Switchable optical filter with photonic crystals.

摘要

Limiter passive optical (1) photonic crystal for receiving a laser beam incident (2), which includes a non-linear and suitable to switch in a predetermined optical bandwidth, a transparent state to an opaque state depending on the potency of the material incident beam, wherein the nonlinear material is a nonlinear transition material insulating metal phase, comprising microstructures of the arranged material in a dielectric material (4) 3D transparent in said optical band to form layers of dielectric material microstructures (3) arranged in periodic lattices, alternating with layers of said dielectric material without microstructures, wherein the microstructures separated from each other by at least 100 nm and in that the dielectric material has a front face (41) intended to receive the incident beam and a rear face (42), the dimension of the microstructures is increasing and the distance (31) that separates decreci body when going from the front face to the rear face.