Second harmonic generation at a time-varying interface [PDF]
Nature CommunicationsTime-varying metamaterials rely on large and fast changes of the linear permittivity. Beyond the linear terms, however, the effect of a non-perturbative modulation of the medium on harmonic generation remains largely unexplored.
Romain Tirole +8 more
doaj +4 more sources
Interlayer exciton mediated second harmonic generation in bilayer MoS2 [PDF]
Nature Communications, 2021 Efficient second-harmonic generation (SHG) occurs for crystals with broken inversion symmetry, such as transition metal dichalcogenide monolayers. Here the authors show SHG tuning in bilayer MoS2 - an inversion-symmetric crystal - mediated by interlayer ...
Shivangi Shree +12 more
doaj +2 more sources
Resonantly enhanced second- and third-harmonic generation in dielectric nonlinear metasurfaces
Opto-Electronic AdvancesNonlinear dielectric metasurfaces provide a promising approach to control and manipulate frequency conversion optical processes at the nanoscale, thus facilitating both advances in fundamental research and the development of new practical applications in
Nicolae-Coriolan Panoiu +2 more
exaly +2 more sources
Tunable Second Harmonic Generation in Twisted Bilayer Graphene
Matter, 2020 Summary Twisted stacking of van der Waals materials introduces a new way in band-structure engineering and has given rise to numerous extraordinary physical phenomena.
Fuyi Yang, Wenshen Song, Li Yang
exaly +2 more sources
Metasurface-assisted phase-matching-free second harmonic generation in lithium niobate waveguides [PDF]
Nature Communications, 2017 Phase matching is a crucial condition for nonlinear optical processes. Here, Wang et al. demonstrate that a gradient metasurface composed of phased array antennas allows phase-matching-free frequency conversion over a pump wavelength range of almost 100 ...
Cheng Wang +7 more
doaj +2 more sources
Second harmonic generation in modal phase-matched AlGaAs-on-insulator waveguides [PDF]
EPJ Web of Conferences, 2023 We utilize modal phase matching and type-I configuration to achieve second harmonic generation in AlGaAs-on-insulator waveguides. We demonstrate an overall normalized conversion efficiency of 200% W-1 cm-2 at a pump wavelength of 1587 nm in a 1-mm-long ...
Lu Xinda +4 more
doaj +1 more source
All-optical polarization and amplitude modulation of second-harmonic generation in atomically thin semiconductors [PDF]
Nature Photonics, 2021 Second-harmonic generation is of paramount importance in several fields of science and technology, including frequency conversion, self-referencing of frequency combs, nonlinear spectroscopy and pulse characterization.
Sebastian Klimmer +6 more
semanticscholar +1 more source
Resonant Second-Harmonic Generation as a Probe of Quantum Geometry. [PDF]
Physical Review Letters, 2021 Nonlinear responses are actively studied as probes of topology and band geometric properties of solids. Here, we show that second harmonic generation serves as a probe of the Berry curvature, quantum metric, and quantum geometric connection.
Pankaj Bhalla +3 more
semanticscholar +1 more source
Second harmonic generation microscopy: a powerful tool for bio-imaging
Biophysical Reviews, 2023 Second harmonic generation (SHG) microscopy is an important optical imaging technique in a variety of applications. This article describes the history and physical principles of SHG microscopy and its more advanced variants, as well as their strengths ...
Arash Aghigh +5 more
semanticscholar +1 more source
In-fibre second-harmonic generation with embedded two-dimensional materials
Nature Photonics, 2022 Silica-based optical fibres are a workhorse of nonlinear optics, providing ready access to a range of nonlinear phenomena including solitons and self-phase modulation.
G. Q. Ngo +14 more
semanticscholar +1 more source