I agree with Michael and want to say more. The boundary of plasma is not clear.
The reliable of discharging is not good. It will be a device with RF parts. It
will have more power consumption compared to a mirror.
BR
BOB101

 D Martin  wrote:
Neat idea! Here's a couple of problems that occur to me immediately. The
first is uniformity. On the microscale the plasma in a plasma display
panel is not very homogeneous. So within a given pixel there is a large
variation in electron density. Second, I suspect that in order to reach
the electron densities required to make the plasma reflective in the
near IR (for telecom) you would have to have a plasma with an electron
density comparable to that of an arc discharge. Of course such a
thermalized plasma would emit all over the IR and would swamp out any
signal. That is just a guess, I'm no plasma physicist.

-Mike Martin
U. of Louisville