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Wavelength Dependence of the Photorefractive and Photodiffractive Properties of Holographic Thin Films Based on Bacteriorhodopsin

Published online by Cambridge University Press:  15 February 2011

Robert R. Birge ,
K. Can Izgi ,
Jeffrey A. Stuart  and
Jack R. Tallent
Robert R. Birge
Affiliation:
Department of Chemistry and Center for Molecular Electronics, Syracuse University, Syracuse, New York 13244–4100
K. Can Izgi
Affiliation:
Department of Chemistry and Center for Molecular Electronics, Syracuse University, Syracuse, New York 13244–4100
Jeffrey A. Stuart
Affiliation:
Department of Chemistry and Center for Molecular Electronics, Syracuse University, Syracuse, New York 13244–4100
Jack R. Tallent
Affiliation:
Department of Chemistry and Center for Molecular Electronics, Syracuse University, Syracuse, New York 13244–4100
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Abstract

The photorefractive and photodiffractive properties of a 2 × 10−3 M, 30μim thin film of bacteriorhodopsin at - 40°C are analyzed by using optical absorption spectroscopy, the Kramers- Kronig transformation and coupled wave theory. Conversion of M to bR generates a dispersion in the refractive index that has a broad negative band from 450 to 540 nm [Δn500nm - -0.0016] and a broad positive band from 590 to 700 nm [Δn605nm - 0.0016]. The large change in refractive index for moderate solute concentration is due to the formation of the protonated Schiff base chromophore in bR which generates a large red shift in the absorption spectrum as well as a large increase in oscillator strength. The integrated diffraction efficiency from 300 - 800nm is dominated by refractive index contributions (ηphase) which are maximum in regions of minimal bR and M absorption. The maximum in the refractive (phase) component occurs at 451 nm (ηphase - 9.7%) whereas the maximum in the absorption component occurs at 575 nm (ηabs - 2.2%). The maximum efficiency of diffraction is observed at ∼440 nm (ηtotal - 10.7%). Adequate diffractive performance for most applications is predicted for write wavelengths in the regions 380 - 420 & 500 - 650 nm and for read wavelengths from 380 to 740 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 218: Symposium V – Materials Synthesis Based on Biological Processes , 1990 , 131
Copyright
Copyright © Materials Research Society 1991

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References

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