Probing nonlinear optical coefficients in self-assembled peptide nanotubes

2017 ◽  
Vol 19 (4) ◽  
pp. 3084-3093 ◽  
Author(s):  
Soma Khanra ◽  
Kartik Ghosh ◽  
Fabio F. Ferreira ◽  
Wendel A. Alves ◽  
Francesco Punzo ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Peptide Nanotubes ◽  
Self Assembled ◽  
Individual Self

Second harmonic generation polarimetry from individual self-assembled peptide nanotubes is used to obtain the ratio of the nonlinear coefficients.

In Situ Second Harmonic Generation Measurements of the Growth of Nonlinear Optical Ionically Self-Assembled Monolayers

2000 ◽  
Vol 660 ◽  
Author(s):  
C. Brands ◽  
P.J. Neyman ◽  
M.T. Guzy ◽  
S. Shah ◽  
K.E. Van Cott ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Self Assembled Monolayers ◽  
Optical Polymer ◽  
Wide Range ◽  
Assembled Monolayers ◽  
Self Assembled

ABSTRACTIonically self-assembled monolayers (ISAMs) have recently been shown to spontaneously exhibit a polar ordering that gives rise to a substantial second order nonlinear optical (NLO) response. Here, the deposition of ISAMs has been studied in situ via second harmonic generation (SHG). We show that the adsorption and ordering of a noncentrosymmetric nonlinear optical polymer is constant over a wide range of concentrations. Upon immersion in the NLO-active polyelectrolyte solution, the SHG rises sharply over the first minute. Immersion in the NLO-inactive partner polyelectrolyte leads to a reduction in the SHG signal. Furthermore, when the film is removed from the NLO-active solution and allowed to dry, the SHG increases rapidly as the water evaporates. These studies provide greater understanding of the processes by which noncentrosymmetric order is formed in ISAM films and allows design of improved self- assembled nonlinear optical materials.

scholarly journals Nonlinear optical responses of self-assembled monolayers functionalized with indolino–oxazolidine photoswitches

2018 ◽  
Vol 20 (33) ◽  
pp. 21590-21597 ◽  
Author(s):  
Claire Tonnelé ◽  
Kornelia Pielak ◽  
Jean Deviers ◽  
Luca Muccioli ◽  
Benoît Champagne ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Self Assembled Monolayers ◽  
Optical Responses ◽  
Assembled Monolayers ◽  
Self Assembled

The second harmonic generation responses of photoresponsive self-assembled monolayers based on indolino–oxazolidine derivatives are computed using a sequential MD/DFT approach.

Preparation and Second-Harmonic Generation Properties of a Self-Assembled Multilayer Film Based on Nanoporous Isopolyoxomolybdate and Bipolar Hemicyanine

2008 ◽  
Vol 8 (3) ◽  
pp. 1355-1358 ◽  
Author(s):  
Li-Hua Gao ◽  
Xiao-Juan Hu ◽  
De-Sheng Zheng ◽  
Yuan Guo ◽  
Ke-Zhi Wang
Keyword(s):  
Second Harmonic Generation ◽  
Film Thickness ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Multilayer Film ◽  
Second Harmonic ◽  
Square Roots ◽  
Self Assembled ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

An electrostatic self-assembled multilayer film has successfully been prepared by alternating adsorption of a wheel-shaped nanoporous isopolyoxomolybdate and a bipolar hemicyanine derivative, as monitored by absorption spectroscopy. The square roots of second-harmonic intensities of the film exhibit quadratic dependence on film thickness up to 10 layers. The average titled angle of the nonlinear optical chromophores to the substrate normal is derived to be 34° by polarized second-harmonic generation measurements.

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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