Premium
Centrosymmetric molecules for second harmonic generation
Author(s) -
Ashwell G. J.
Publication year - 1996
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19960080314
Subject(s) - second harmonic generation , monolayer , materials science , molecule , surface second harmonic generation , intermolecular force , charge (physics) , chemical physics , nonlinear optical , nanotechnology , crystallography , nonlinear system , optics , quantum mechanics , physics , chemistry , laser
The requirement of a non‐centrosymmetric structure for second harmonic generation (SHG) was until recently assumed necessarily to apply to te smallest building block, the molecule. However, non‐centrosymmetric aggregates of centrosymmetric molecules can exist, and their SHG properties are considered here. Derivatives of squaraines are taken as examples. Finally, the role of intermolecular charge transfer in Langmuir–Blodgett film‐forming materials for SHG—both within the monolayers and across the boundary—is discussed.