I was wondering if it were possible to have some chemical that would change it's state for some duration when hit by a beam of some frequency of light, such that it would change from transparent to reflective/refractive to another beam of light along the same axis of a different frequency, in a way to change the 2nd beam's trajectory? Does something like this already exist? If not, has it been theorised?
^ // Altered trajectory // >>beam2>> >>beam1>> **chemical compound**
The idea is to have a uniform substrate of this compound, where you fire beam1 to saturate a line in it. Once saturated, beam1 would shut off and the line would start to revert, but in section order in which they were transformed.
t0 >>beam1>> [section 0][section 2]...[section n] tn >>beam1>> [SECTION 0][SECTION 2]...[SECTION n]
Beam2 would pulse, emitting light along the length of the line, but only at sections that haven't been reverted.
// tn+0 >>beam2>> [SECTION 0][SECTION 2]...[SECTION n] tn+2 [section 0][SECTION 2]...[SECTION n] // tn+n >>beam2>> [section 0][section 2]...[SECTION n]
If possible, it would enable cheaper displays, since processing wouldn't need complex etching, just highly timed laser diodes.