8 February 2007 Resonance enhancement of two-photon absorption of phthalocyanines for 3D optical storage in the presence of hot-band absorption
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Abstract
We study a new series of asymmetrical phthalocyanines with promising properties for two-photon 3D optical memory. The chromophores have a strong and narrow one-photon absorption (1PA) S0 -> S1 band at 730-760 nm, with a 200-400 cm-1 width. Tuning the laser frequency 500-1000 cm-1 below the S0 -> S1 band allows for very high values of two-photon absorption (2PA) cross-section &sgr;2 > 104 GM. At temperatures T < 110K the molecules can be switched between two tautomer forms by 2PA. We measure 2PA spectra as a function of frequency and sample temperature. We provide an analysis of changes in 2PA spectra and cross sections due to different substituent groups. As a result, we found that among the set of studied molecules, there is one which is the most promising for rewritable 3D optical memory.
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Nikolay Makarov, Nikolay Makarov, Mikhail Drobizhev, Mikhail Drobizhev, Aleksander Rebane, Aleksander Rebane, Desiree Peone, Desiree Peone, Heinz Wolleb, Heinz Wolleb, Heinz Spahni, Heinz Spahni, Elena A. Makarova, Elena A. Makarova, Evgeny A. Lukyanets, Evgeny A. Lukyanets, } "Resonance enhancement of two-photon absorption of phthalocyanines for 3D optical storage in the presence of hot-band absorption", Proc. SPIE 6470, Organic Photonic Materials and Devices IX, 64700R (8 February 2007); doi: 10.1117/12.696970; https://doi.org/10.1117/12.696970
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