Time and frequency response characteristics of bacteriorhodopsin-based photodetectors

Wei Wei Wang; George K. Knopf; Amarjeet S. Bassi

doi:10.1117/1.2335888

1 August 2006 Time and frequency response characteristics of bacteriorhodopsin-based photodetectors

Wei Wei Wang, George K. Knopf, Amarjeet S. Bassi

Author Affiliations +

Optical Engineering, Vol. 45, Issue 8, 084001 (August 2006). https://doi.org/10.1117/1.2335888

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.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Wei Wei Wang, George K. Knopf, and Amarjeet S. Bassi "Time and frequency response characteristics of bacteriorhodopsin-based photodetectors," Optical Engineering 45(8), 084001 (1 August 2006). https://doi.org/10.1117/1.2335888

Published: 1 August 2006

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