Synthesis and nonlinear optical properties studies of extended squaraine chromophores

ORGN 613

Shijun Zheng, sz35@mail.gatech.edu1, Arianna Biesso1, Jie Fu, jfu@creol.ucf.edu2, Joel M Hales, Joel.Hales@chemistry.gatech.edu1, Sung-Jae Chung1, Tehetena Mesganaw1, Toru Odani, to34@mail.gatech.edu1, Stephen Barlow, stephen.barlow@chemistry.gatech.edu1, J. W. Perry, joe.perry@chemistry.gatech.edu1, Eric W. Van Stryland, ewvs@creol.ucf.edu3, David J. Hagan2, and Seth R. Marder1. (1) School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, 770 State Street, Atlanta, GA 30332-0400, (2) College of Optics and Photonics: CREOL and FPCE, University of Central Florida, (3) CREOL and FPCE, College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816
A series of extended squaraine chromophores with D-π-A-π-D and D'-π-D-π-D-A-D' motifs were synthesized and their structure and nonlinear optical properties were studied. They show extraordinarily large two-photon absorption cross sections (around 16,000 GM) in the near IR range, large second hyperpolarizabilities γ on the order of 10-32 esu, and large χ(3) values by degenerate-four-wave-mixing and Z-scan methods at 1.3 and 1.5 µm. More than 50% of |γ| was found to be imaginary, which is consistent with the significant two-photon absorption observed at these wavelengths. The positive Re(γ) values observed are, therefore, strongly resonantly enhanced.

 

Materials, Devices, and Switches
8:00 AM-12:00 PM, Thursday, 30 March 2006 Georgia World Congress Center -- Georgia Ballroom 2, Oral

Division of Organic Chemistry

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006