All-optical logic gates using bacteriorhodopsin films

We demonstrate all-optical logic gates using bacteriorhodopsin (bR) film. B y studying the transmission of bR film, we advance an all-light-modulated t ransmission mechanism of bR film: complementary suppression-modulated trans mission (CSMT). When a yellow beam (568 nm) and a blue beam (412 nm) illumi nate bR film, the two transmitted beams suppress mutually. Based on this me chanism, we design an all-optical operating device in which we implement al l 16 kinds of double-variable binary logic operations. The intensity of an incident yellow or blue beam acts as the input to the logic gate and the tr ansmission bears the output of the gate. We can turn this all-optical devic e into different states using different wavelengths and different intensity illuminations. (C) 2000 Society of Photo-Optical Instrumentation Engineers . [S0091-3286(00)01202-2].