Title

Broadband optical limiter based on nonlinear photoinduced anisotropy in bacteriorhodopsin film

Authors

Authors

Y. H. Huang; G. Siganakis; M. G. Moharam;S. T. Wu

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

BIREFRINGENCE; Physics, Applied

Abstract

Nonlinear photoinduced anisotropy in a bacteriorhodopsin film was theoretically and experimentally investigated and a broadband active optical limiter was demonstrated in the visible spectral range. A diode-pumped second harmonic yttrium aluminum garnet laser was used as a pumping beam and three different wavelengths at lambda=442, 532, and 655 nm from different lasers were used as probing beams. The pump and probe beams overlap at the sample. When the pumping beam is absent, the probing beam cannot transmit the crossed polarizers. With the presence of the pumping beam, a portion of the probing light is detected owing to the photoinduced anisotropy. Due to the optical nonlinearity, the transmitted probing beam intensity is clamped at a certain value, which depends on the wavelength, when the pumping beam intensity exceeds 5 mW/mm(2). Good agreement between theory and experiment is found. (C) 2004 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

85

Issue/Number

22

Publication Date

1-1-2004

Document Type

Article

Language

English

First Page

5445

Last Page

5447

WOS Identifier

WOS:000225483700106

ISSN

0003-6951

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