Near IR Nonlinear Absorbing Chromophores with Optical Limiting Properties at Telecommunication Wavelengths

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• 作者：Pierre-Antoine Bouit ; Guillaume Wetzel ; Gé ; rard Berginc ; Brigitte Loiseaux ; Loï ; c Toupet ; Patrick Feneyrou ; Yann Bretonni&egrave ; re ; Kenji Kamada ; Olivier Maury ; Chantal Andraud
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：October 30, 2007
• 年：2007
• 卷：19
• 期：22
• 页码：5325 - 5335
• 全文大小：540K
• 年卷期：v.19,no.22(October 30, 2007)
• ISSN：1520-5002

文摘

Dipolar and symmetrical heptamethine dyes featuring strong linear absorption in the near-infraredspectral range (700-900 nm) were prepared at a gram scale. X-ray crystallographic structure of thedipolar chromophore is described revealing the remarkable planarity of the polyenic chain due to thecentral ring of the molecule. These chromophores present promising nonlinear absorption properties attelecommunication wavelengths (1400-1600 nm): (i) significant two-photon cross-sections were measuredusing the femtosecond Z-scan method, and (ii) their exceptional solubility allows us to carry out anoptical-limiting experiment at 1500 nm in the nanosecond regime. In this regime, experimental datawere interpreted on the basis of two-photon absorption (2PA) and 2PA-induced excited-state absorption(ESA). Finally, these systems, which present a lot of relevant properties (significant nonlinear absorptionproperties, two-step gram scale synthesis, high solubility, good thermal stability, and several sites offunctionalization), open the way to numerous practical applications in biology, solid-state optical limiting,and signal processing.