5 October 1995 Structure-function relationships of second hyperpolarizabilities in two-dimensional molecules
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Abstract
The enhancement of the third order susceptibilities (chi) (3) and second order molecular hyperpolarizabilites < (gamma) > in a series of covanlently stacked dimer and trimer macrocycles (SiPc and SiNc) was observed throught he phase conjugated signals from DFWM measurements at both 1064 and 532 nm. The FWHM of the phase conjugated signals at 532 nm is much smaller than those at 1064 nm and those of the reference compound CS2. The < (gamma) > values at both wavelengths as a function of number of the monomer units (n) have an approximate n3 dependence, differing only in the scaling constant. The origin of such enhancement is discussed and compared to those in 1D (pi) -conjugated systems.
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Lin X.Q. Chen, Braja K. Mandal, Bipin Bihari, Amit K. Sinha, Manohar Kamath, "Structure-function relationships of second hyperpolarizabilities in two-dimensional molecules", Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); doi: 10.1117/12.222819; https://doi.org/10.1117/12.222819
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