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Optical Engineering

Time and frequency response characteristics of bacteriorhodopsin-based photodetectors
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Paper Abstract

The time and frequency response behavior of a new class of photodetectors based on a light-sensitive protein, known as bacteriorhodopsin (bR), is described. Each bR-based detector consists of an indium tin oxide (ITO) electrode/bR thin film/indium tin oxide (ITO) electrode structure. The response of the photodetector to square-wave and transient pulse illumination are both simulated using an equivalent resistor-capacitor (RC) circuit and experimentally observed. The investigative study demonstrates that the physical dimensions of the sensor surface, load resistance and capacitance, and the illumination conditions all have an impact on the transient response and gain-bandwidth characteristics. It is observed that changing the sensing area of the detector only affects the amplitude of the response, but not the bandwidth. Increasing the load resistance produces a higher gain, but reduces bandwidth. Increasing the load capacitance has the effect of dramatically reducing both gain and bandwidth. The observations and conclusions derived from this research provide design guidelines for developing hybrid photoelectric sensors and imaging arrays using bacteriorhodopsin thin films.

Paper Details

Date Published: 1 August 2006
PDF: 9 pages
Opt. Eng. 45(8) 084001 doi: 10.1117/1.2335888
Published in: Optical Engineering Volume 45, Issue 8
Show Author Affiliations
Wei Wei Wang, The Univ. of Western Ontario (Canada)
George K. Knopf, The Univ. of Western Ontario (Canada)
Amarjeet S. Bassi, The Univ. of Western Ontario (Canada)

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