Materials for 3D optical storage: - PowerPoint PPT Presentation

1 / 10
About This Presentation
Title:

Materials for 3D optical storage:

Description:

... On the one hand, one would like to tune laser frequency as close as possible ... other hand, one would like to tune as far as possible to decrease ... – PowerPoint PPT presentation

Number of Views:199
Avg rating:3.0/5.0
Slides: 11
Provided by: msu142
Category:

less

Transcript and Presenter's Notes

Title: Materials for 3D optical storage:


1
Materials 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)
2
Outline
  • Principles of 3D 2PA optical memory
  • Lack of 2PA-sensitive photochromes
  • 2PA resonance enhancement
  • 2PA vs. 1PA
  • 2PA-sensitive phtalocyanines
  • Summary
  • References

3
Principles of 3D 2PA optical memory
4
Lack 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!
5
2PA 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.
6
2PA vs. 1PA
850-900 nm
7
2PA-sensitive phtalocyanines
8
Summary
  • 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

9
References
  • D.A. Parthenopoulos, P.M. Rentzepis,
    Three-Dimensional Optical Storage Memory,
    Science, 245, 843-845 (1989).
  • M. Drobizhev, A. Karotki, M. Kruk, A. Rebane,
    Resonance enhancement of two-photon absorption
    in porphyrins, Chem. Phys. Lett., 355, 175-182,
    (2002).
  • M. Drobizhev, Y. Stepanenko, Y. Dzenis, A.
    Karotki, A. Rebane, P.N. Taylor, H.L. Anderson,
    Understanding Strong Two-Photon Absorption in
    -Conjugated Porphyrin Dimers via Double-Resonance
    Enhancement in a Three-Level Model, J. Am. Chem.
    Soc., 126, 15352-15353 (2004).
  • M. Drobizhev, F. Meng, A. Rebane, Y. Stepanenko,
    E. Nickel, C.W. Spangler, Strong two-photon
    absorption in new asymmetrically substituted
    porphyrins interference between charge-transfer
    and intermediate-resonance pathways, J. Phys.
    Chem. B, 110, 9802-9814 (2006).
  • M. Drobizhev, Y. Stepanenko, Y. Dzenis, A.
    Karotki, A. Rebane, P.N. Taylor, H.L. Anderson,
    Extremely strong near-IR two-photon absorption
    in conjugated porphyrin dimmers quantitative
    description with three-essential-states model,
    J. Phys. Chem. B, 109, 7223-7236 (2005).
  • M. Drobizhev, A. Karotki, M. Kruk, N. Zh.
    Mamardashvili, A. Rebane, Drastic enhancement of
    two-photon absorption in porphyrins associated
    with symmetrical electron-accepting
    substitution, Chem. Phys. Lett., 361, 504-512
    (2002).
  • I. Renge, H. Wolleb, H. Spahni, U.P. Wild,
    Phthalonaphthalocyanines New Far-Red Dyes for
    Spectral Hole Burning, J. Phys. Chem. A 101,
    6202-6213, (1997).
  • A.A. Gorokhovskii, R.K. Kaarli, L.A. Rebane,
    Hole Burning in Contour of a Pure Electronic
    Line in a Shpolskii System, JETP Lett., 20,
    216-218, (1974).
  • M. Drobizhev, A. Karotki, A. Rebane, Persistent
    Spectral Hole Burning by Simultaneous Two-Photon
    Absorption, Chem. Phys. Lett., 334, 76-82,
    (2001).
  • A. Rebane, M. Drobizhev, A. Karotki, Y. Dzenis,
    C.W. Spangler, A. Gong, F. Meng, New two-photon
    materials for fast volumetric rewritable optical
    storage, in Proc. SPIE, Advanced Optical and
    Quantum Memories and Computing, Eds. H.J. Coufal,
    Z.U. Hasan, (SPIE, Belligham, WA, 2004), 5362,
    pp. 10-19.
  • M. Drobizhev, A. Karotki, M. Kruk, A.
    Krivokapic, H.L. Anderson, A. Rebane, Photon
    energy upconversion in porphyrins one-photon
    hot-band absorption versus two-photon
    absorption, Chem. Phys. Lett., 370, 690-699
    (2003).
  • A. Karotki, M. Drobizhev, Y. Dzenis, P.N.
    Taylor, H.L. Anderson, A. Rebane, Dramatic
    enhancement of intrinsic two-photon absorption in
    a conjugated porphyrin dimer, Phys. Chem. Chem.
    Phys., 6, 7-10 (2004).
  • M. Drobizhev, A. Karotkii, A. Rebane, Dendrimer
    molecules with record large two-photon absorption
    cross section, Opt. Lett., 26, 1081-1083 (2001).
  • M. Drobizhev, N.S. Makarov, A. Rebane, E.A.
    Makarova, E.A. Lukyanets, Two-photon absorption
    in tetraazachlorin and its benzo-and
    2,3-naphtho-fused derivatives Effective symmetry
    of ?-conjugation pathway, J. Porphyrines and
    Phtalocyanines, Proc. Of the International
    Conference on Porphyrines and Phtalocyanines,
    ICPP-4, Rome, Italy, 2-7 July, 2006 (to be
    published).

10
M.E. Marhic, Storage limit of two-photon-based
three-dimensional memories with parallel access,
Opt. Lett., 16, 1272-1273 (1991).
For systems that use parallel access by
simultaneous writing or reading of bits located
in an entire common plane, diffraction sets a
limit to the storage density that is far smaller
than that for sequential operation. Comparable
densities can be achieved by using a
three-dimensional waveguiding structure.
Write a Comment
User Comments (0)
About PowerShow.com