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We propose the experimental scheme and present detailed theory of the opticalchopper which functionality is based on the balance between the Casimir andlight pressures. The proposed device consists of two atomically thin metallicmirrors forming the Fabry-P\'{e}rot microfilter. One of the mirrors isdeposited on a solid cube and another one on a thinner wall subjected tobending under the influence of the attractive Casimir force and repulsive forcedue to the pressure of light from a continuous laser amplified in the resonatorof a microfilter. The separation distance between the mirrors should onlyslightly exceed the half wavelength of the laser light. It is shown that inthis case the resonance condition in the microfilter alternatively obeys andbreaks down resulting in the periodic pulses of the transmitted light. TheCasimir pressure is calculated taking into account an anisotropy of thedielectric permittivity of a metal at several first Matsubara frequencies. Thereflectivity properties of atomically thin metallic mirrors in the opticalspectral range are found using the experimentally consistent phenomenologicalapproach developed earlier in the literature. The specific values of allparameters, found for the microfilter made of quartz glass with Ag mirrors,demonstrate its workability. The proposed optical chopper may find prospectiveapplications in the emerging field of nanotechnology exploiting the effects ofquantum fluctuations.

Optical chopper driven by the Casimir force