Tunable dual-band atomic mirror based on subwavelength atomic arrays under electromagnetically induced transparency
Phys. Rev. A 113, 063705 – Published 3 June, 2026
DOI: https://doi.org/10.1103/8xsh-z1xq
Abstract
Subwavelength atomic arrays offer a powerful platform for engineering cooperative light-matter interactions and enabling quantum metasurfaces. We demonstrate that a two-dimensional array of three-level atoms operating under electromagnetically induced transparency can function as a tunable dual-band atomic mirror, where two independently controllable reflection bands emerge from the collective optical responses mediated by dipole-dipole interactions. These resonances yield dual reflection bands with asymmetric linewidths, whose spectral positions and bandwidths can be tuned through the control-field parameters, dipole orientation, incident geometry, and lattice constant. We further identify the conditions under which additional diffraction orders emerge, which delineate the operational and tunable range of the atomic mirror via its collective-mode structure. This scheme provides a fully tunable dual-band atomic mirror operating across broad frequency and angular ranges, potentially supporting the development of reconfigurable photonic elements in low-energy atomic-array platforms.
