English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Open-path dual-comb spectroscopy (DCS) significantly enhances ourunderstanding of regional trace gases. However, due to technical challenges,cost considerations, and eye-safety regulations, its sensing range andflexibility remain limited. The photon-counting DCS demonstrated recentlyheralds potential innovations over open-path DCS. Nevertheless, a majorchallenge in open-air applications of this approach lies in accuratelyextracting information from the arrival time of photons that have traversed theturbulent atmosphere. Here, we demonstrate a photon-level dual-combinterferometer for field deployment in open-air environments, uniquely designedto counteract the impact of optical path-length variations caused byatmospheric turbulence and fiber-length wandering. Under variable opticalpath-length conditions, 20nm broadband absorption spectrum of H13C14N isacquired, with the power per comb line detected as low as 4 attowatt .Furthermore, this photon-level DCS achieves comb-line resolution with aquantum-noise-limited signal-to-noise (SNR). This paves the way for novelopen-path DCS applications, including non-cooperative target sensing andsensing over a hundred-kilometers range, all within a portable, fieldable,eye-safety and low power consumption system.

A photon-level broadband dual-comb interferometer for turbulent open-air trace gases detection application