Terahertz hyperspectral imaging with dual chip-scale combs
Abstract
Hyperspectral imaging is a technique that allows for the creation of multi-color images. At terahertz wavelengths, it has emerged as a prominent tool for a number of applications, ranging from non-ionizing cancer diagnosis and pharmaceutical characterization to non-destructive artifact testing. Contemporary terahertz imaging systems typically rely on non-linear optical down-conversion of a fiber-based near-infrared femtosecond laser, requiring complex optical systems. Here, we demonstrate hyperspectral imaging with chip-scale frequency combs based on terahertz quantum cascade lasers. The dual combs are free-running and emit coherent terahertz radiation that covers a bandwidth of 220 GHz at 3.4 THz with ~10 {\mu}W per line. The combination of the fast acquisition rate of dual-comb spectroscopy with the monolithic design, scalability, and chip-scale size of the combs is highly appealing for future imaging applications in biomedicine and in the pharmaceutical industry.
Cite
@article{arxiv.1812.03505,
title = {Terahertz hyperspectral imaging with dual chip-scale combs},
author = {Lukasz A. Sterczewski and Jonas Westberg and Yang Yang and David Burghoff and John Reno and Qing Hu and Gerard Wysocki},
journal= {arXiv preprint arXiv:1812.03505},
year = {2018}
}