Writing is easily accomplished by exposing a photochromic
material to focused spots of light appropriate to induce the photochromic
reaction that changes the colour of the compounds at the storage site.
fluorescent proteins may be useful for optical data processing, optical and biological switches, holography, information processing, nonlinear optics, and in light sensors.
For example, photochromic
and thermochromic systems are passive, chemical-reaction, smartglass technologies that respond to light and temperature change respectively.
Of particular excitement during the 1997 selling season has been the introduction of the mass market priced Sensor-X sunglass line, a photochromic
(color-changing) optical glass lens using Corning sun sensor XDF lens technology.
Yet there will be sustainable innovations in building: photochromic
glass for example will soon perhaps be cheap enough to use on a large scale; electrochromic glass is very expensive now, but will presumably become cheaper.
The extra cost of photochromic
lenses can be worth the expense since they do away with the need for two pairs of specs.
Vermeulen and Thompson have also made a more photochromic
version of the material.
They propose embedding so-called photochromic
chemicals, which change color when briefly illuminated, inside transparent plastic cubes and using lasers to record data as tiny colored and uncolored dots in the cube, creating a binary code.
The PhD 2.0 NXT Sun lens features Serengeti 3-in-1 lens technology: polarisation, spectral control and photochromic
' Of course we recall that their spontaneous reaction to the loss then was the illogical claim of 'photochromic
' ballot paper that ensured that when APC was voted for, it will turn to a vote for PDP, such as the classical falsehood that governs the APC.
Acuvue Oasys achieves the darkening effect through a light-sensitive dynamic photochromic
filter developed by Transitions.