Details

Autor(en) / Beteiligte

• Zhang, X.-C
• Liu, Jingle
• Dai, Jianming
• Chin, See Leang

Titel

Broadband terahertz wave remote sensing using coherent manipulation of fluorescence from asymmetrically ionized gases

Ist Teil von

• Nature photonics, 2010-09, Vol.4 (9), p.627-631

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Terahertz wave sensing and imaging have received a great deal of attention because of their significant scientific and technological potential in multidisciplinary fields. However, owing to the challenge of dealing with high ambient moisture absorption, the development of remote open-air broadband terahertz spectroscopy is lagging behind the urgent need for the technology that exists in homeland security and the fields of astronomy and environmental monitoring. The requirement for on-site bias or forward collection of the optical signal in conventional terahertz detection techniques has inevitably prohibited their use in remote sensing. We introduce an 'all-optical' technique of broadband terahertz wave detection by coherently manipulating the fluorescence emission from asymmetrically ionized gas plasma interacting with terahertz waves. Owing to the high atmospheric transparency and omnidirectional emission pattern of the fluorescence, this technique can be used to measure terahertz pulses at standoff distances with minimal water vapour absorption and unlimited directionality for optical signal collection. We demonstrate coherent terahertz wave detection at a distance of 10 m.