Abstract
The thin film of a heptamethine cyanine chromophore HC was prepared by spin-coating technique. Its surface morphology and linear optical property were characterized by atomic force microscopy (AFM) and UV-visible absorption spectroscopy. The results show that HC molecules are arranged in a well-ordered H-aggregate type. The third-order nonlinear optical properties of the spin-coating film were also measured by degenerate four-wave mixing (DFWM) measurement. Enhanced third-order nonlinear susceptibility can be attributed to molecular aggregation effects, and the corresponding mechanism was dealt with by collective electronic oscillator (CEO) approach.
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Supported by the National Natural Science Foundation of China (Grant Nos. 10234030 and 10574046), National Key Project for Basic Research of China (No. 1999075204), Program for New Century Excellent Talents in University (NCET-04-0420), the Doctoral Program of High Education (20050269011), and Twilight Project sponsored by Shanghai Education Committee (No. 03SG23).
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Yuan, Y., Kang, H., Sun, Z. et al. Linear and third-order nonlinear optical properties for the heptamethine cyanine chromophore H-aggregates thin film. Chin. Sci. Bull. 52, 1897–1901 (2007). https://doi.org/10.1007/s11434-007-0262-5
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DOI: https://doi.org/10.1007/s11434-007-0262-5