Scan-less hyperspectral dual-comb single-pixel-imaging in both amplitude and phase

TL;DR

This paper presents a novel scan-less hyperspectral imaging method combining dual-comb spectroscopy with single-pixel imaging, achieving high spectral and spatial resolution without mechanical scanning.

Contribution

It introduces a new hyperspectral imaging scheme that captures amplitude and phase images using dual-comb spectroscopy and Hadamard-transform-based single-pixel imaging.

Findings

Captured 12,000 hyperspectral images of amplitude and phase

Achieved 46 μm spatial resolution without mechanical scanning

Determined chromium layer thickness of 70 nm from phase images

Abstract

We have developed a hyperspectral imaging scheme that involves a combination of dual-comb spectroscopy and Hadamard-transform-based single-pixel imaging. The scheme enables us to obtain 12,000 hyperspectral images of amplitude and phase at a spatial resolution of 46 um without mechanical scanning. The spectral resolution is 20 MHz, as determined by the linewidth of a single comb mode, and the spectral interval is 100 MHz over a spectral range of 1.2 THz centred at 191.5 THz. As an initial demonstration of our scheme, we obtained spectroscopic images of a standard test chart through an etalon plate. The thickness of an absorptive chromium-coated layer on a float-glass substrate was determined to be 70 nm from the hyperspectral phase images in the near-infrared wavelength region.