Patent ID: 8169680

Claim:
A radiation pressure activatable light filtering device, comprising: a container having a substantially optically clear portion through which light can pass; and a composition disposed in the container comprising a linear poly(N-substituted)(meth)acrylamide (co)polymer free of crosslinking and having a weight average molecular weight greater than 2.1×10 7 g/mol in a solution, wherein the composition is substantially optically clear below a lower critical solution temperature of the composition, wherein the (co)polymer is capable of undergoing a reversible phase transition that forms microdomains having a different refractive index in the solution in response to being exposed to light having a radiation pressure above a threshold value thereby causing the light above the threshold value incident on the phase transformed (co)polymer to scatter, and wherein the (co)polymer is soluble in the solution below the lower critical solution temperature and prior to exposure to said light above the threshold value.