Design, synthesis, and characterization of new organic dendrimers with greatly enhanced two-photon absorption

Charles W. Spangler; Zhiyong Suo; Mikhail A. Drobizhev; Aliaksandr Karotki; Aleksander Rebane

doi:10.1117/12.453318

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14 February 2003 Design, synthesis, and characterization of new organic dendrimers with greatly enhanced two-photon absorption

Charles W. Spangler, Zhiyong Suo, Mikhail A. Drobizhev, Aliaksandr Karotki, Aleksander Rebane

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Proceedings Volume 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications; (2003) https://doi.org/10.1117/12.453318
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Dendrimers have unique highly branched repeating structures that display intriguing processing and photonic properties. We have recently synthesized several generations of a new dendrimer series based on bis-(diphenylamino)-E-stilbene repeat units which have proven to be highly processible in common organic solvents, and which can be designed and synthesized in either three-arm or four-arm structural motifs. We have measured the dependence of the two-photon absorption (TPA) on excitation wavelength for the G-0, G-1 and G-2 generations of these monodisperse macromolecules, and have shown that the maximum value for the intrinsic TPA cross-section for femtosecond pulses inceases in proportion to the total number of stilbene chromophores, and yields a record high cross-sectrion for the G-2 dendrimer (11,000 GM units). We have now been able to incorporate a variety of electron donor and acceptor substituents in the three-arm dendrimer G-0 system to establish structure-property relatiuonships for the further enhancement of the intrinsic two-photon cross-sections. We have found a dramatic enhancement of the two-photon cross-sections for these dendrimers compared to the parent bis-(diphenylamino)-E-stilbene (BDPAS). In the 3-arm G-0 series, the intrinsic TPA cross-section, measured at the TPA maximum, varies from 1,400 to 1,900 GM units compared to 130 GM units for BDPAS, a more than 10-fold enhancement, while the number of BDPAS repeat units in the G-0 dendrimer is only 3 times the parent BDPAS structure.

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Charles W. Spangler, Zhiyong Suo, Mikhail A. Drobizhev, Aliaksandr Karotki, and Aleksander Rebane "Design, synthesis, and characterization of new organic dendrimers with greatly enhanced two-photon absorption", Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); https://doi.org/10.1117/12.453318

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