# 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.

## Key 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.

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Source: https://tomesphere.com/paper/1705.02428