Subwavelength focusing inside an open disordered medium by time reversal at a single point antenna

Abstract

We study theoretically light focusing at subwavelength scale inside a disordered strongly scattering open medium. We show that broadband time reversal at a single point antenna, in conjunction with near-field interactions and multiple scattering, produces spatial focusing with a quality comparable to that obtained in an ideal closed cavity. This gives new perspectives for super-resolved optical imaging and coherent control of single nanosources or absorbers in complex media.

References in corpus (3)

• Coherent Perfect Absorbers: Time-reversed Lasers
• Resonant Metalenses for Breaking the Diffraction Barrier
• Fluctuations of local density of states and C0 speckle correlations are equal

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• Multiple scattering model of the quantum random Lorentz gas
• Subwavelength imaging of sparse broadband sources surrounded by an open disordered medium from a single antenna
• Theory of the far-field imaging beyond the Rayleigh limit based on the super-resonant lens
• Far-field Imaging beyond the Diffraction Limit Using a Single Radar