Thiophene-fluorene derivatives with high three-photon absorption activities and their application to optical power limiting |
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| Authors: | Ma Wen-Bo Wu Yi-Qun Han Jun-He Liu Jun-Hui Gu Dong-Hong and Gan Fu-Xi |
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| Affiliation: | Department of Optical Storage, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Laboratory of Functional Materials, Heilongjiang University, Haerbin 150080, China; Department of Physics, Henan University, Kaifeng 475001, China |
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| Abstract: | The three-photon absorption (3PA) properties of two thiophene-fluorene
derivatives (abbreviated as MOTFTBr and {ATFTBr}) have been determined by using a
Q-switched Nd:YAG laser pumped with 38ps pulses at 1064nm in DMF. The
measured 3PA cross-sections are 152\times 10-78cm6s2 and
139\times 10-78cm6s2, respectively. The optimized
structures were obtained by AM1 calculations and the results indicate that
these two molecules show nonplanar structures, and attaching different
donors has different effects on the molecular structure. The charge density
distributions during the excitation were also systematically studied by
using AM1 method. In addition, an obvious optical power limiting effect
induced by 3PA has been demonstrated for both derivatives. |
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| Keywords: | three-photon absorption thiophene-fluorene derivative AM1 optical power limiting |
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