TY - JOUR
T1 - Nonlinear optical properties of X(C6H5)4 (X = B-, C, N+, P+)
T2 - A new class of molecules with a negative third-order polarizability
AU - Gieseking, Rebecca L.
AU - Ensley, Trenton R.
AU - Hu, Honghua
AU - Hagan, David J.
AU - Risko, Chad
AU - Van Stryland, Eric W.
AU - Brédas, Jean Luc
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/8/5
Y1 - 2015/8/5
N2 - Organic π-conjugated materials have been widely used for a variety of nonlinear optical (NLO) applications. Molecules with negative real components Re(γ) of the third-order polarizability, which leads to nonlinear refraction in macroscopic systems, have important benefits for several NLO applications. However, few organic systems studied to date have negative Re(γ) in the long wavelength limit, and all inorganic materials show positive nonlinear refraction in this limit. Here, we introduce a new class of molecules of the form X(C6H5)4, where X = B-, C, N+, and P+, that have negative Re(γ). The molecular mechanism for the NLO properties in these systems is very different from those in typical linear conjugated systems: These systems have a band of excited states involving single-electron excitations within the π-system, several of which have significant coupling to the ground state. Thus, Re(γ) cannot be understood in terms of a simplified essential-state model and must be analyzed in the context of the full sum-over-states expression. Although Re(γ) is significantly smaller than that of other commonly studied NLO chromophores, the introduction of a new molecular architecture offering the potential for a negative Re(γ) introduces new avenues of molecular design for NLO applications.
AB - Organic π-conjugated materials have been widely used for a variety of nonlinear optical (NLO) applications. Molecules with negative real components Re(γ) of the third-order polarizability, which leads to nonlinear refraction in macroscopic systems, have important benefits for several NLO applications. However, few organic systems studied to date have negative Re(γ) in the long wavelength limit, and all inorganic materials show positive nonlinear refraction in this limit. Here, we introduce a new class of molecules of the form X(C6H5)4, where X = B-, C, N+, and P+, that have negative Re(γ). The molecular mechanism for the NLO properties in these systems is very different from those in typical linear conjugated systems: These systems have a band of excited states involving single-electron excitations within the π-system, several of which have significant coupling to the ground state. Thus, Re(γ) cannot be understood in terms of a simplified essential-state model and must be analyzed in the context of the full sum-over-states expression. Although Re(γ) is significantly smaller than that of other commonly studied NLO chromophores, the introduction of a new molecular architecture offering the potential for a negative Re(γ) introduces new avenues of molecular design for NLO applications.
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U2 - 10.1021/jacs.5b04377
DO - 10.1021/jacs.5b04377
M3 - Article
AN - SCOPUS:84938873523
SN - 0002-7863
VL - 137
SP - 9635
EP - 9642
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 30
ER -