Terahertz hyperspectral imaging with dual chip-scale combs
Hyperspectral imaging is a spectroscopic imaging technique that allows for the creation of images with pixels containing information from multiple spectral bands. At terahertz wavelengths, it has emerged as a prominent tool for a number of applications, ranging from nonionizing cancer diagnosis and pharmaceutical characterization to nondestructive artifact testing. Contemporary terahertz imaging systems typically rely on nonlinear optical downconversion of a fiber-based near-infrared femtosecond laser, requiring complex optical systems. In this work, we show 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 μW 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 the pharmaceutical industry.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Defense Advanced Research Projects Agency (DARPA)
- Grant/Contract Number:
- NA-0003525; AC04-94AL85000; W31P4Q-16-1-0001
- OSTI ID:
- 1523699
- Alternate ID(s):
- OSTI ID: 1529134
- Report Number(s):
- SAND-2019-0534J
- Journal Information:
- Optica, Journal Name: Optica Vol. 6 Journal Issue: 6; ISSN 2334-2536
- Publisher:
- Optical Society of AmericaCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
On-chip, self-detected terahertz dual-comb source
Frequency combs in optically injected terahertz ring quantum cascade lasers