Title: Materials for 3D optical storage:
1Materials for 3D optical storage two-photon
access vs. one-photon background
N.S. Makarov, A. Rebane, M. Drobizhev (Department
of Physics, Montana State University, Bozeman, MT
59717, USA) H. Wolleb, H. Spahni (Ciba Specialty
Chemicals Inc, P.O. Box Ch-4002 Basle,
Switzerland)
2Outline
- Principles of 3D 2PA optical memory
- Lack of 2PA-sensitive photochromes
- 2PA resonance enhancement
- 2PA vs. 1PA
- 2PA-sensitive phtalocyanines
- Summary
- References
3Principles of 3D 2PA optical memory
4Lack of 2PA-sensitive photochromes
Access with 1 pulse 100fs, 100MHz gt 1TB
read/write in 22.2 hrs Each bit have to be
written and read by only 1 femtosecond pulse!
52PA resonance enhancement
A fundamental trade-off between 2PA and 1PA may
be formulated as follows On the one hand, one
would like to tune laser frequency as close as
possible to the resonance in order to increase
useful signal, but on the other hand, one would
like to tune as far as possible to decrease
detrimental background.
62PA vs. 1PA
850-900 nm
72PA-sensitive phtalocyanines
8Summary
- Because of the requirement of fast speed writing
and readout, the storage materials need to have
high molecular 2PA cross section, ?2gt103-104 GM - It is evident that the crucial points in this
approach are the two-photon sensitivity of a
molecule and the possibility of its photochemical
transformation from one form to another - Careful choice of excitation frequency, along
with suitable combination of 1PA and 2PA
properties allow minimizing the negative impact
of underlying near resonance hot band absorption - Our model allows to predict the appropriateness
of chromophores for the 2PA-based optical storage
9References
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Resonance enhancement of two-photon absorption
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Karotki, A. Rebane, P.N. Taylor, H.L. Anderson,
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