Shaping Dynamical Casimir Photons

Temporal modulation of the quantum vacuum through fast motion a neutral body or changes its optical properties is known to promote virtual into real photons, so-called dynamical Casimir effect. Empowering protocols with spatial control could enable shaping spectral, spatial, spin, and entanglement emitted photon pairs. Space–time metasurfaces have been proposed as platform realize this physics via their properties. Here, we report mechanical analog phenomenon by considering systems in which lattice structure undergoes space time. We develop microscopic theory that applies both moving mirrors modulated surface profile atomic array meta-mirrors perturbed configuration. Spatiotemporal enables motion-induced generation co- cross-polarized pairs feature frequency-linear momentum well vortex featuring frequency-angular entanglement. The space–time effect can be interpreted induced asymmetry vacuum.