Nonlinear Optical Studies of Mixed π-Conjugated Polymer Multilayers by Second Harmonic Generation

1989 ◽  
Vol 173 ◽  
Author(s):  
H. Koezuka ◽  
T. Kurata ◽  
A. Tsumura ◽  
H. Fuchigami
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Layered Structure ◽  
Conjugated Polymer ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Studies ◽  
Harmonic Radiation ◽  
Second Harmonic Radiation ◽  
Maker Fringe

ABSTRACTThe structures of the mixed LB monolayers, composed of two different kinds of π-conjugated system, poly(3-hexylthiophene) (PHT) and pentacosa-10, 12-diynoic acid (DA), have been investigated mainly by a second harmonic generation (SHG) Maker fringe method. The mixed LB films partly contain a double-layered structure consisting of PHT and DA. The second harmonic radiation has been produced from slightly twisted PHT in the double layer. Both UV-polymerization of DA and successive heat-treatments enhanced the SHG intensities. The enhancement of the SHG intensities has been elucidated by the enlargement of the PHT twisting and the interaction between PHT and a newly formed π-conjugated system.

scholarly journals Laser second harmonic generation in a rippled density plasma in the presence of azimuthal magnetic field

2009 ◽  
Vol 27 (4) ◽  
pp. 719-724 ◽  
Author(s):  
U. Verma ◽  
A.K. Sharma
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Transverse Component ◽  
Azimuthal Magnetic Field ◽  
Harmonic Radiation ◽  
Potential Source ◽  
Oscillatory Velocity ◽  
Second Harmonic Radiation

AbstractThe strong azimuthal magnetic fields, observed in many laser plasma experiments, are shown to be a potential source of second harmonic generation. The laser imparts oscillatory velocity to electrons and exerts a longitudinal pondromotive force on them. This force in conjunction with the azimuthal magnetic field and density ripple produces a second harmonic current with significant transverse component. The latter produces resonant second harmonic radiation.

Terahertz radiation and second-harmonic generation from a single-component polar organic ferroelectric crystal

2018 ◽  
Vol 6 (35) ◽  
pp. 9330-9335 ◽  
Author(s):  
Uppari Venkataramudu ◽  
Chakradhar Sahoo ◽  
Solaiappan Leelashree ◽  
Mottamchetty Venkatesh ◽  
Damarla Ganesh ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Terahertz Radiation ◽  
Second Harmonic ◽  
Single Component ◽  
Ferroelectric Crystal ◽  
Harmonic Radiation ◽  
Second Harmonic Radiation

A single-component polar organic ferroelectric crystal produces THz and second-harmonic radiation.

Optical Second Harmonic Generation in CdxZn1−xS and the CdxZn1−xS:CdyZn1−yS Superlattice System

1991 ◽  
Vol 228 ◽  
Author(s):  
J. T. Mullins ◽  
T. Taguchi
Keyword(s):  
Optical Absorption ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Epitaxial Layers ◽  
Resonant Enhancement ◽  
Harmonic Radiation ◽  
Optical Second Harmonic Generation ◽  
Strained Layer Superlattices ◽  
Second Harmonic Radiation

ABSTRACTOptical second harmonic generation in epitaxial layers of CdxZn1−xS and CdxZn1−xS:ZnS and CdS:CdxZn1−xS strained layer superlattices which had been removed from their substrates has been investigated. Some evidence for resonant enhancement of the second order non-linear susceptibility has been found for one sample where the onset of optical absorption was at photon energies close to that of the second harmonic radiation.

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 In situ second-harmonic generation mediated photodynamic therapy by micelles co-encapsulating coordination nanoparticle and photosensitizer

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 52125-52132 ◽  
Author(s):  
Xuyang Zhou ◽  
Yang Chen ◽  
Jian Su ◽  
Xiaohe Tian ◽  
Yonghuang Luo ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Property A

NIR-PDT strategy was introduced by employing a nonlinear optical conveyor bearing strong second-harmonic generation (SHG) property. A biocompatible micellic system co-delivered the conveyor and photosensitizer for in situ NIR-PDT.

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