Modelling of light modulation processes in D85N bacteriorhodopsin

A simplified model for the complex photocycle of the D85N genetic variant o f the bacteriorhodopsin (bR) protein molecule is presented. Steady state po pulation densities of the various intermediate states of the molecule induc ed by photo-absorption of modulation light beam are obtained using the rate equations approach. All-optical modulation of various probe signals at wav elengths corresponding to absorption peaks of each of the intermediate stat es by a pump signal at 570 nm is presented in the form of optical densities . The analysis presented here is useful for designing the molecular spatial light modulators using D85N variant of bR molecules.