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  • 1995-1999  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Dispersion of the nonlinear absorption of copper phthalocyanine in a silica xerogel matrix through the visible spectrum (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3441-3443 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Recently, macrocyclic organic dyes have attracted a lot of attention as possible candidates for applications in optical power limiters and pulse shaping devices. We present results for the effective excited state absorption cross section of copper phthalocyanine tetrasulfonate (CuPcTs) in a CuPcTs/Silica xerogel composite. The sample was prepared by the sol-gel method using ultrasound energy to promote the hydrolysis of tetramethoxysilane which was the silica precursor. The study has been performed in the visible region of the spectrum from 450 to 730 nm. This study represents a complete description of the dispersion of the nonlinear absorption for the composite. Measurements were also obtained for a solution of the CuPc in sulfuric acid for comparison purposes. We observed reverse saturable absorption in the range of 450–540 nm wavelength and saturable absorption in the range 570–730 nm wavelength for the composite. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.367115
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  • 2
    Digitale Medien
    Digitale Medien
    All-optical light modulation in bacteriorhodopsin films (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 599-601 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report a convenient method to obtain all-optical light modulation in bacteriorhodopsin films using a degenerate four-wave mixing geometry. Chemically stabilized films of bacteriorhodopsin in a polymer matrix for which the lifetime of the excited M state is tens of seconds were used to demonstrate all-optical light intensity modulation. The films are observed to be stable over a period of 4 years. Due to the sensitivity of the films, small intensities of order microwatt/ cm2 are required in the modulation experiments. Furthermore the fast photochemical transition from M to B permit reasonably fast modulation speeds independent of the slow thermal M and B relaxation time. The experimental system also acts as an all-optical switch where a low power blue pulse turns on a signal red beam. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115401
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  • 3
    Digitale Medien
    Digitale Medien
    Optical implementation of the wavelet transform by using a bacteriorhodopsin film as an optically addressed spatial light modulator (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1484-1486 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An optical system utilizing the photoinduced dichroism in a bacteriorhodopsin film has been demonstrated for the optical implementation of wavelet transforms. The dichroism, induced by the image of a wavelet filter on a bacteriorhodopsin film leads to polarization rotation of the Fourier components of an image. The polarization-rotated Fourier components of an input scene are analyzed with a polarizer to give the wavelet transform components. The dichroism is induced with beams whose profiles are determined by wavelet filters in order to perform the optical wavelet transform. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122180
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