The effect of parabolic potential on the generation of higher harmonics of nematicons

Sajitha

Suneera

2023

Phys. Scr.

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We investigate the behavior of nonlocal spatial optical solitons in auniaxial nematic liquid crystal with a parabolic potential. The equations governingthe system are solved using semi-analytic and numerical methods. We found thatnematicons exist in the parabolic potential. These nematicons exhibit periodicoscillations in the presence of the parabolic potential. The wavelength of periodicoscillations was found to decrease linearly with increasing potential strength. Higherharmonics of nematicons can be generated by varying the strength of the parabolicpotential. Using Bogoliobov-De-Genes equations, the stability of the stationarysolution against small perturbation has been investigated.

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High-order harmonic generation in liquid crystals

Annunziata,

Becker,

Murillo-Sánchez

et al. 2024

APL Photonics

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Thermotropic liquid crystals are versatile optical materials that exhibit a state of matter intermediate between liquids and solids. Their properties can change significantly with temperature, pressure, or other external factors, leading to different phases. The transport properties within these materials in different phases are still largely unexplored, and their understanding would enable exciting prospects for innovative technological advancements. High-order harmonic spectroscopy proved to be a powerful spectroscopic tool for investigating the electronic and nuclear dynamics in matter. Here, we report the first experimental observation of high-order harmonic generation in thermotropic liquid crystals in two different phase states, nematic and isotropic. We found the harmonic emission in the nematic phase to be strongly dependent on the relative orientation of the driving field polarization with respect to the liquid crystal alignment. Specifically, the harmonic yield has a maximum when the molecules are aligned perpendicularly to the polarization of the incoming radiation. Our results establish the first step for applying high-order harmonic spectroscopy as a tool for resolving ultrafast electron dynamics in liquid crystals with unprecedented temporal and spatial resolution.

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Harmonic generation in a nematic liquid crystal

Cited by 4 publications

References 19 publications

Third harmonic generation microscopy of magnetic domains in garnet films

Third harmonic generation microscopy of magnetic domains in garnet films

The effect of parabolic potential on the generation of higher harmonics of nematicons

High-order harmonic generation in liquid crystals

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