Accession Number:



Bacteriorhodopsin Sol-Gel for Holographic Applications.

Descriptive Note:

Final rept. 19 Aug 96-19 Feb 99

Corporate Author:


Personal Author(s):

Report Date:


Pagination or Media Count:



Many Bacteriorhodopsin BR mutants were synthesized and their optical absorption properties were measured. Several of the mutants were identified that formed the so-called Q390 state at neutral pH, but the ultra-long storage lifetime of this state was not investigated. The double mutant D85NV49A showed a factor of 50 increase in holographic recording sensitivity compared with the single mutant D85N, and had similar diffraction efficiency. The increased sensitivity of this mutant in the spectral range of laser diodes and its long storage lifetime makes this film a good choice for real-time holographic interferometry systems and optical data storage applications. It was demonstrated that a compact diode laser could be used to record and reconstruct holograms in thick films of the mutant D85N. It was demonstrated that lifetimes of several weeks could be achieved. Since diffusion limits the lifetime, using cross-linked BR can substantially increase it It was also demonstrated that very high data densities could be achieved using shift multiplexing with a speckle wave reference beam. With improved materials reduced scattering, crosslinked polymer host, a 3 mm thick CD-ROM sized disk of D85N could potentially be used to store hundreds of Gbytes of information.

Subject Categories:

  • Anatomy and Physiology
  • Electrooptical and Optoelectronic Devices
  • Optics

Distribution Statement: