3-D Optical data storage based on reversible fluorescence control from a fluorescent dye to a photochromic diarylethene by two-photon excitation

ORGN 596

Claudia C. Corredor, ccorredo@mail.ucf.edu1, Kevin D. Belfield, belfield@mail.ucf.edu2, Ion Cohanoschi3, and Florencio E. Hernandez3. (1) Department of Chemistry, University of Central Florida, 4000 Central Florida Blvd., P.O. Box 162366, Orlando, FL 32816-2366, (2) Department of Chemistry and CREOL, College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., P.O. Box 162366, Orlando, FL 32816-2366, (3) Department of Chemistry and College of Optics and Photonics: CREOL and FPCE, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816
Photochromic properties of the diarylethene derivative (1) were investigated under one- and two-photon excitation. The quantum yields of cyclization and cycloreversion reactions of 1 were obtained in a broad spectral range. Two-photon absorption (2PA) cross-section of the open-form of 1 (88 GM at 260 nm) and of the closed form of 1 at 680 and 750 nm (153 GM and 148 GM, respectively) were determined. Evidence of two-photon induced cyclization reaction of 1 was shown under picosecond excitation. We also present the principles for a 3-D optical memory device based on two-photon excitation of 1, noncovalently linked to a two-photon fluorescence chromophore, 2, dispersed in a polymeric matrix. Writing of the memory is achieved by two-photon excitation of the open form of 1 at 520 nm. The closed form of diarylethene derivative 1 serves as a quencher of the fluorescence emission of fluorene derivative 2. Reading of the memory is achieved by two-photon excitation of 2 at 800 nm (corresponding to 400 nm wavelength of single photon excitation). Since the read (780 nm), write (520 nm), and erase (1040 nm) wavelengths are well-separated, this system potentially represents an economic alternative to covalent systems.

 

Heterocycles, Aromatics, Metal-Mediated Reactions and Syntheses, Materials, Devices, and Switches
8:00 PM-10:00 PM, Wednesday, 29 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster

Division of Organic Chemistry

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