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Bioinspired second harmonic generation
SPIE Proceedings, 2017Second harmonic generation (SHG) is a microscopic technique applicable to a broad spectrum of biological and medical imaging due to its excellent photostability, high signal-to-noise ratio (SNR) and narrow emission profile. Current SHG microscopy techniques rely on two main contrast modalities.
Ali Y. Sonay, Periklis Pantazis
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Optical Second Harmonic Generation Chiral Spectroscopy
ChemPhysChem, 2009AbstractChiral spectroscopic study: The intensities of second harmonic generation chiral spectroscopy are obtained from the dispersion of the nonlinear optical susceptibility components, as a function of wavelength for helicenbisquinone thin films (see figure).
Stijn, Foerier +4 more
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Second-harmonic generation in AlGaAs nanoantennas
Photonics and Fiber Technology 2016 (ACOFT, BGPP, NP), 2016We demonstrate monolithic aluminum gallium arsenide (AlGaAs) optical nanoantennas for enhanced second harmonic generation (SHG) at telecom wavelengths. From measurements on nanocylinders of 400 nm height and varying radius pumped with femtosecond pulses delivered at 1554-nm wavelength, we estimated a peak conversion efficiency exceeding 10−5.
DE ANGELIS, Costantino +11 more
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1991
In optical second-harmonic generation coherent optical radiation of frequency 2ω is generated, through the use of a medium with the appropriate nonlinear susceptibility, from incident coherent optical radiation of frequency ω. For the process to take place efficiently, the phase matching condition (colinear geometry) $$ k(2\omega ) = 2k(\omega ) $$
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In optical second-harmonic generation coherent optical radiation of frequency 2ω is generated, through the use of a medium with the appropriate nonlinear susceptibility, from incident coherent optical radiation of frequency ω. For the process to take place efficiently, the phase matching condition (colinear geometry) $$ k(2\omega ) = 2k(\omega ) $$
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Polarization-vortex-driven second-harmonic generation
Optics Letters, 2003Polarization vortices exist in the focus of a class of vector beams, the lowest order of which possess full vector symmetry about the axis of propagation of the beam. At high numerical apertures these beams are known to exhibit large, local, longitudinal fields in the focal region.
D P, Biss, T G, Brown
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Second-harmonic generation imaging of cancer
2014The last 30 years has seen great advances in optical microscopy with the introduction of sophisticated fluorescence-based imaging methods such as confocal and multiphoton laser scanning microscopy. There is increasing interest in using these methods to quantitatively examine sources of intrinsic biological contrast including autofluorescent endogenous ...
Adib, Keikhosravi +3 more
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Diagrammatic representation of second harmonic generation
Applied Optics, 1988Application de la theorie electrodynamique des perturbations conduisant a une representation diagrammatique du ...
W E, Parry, R R, Syms
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Second-Harmonic Generation Devices
2003The simplest and most fundamental waveguide NLO device is a waveguide second-harmonic generation (SHG) devices, where the frequency of the input pump wave is doubled to generate a second-harmonic output wave. They are a prototype of various waveguide NLO devices, and most of the important elementary device techniques for all waveguide NLO devices have ...
Toshiaki Suhara, Masatoshi Fujimura
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Second-Harmonic Generation Imaging
2000Three-dimensional second-harmonic generation imaging using femtosecond pulses is demonstrated. Since second-harmonic generation results from coupling of the optical field to the second-order nonlinearity of the specimen, SHGI is a probe of local anisotropy and the distribution of molecular hyperpolarisability.
R. Gauderon +2 more
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Second-harmonic generation of polarization singularities
Optics Letters, 2002Second-harmonic generation was studied theoretically for the vector singularities (daisy modes) of linearly polarized light and for the elliptic singularities (C points) of elliptically polarized light. Topological charge doubling for C points and daisy modes, similar to that found for vortices, was found.
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