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Integrated optical switching based on the protein bacteriorhodopsin.

András Dér1, Sándor Valkai, László Fábián

  • 1Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary.

Photochemistry and Photobiology
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Native bacteriorhodopsin (bR) films offer superior nonlinear optical properties for integrated optics. This study demonstrates a real optical switching effect with over 90% efficiency using a Mach-Zehnder interferometer.

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Area of Science:

  • Optics and Photonics
  • Biophysics
  • Materials Science

Background:

  • Native bacteriorhodopsin (bR) films exhibit unique nonlinear optical properties.
  • These properties, including a large light-induced refractive index change (> 2 x 10^-3), surpass those of current integrated optics materials.
  • Previous studies established bR's potential for optical applications.

Purpose of the Study:

  • To demonstrate the first integrated optical application of bacteriorhodopsin.
  • To showcase a real optical switching effect using a miniature Mach-Zehnder interferometer.
  • To evaluate the switching efficiency and potential of different bR states.

Main Methods:

  • Fabrication of a dry film containing native bacteriorhodopsin.
  • Integration of the bR film into a miniature Mach-Zehnder interferometer.
  • Characterization of optical switching using light of different colors, focusing on the M-state and K-state.

Main Results:

  • A real optical switching effect with an efficiency greater than 90% was achieved using the M-state of bR.
  • The K-state of bR demonstrated a significant refractive index change (9 x 10^-4).
  • The results confirm the feasibility of bR for fast optical switching applications.

Conclusions:

  • Native bacteriorhodopsin is a promising material for integrated optical devices.
  • The demonstrated Mach-Zehnder interferometer shows high switching efficiency, validating bR's potential.
  • Further research into bR states could lead to advanced optical switching technologies.