Study on the Near-Field Optical Storage Property of Bacteriorhodopsin

With near-field optical microscope,the static photochromic property of BR-D96N film is investigated based on its transition between B State and M state.The results show that in the near-field area of BR film,it has strong absorbance to red light before excited by green light,but not after excited to M state,and BR can relax to B state when there is no exciting light.This near-field property of BR is similar to that of far-field,having special character of photochromism and relaxation,and BR is expected to be used as high-density optical storage media and micro-devices of optical information processing.