Super-resolved imaging based on spatiotemporal wavefront shaping

TL;DR

This paper introduces a novel spatiotemporal wavefront shaping method using acoustic waves to enhance confocal imaging resolution beyond the diffraction limit by encoding spatial information in the temporal domain.

Contribution

It presents a new technique that leverages acoustic wave modulation and harmonic decomposition to achieve super-resolved imaging with improved robustness.

Findings

Resolution surpasses standard confocal imaging

Images beat the diffraction limit

Method demonstrates robustness in real conditions

Abstract

A novel approach to improving the performances of confocal scanning imaging is proposed. We experimentally demonstrate its feasibility using acoustic waves. It relies on a new way to encode spatial information using the temporal dimension. By moving an emitter, used to insonify an object, along a circular path, we create a temporally modulated wavefield. Due to the cylindrical symmetry of the problem and its temporal periodicity, the spatiotemporal input field can be decomposed into harmonics corresponding to different spatial vortices, or topological charges. Acquiring the back-reflected waves with receivers which are also rotating, multiple images of the same object with different Point Spread Functions (PSFs) are obtained. Not only is the resolution improved compared to a standard confocal configuration, but the accumulation of information also allows building images beating the diffraction limit. The topological robustness of the approach promises good performances in real life conditions.