scholarly journals Second harmonic generation theory for a helical macromolecule with high sensitivity to structural disorder

2021 ◽  
Author(s):  
Darius Abramavicius ◽  
Serguei Krouglov ◽  
Virginijus Barzda
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Molecular System ◽  
Microscopic Theory ◽  
High Sensitivity ◽  
Structural Disorder ◽  
Minimal Coupling ◽  
Generation Theory ◽  
Non Local

Microscopic theory for the second harmonic generation in a helical molecular system is developed in the minimal coupling representation including non-local interaction effects. At the second order to the field...

scholarly journals Interface Driven Effects in Magnetization-Induced Optical Second Harmonic Generation in Layered Films Composed of Ferromagnetic and Heavy Metals

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3573
Author(s):  
Evgeniy Mamonov ◽  
Irina Kolmychek ◽  
Victoria Radovskaya ◽  
Igor Pashen’kin ◽  
Nikita Gusev ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Experimental Studies ◽  
High Sensitivity ◽  
Magnetization Distribution ◽  
Optical Second Harmonic Generation ◽  
Optical Effects ◽  
Non Local ◽  
The Magnetic Field

Properties of nanolayers can substantially differ from those of bulky materials, in part due to pronounced interface effects. It is known that combinations of layers of heavy and ferromagnetic metals leads to the appearance of specific spin textures induced by interface-induced Dzyaloshinskyi–Moria interaction (DMI), which attracts much interest and requires further studies. In this paper, we study magneto-optical effects in two- and three-layer films composed of a few nanometer thick Co layer adjacent to nanofilms of non-magnetic materials (Pt, W, Cu, Ta, MgO). For experimental studies of the interface magnetization-induced effects, we used the optical second harmonic generation (SHG) technique known for its high sensitivity to the symmetry breaking. We found that the structural asymmetry leads to the increase of the averaged SHG intensity, as well as to the magnetic field-induced effects in SHG. Moreover, by choosing the proper geometry of the experiment, we excluded the most studied linear in magnetization SHG contributions and, thus, succeeded in studying higher order in magnetization and non-local magnetic effects. We revealed odd in magnetization SHG effects consistent with the phenomenological description involving inhomogeneous (gradient) magnetization distribution at interfaces and found them quite pronounced, so that they should be necessarily taken into account when analyzing the non-linear magneto-optical response of nanostructures.

scholarly journals Second harmonic generation correlation spectroscopy for characterizing translationally diffusing protein nanocrystals

2016 ◽  
Vol 72 (7) ◽  
pp. 849-859
Author(s):  
Ximeng Y. Dow ◽  
Christopher M. Dettmar ◽  
Emma L. DeWalt ◽  
Justin A. Newman ◽  
Alexander R. Dow ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Unit Volume ◽  
Second Harmonic ◽  
Incident Beam ◽  
High Sensitivity ◽  
Correlation Spectroscopy ◽  
Optical Process ◽  
Active Nanoparticles ◽  
Low Sensitivity

Second harmonic generation correlation spectroscopy (SHG-CS) is demonstrated as a new approach to protein nanocrystal characterization. A novel line-scanning approach was performed to enable autocorrelation analysis without sample damage from the intense incident beam. An analytical model for autocorrelation was developed, which includes a correction for the optical scattering forces arising when focusing intense, infrared beams. SHG-CS was applied to the analysis of BaTiO3nanoparticles ranging from 200 to ∼500 nm and of photosystem I nanocrystals. A size distribution was recovered for each sample and compared with the size histogram measured by scanning electron microscopy (SEM). Good agreement was observed between the two independent measurements. The intrinsic selectivity of the second-order nonlinear optical process provides SHG-CS with the ability to distinguish well ordered nanocrystals from conglomerates and amorphous aggregates. Combining the recovered distribution of particle diameters with the histogram of measured SHG intensities provides the inherent hyperpolarizability per unit volume of the SHG-active nanoparticles. Simulations suggest that the SHG activity per unit volume is likely to exhibit relatively low sensitivity to the subtle distortions within the lattice that contribute to resolution loss in X-ray diffraction, but high sensitivity to the presence of multi-domain crystals.

Studying the Interplay of Electric and Magnetic Resonance-Enhanced Second Harmonic Generation: Theory and Experiments

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
Rohith Chandrasekar ◽  
Naresh K. Emani ◽  
Alexei Lagutchev ◽  
Vladimir M. Shalaev ◽  
Cristian Ciraci ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Generation Theory ◽  
Theory And Experiments

Hydrodynamic study of surface plasmon enhanced non-local second-harmonic generation

1996 ◽  
Vol 64 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Hans Riis Jensen ◽  
Raymond Reinisch ◽  
Jean Louis Coutaz
Keyword(s):  
Second Harmonic Generation ◽  
Surface Plasmon ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Hydrodynamic Study ◽  
Non Local
Sign in / Sign up

Export Citation Format

Share Document