Probing the dielectric property of organic molecules at solid–liquid interfaces using reflection second harmonic generation

2000 ◽  
Vol 445 (2-3) ◽  
pp. L65-L70 ◽  
Author(s):  
Zhi Xu ◽  
Ying Dong
Keyword(s):  
Dielectric Property ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Organic Molecules ◽  
Second Harmonic ◽  
Liquid Interfaces ◽  
Solid Liquid

scholarly journals Second Harmonic Generation for Moisture Monitoring in Dimethoxyethane at a Gold-Solvent Interface Using Plasmonic Structures

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1788
Author(s):  
Hannah Aharon ◽  
Omer Shavit ◽  
Matan Galanty ◽  
Adi Salomon
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Gold Electrode ◽  
Second Harmonic ◽  
Liquid Interfaces ◽  
Metal Interface ◽  
Liquid Electrode ◽  
Plasmonic Structures ◽  
Electrode Interface ◽  
Solid Liquid

Second harmonic generation (SHG) is forbidden from most bulk metals because metals are characterized by centrosymmetric symmetry. Adsorption or desorption of molecules at the metal interface can break the symmetry and lead to SHG responses. Yet, the response is relatively low, and minute changes occurring at the interface, especially at solid/liquid interfaces, like in battery electrodes are difficult to assess. Herein, we use a plasmonic structure milled in a gold electrode to increase the overall SHG signal from the interface and gain information about small changes occurring at the interface. Using a specific homebuilt cell, we monitor changes at the liquid/electrode interface. Specifically, traces of water in dimethoxyethane (DME) have been detected following changes in the SHG responses from the plasmonic structures. We propose that by plasmonic structures this technique can be used for assessing minute changes occurring at solid/liquid interfaces such as battery electrodes.

SECOND HARMONIC GENERATION IN Λ-SHAPED ORGANIC MOLECULES

2008 ◽  
Vol 17 (03) ◽  
pp. 329-338 ◽  
Author(s):  
MALYAJ DAS ◽  
RASHMI TRIVEDI ◽  
B. Q. KHATTAK ◽  
P. RAMSHANKAR ◽  
PRATIMA SEN ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Organic Molecules ◽  
Second Harmonic ◽  
Theoretical Calculations ◽  
Geometry Optimization ◽  
Polymer Chains ◽  
Diphenyl Sulfone ◽  
Active Moiety ◽  
Nlo Materials

In epoxy based polymeric nonlinear optical (NLO) materials, the nonlinear optically active moiety forms crosslink between polymer chains. Some of the important moieties include 4, 4'diamino diphenyl sulfone (DADS). We have examined second harmonic generation (SHG) in DADS and have compared it with 4, 4'diamino diphenyl methane (DADM). The geometry optimization suggests that both molecules have Λ-shaped structure. The theoretical calculations as well as experimental observations of SHG in both the molecules suggest the suitability of DADS over DADM for making polymeric NLO materials.

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