10 November 2003 Utilizing coupled-oscillator photophysics to elaborate chromophores with exceptional molecular hyperpolarizabilities
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Abstract
The syntheses and electrooptic properties of a family of nonlinear optical chromophores are described. Typically, these species feature an ethyne-elaborated, highly polarizable porphyrinic component, and metal polypyridyl complexes that serve as integral donor and acceptor elements. The frequency dependence of the dynamic hyperpolarizability of a wide-range of these chromophores, that vary widely with respect to their electronic structure, was determined from hyper-Rayleigh light scattering (HRS) measurements carried out at fundamental incident irradiation wavelengths (λinc) of 830, 1064, and 1300 nm. These data show that: (i) Coupled oscillator photophysics and metal-mediated cross-coupling can be exploited to elaborate high βλ supermolecules that exhibit significant excited-state electronic communication between their respective pigment building blocks; (ii) High-stability metal polypyridyl compounds constitute an attractive alternative to electron releasing dialkyl- and diarylamino groups, the most commonly used donor moieties in a wide-range of established NLO dyes, and long-recognized to be the moiety that often limits the thermal stability of such compounds; (iii) This design strategy clearly enables ready elaboration of extraordinarily large βλ chromophores at telecommunication-relevant wavelengths; and (iv) Multiple charge-transfer (CT) transitions within a single chromophore can be designed to have transition dipole moments of the same or opposite sign; because the sign of the resonance enhancement factor is frequency dependent, appropriate engineering of the relative contributions of these CT states at a given wavelength provides a new means to regulate the magnitude of dynamic hyperpolarizabilities.
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H. Tetsuo Uyeda, Ivan R. Miloradovic, Yuxia Zhao, Kurt Wostyn, Inge Asselberghs, Koen J. Clays, Andre P. Persoons, Michael J. Therien, "Utilizing coupled-oscillator photophysics to elaborate chromophores with exceptional molecular hyperpolarizabilities", Proc. SPIE 5212, Linear and Nonlinear Optics of Organic Materials III, (10 November 2003); doi: 10.1117/12.508261; https://doi.org/10.1117/12.508261
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KEYWORDS
Chromophores

Rutherfordium

Ruthenium

Zinc

Nonlinear optics

Osmium

Metals

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