scholarly journals Dispersion of the nonlinear susceptibility of MoS2 and WS2 from second-harmonic scattering spectroscopy

2020 ◽  
Vol 102 (23) ◽  
Author(s):  
Kévin Bredillet ◽  
Jérémy Riporto ◽  
Gregory T. Forcherio ◽  
Jeremy R. Dunklin ◽  
Jean-Pierre Wolf ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Nonlinear Susceptibility ◽  
Second Harmonic Scattering

scholarly journals Hyaluronan orders water molecules in its nanoscale extended hydration shells

2021 ◽  
Vol 7 (10) ◽  
pp. eabf2558
Author(s):  
J. Dedic ◽  
H. I. Okur ◽  
S. Roke
Keyword(s):  
Second Harmonic ◽  
Hydration Shell ◽  
Water Molecules ◽  
Temperature Dependent ◽  
Flexible Chain ◽  
Optical Modeling ◽  
Hydration Shells ◽  
Second Harmonic Scattering ◽  
Nuclear Quantum Effects ◽  
Extracellular Environment

Hyaluronan (HA) is an anionic, highly hydrated bio-polyelectrolyte found in the extracellular environment, like the synovial fluid between joints. We explore the extended hydration shell structure of HA in water using femtosecond elastic second-harmonic scattering (fs-ESHS). HA enhances orientational water-water correlations. Angle-resolved fs-ESHS measurements and nonlinear optical modeling show that HA behaves like a flexible chain surrounded by extended shells of orientationally correlated water. We describe several ways to determine the concentration-dependent size and shape of a polyelectrolyte in water, using the amount of water oriented by the polyelectrolyte charges as a contrast agent. The spatial extent of the hydration shell is determined via temperature-dependent measurements and can reach up to 475 nm, corresponding to a length of 1600 water molecules. A strong isotope effect, stemming from nuclear quantum effects, is observed when light water (H2O) is replaced by heavy water (D2O), amounting to a factor of 4.3 in the scattered SH intensity.

Enhancement of second harmonic generation using a novel asymmetric metal–graphene–insulator–metal plasmonic waveguide

2018 ◽  
Vol 27 (01) ◽  
pp. 1850003 ◽  
Author(s):  
Mohamadreza Soltani
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Field Enhancement ◽  
The Other ◽  
Nonlinear Susceptibility ◽  
Optical Process ◽  
Large Enhancement ◽  
Nonlinear Optical Process

Here, we propose a novel plasmonic structure, called asymmetric plasmonic nanocavity grating (APNCG), which is shown to dramatically enhance nonlinear optical process of second harmonic generation (SHG). The proposed structure consists of two different metals on both sides of lithium niobate and a thin layer of graphene. By using two different metals the nonlinear susceptibility of the waveguide would be increased noticeably causing to increase SHG. On the other hand, it consists of two identical gratings on one side. By two identical gratings, the pump beam is coupled to two opposing SPP waves, which interfere with each other and result in SPP standing wave in the region between the two gratings. The distance between two gratings will be optimized to reach the highest SHG. It will be shown that by optimizing the geometry of proposed structure and using different metals, field enhancement in APNCG waveguides can result in large enhancement of SHG.

scholarly journals A Molecular Architectural Approach to Second-Order Nonlinear Optical Materials

1995 ◽  
Vol 392 ◽  
Author(s):  
Xiaoguang Yang ◽  
Duncan McBranch ◽  
Basil Swanson ◽  
Dequan Li
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Fused Silica ◽  
Second Order ◽  
Nonlinear Susceptibility ◽  
Design And Synthesis ◽  
Fundamental Wavelength ◽  
Assembled Monolayers ◽  
Methylene Groups ◽  
Nlo Chromophores

AbstractThe design and synthesis of a family of calix[4]arene-based nonlinear optical (NLO) chromophores are discussed. The calixarene chromophores are macrocyclic compounds consisting of four simple D-π-A units bridged by methylene groups. These molecules were synthesized such that four D-π-A units of the calix[4]arene were aligned along the same direction with the calixarene in a cone conformation. These nonlinear optical super-chromophores were subsequently fabricated into covalently bound self-assembled monolayers on the surfaces of fused silica and silicon. Spectroscopic second harmonic generation (SHG) measurements were carried out to determine the absolute value of the dominant element of the second-order nonlinear susceptibility, d33, and the average molecular alignment, ψ. We find a value of d33 = 60 pm/V at a fundamental wavelength of 890 nm, and ψ˜ 36° with respect to the surface normal.

scholarly journals Second-Harmonic Scattering as a Probe of Structural Correlations in Liquids

2016 ◽  
Vol 7 (21) ◽  
pp. 4311-4316 ◽  
Author(s):  
Gabriele Tocci ◽  
Chungwen Liang ◽  
David M. Wilkins ◽  
Sylvie Roke ◽  
Michele Ceriotti
Keyword(s):  
Second Harmonic ◽  
Second Harmonic Scattering

Optical second-harmonic scattering in rat-tail tendon

Biopolymers ◽  
1981 ◽  
Vol 20 (6) ◽  
pp. 1271-1290 ◽  
Author(s):  
Shmuel Roth ◽  
Isaac Freund
Keyword(s):  
Second Harmonic ◽  
Second Harmonic Scattering ◽  
Tail Tendon ◽  
Rat Tail

What Does Second-Harmonic Scattering Measure in Diluted Electrolytes?

2018 ◽  
Vol 9 (13) ◽  
pp. 3698-3702 ◽  
Author(s):  
Daniel Borgis ◽  
Luc Belloni ◽  
Maximilien Levesque
Keyword(s):  
Second Harmonic ◽  
Second Harmonic Scattering

Resonant hyper-Raman and second-harmonic scattering in a CdS quantum-dot system

1996 ◽  
Vol 53 (4) ◽  
pp. R1721-R1724 ◽  
Author(s):  
A. V. Baranov ◽  
K. Inoue ◽  
K. Toba ◽  
A. Yamanaka ◽  
V. I. Petrov ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Second Harmonic ◽  
Cds Quantum Dot ◽  
Second Harmonic Scattering
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