Results 21 to 30 of about 12,216 (264)
Second harmonic generation from the `centrosymmetric' crystals
IUCrJ, 2015 Second harmonic generation (SHG) is a well known non-linear optical phenomena which can be observed only in non-centrosymmetric crystals due to non-zero hyperpolarizability.
Venkatram Nalla +6 more
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Second-Harmonic Generation of the Vortex Beams with Integer and Fractional Topological Charges
Photonics, 2023 The single-pass second-harmonic generation (SHG) of a vortex beam under low fundamental wave depletion is systematically studied. Vortex modes at 1064 nm with integer topological charges from ±1 to ±9 and fractional ones at ±0.75 are generated by ...
Shirui Zhang +5 more
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Results in Physics, 2016 In this paper, we present the direct-substitution (DS) method to study the second-harmonic generation (SHG) in arbitrary one-dimensional optical superlattices (OS).
Ying Chen, Xiangbo Yang
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Scientific Reports, 2023 Strong second harmonic generation (SHG) in silicon nitride has been extensively studied—among others, in terms of laser-induced SHG enhancement in Si3N4 waveguides.
Jakub Lukeš +5 more
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Insights into second-harmonic generation mechanisms in plasmonic nanostructures: Interplay between surface and bulk contributions [PDF]
APL PhotonicsThe origin of second-harmonic generation (SHG) in centrosymmetric materials, such as plasmonic metals, remains a subject of long-standing debate. In this work, the relative roles of local surface- and nonlocal bulk-induced nonlinear sources in the SHG of
E. Buhara, S. Boroviks, O. J. F. Martin
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EPJ Applied Metamaterials, 2022 Metasurface consisting of square array of obtuse isosceles triangle metaatoms is found to exhibit much more efficient second harmonic generation (SHG) compared to that of split ring resonators and its heptagonal modification, experimentally as well as ...
Habibullah Yusuf B., Ishihara Teruya
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PLoS ONE, 2018 BackgroundAssessment of severity of liver fibrosis is essential in the management of non-alcoholic fatty liver disease (NAFLD). Second Harmonic Generation (SHG) microscopy is a novel optical tissue imaging system that provides automated quantification of
Pik Eu Chang +5 more
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Optical Signature of Moiré Superlattices Formed by Twisted SrTiO3 Membranes
Advanced Functional Materials, EarlyView.We discover optical signatures from bonded interfaces in twisted SrTiO3 moiré superlattices, including low‐frequency Raman vibrational modes and strong second‐harmonic generation, consistent with strong interlayer coupling inferred from cross‐sectional electron microscopy and ab initio calculations. ABSTRACT Moiré superlattices formed at the interfaces
T. A. M. Ragib Shahriar +13 more
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Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms
Micromachines, 2020 Metasurfaces of gold (Au) nanoparticles on a SiO2-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off.
Kanta Mochizuki +8 more
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Advanced Functional Materials, EarlyView.Photoaligned and photopatterned liquid crystal platforms provide programmable control of optical phase, polarization, and spin‐orbit interactions, enabling compact generation of structured light and complex wavefronts. This review highlights how tailored molecular orientations transform simple beams into designed optical fields, opening versatile ...
Le Zhou +6 more
wiley +1 more source