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  Continuous wave Terahertz emitter arrays for spectroscopy and imaging applications

Bauerschmidt, S., Preu, S., Malzer, S., Doehler, G. H., Wang, L. J., Lu, H., et al. (2010). Continuous wave Terahertz emitter arrays for spectroscopy and imaging applications. In TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS IV: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA: SPIE-INT SOC OPTICAL ENGINEERING. doi:10.1117/12.850090.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-6B7F-4 Versions-Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-6B80-F
Genre: Konferenzbeitrag

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 Urheber:
Bauerschmidt, S.1, Autor           
Preu, S.1, 2, Autor           
Malzer, S.3, Autor           
Doehler, G. H.4, Autor           
Wang, L. J.1, Autor           
Lu, H.5, Autor
Gossard, A. C.5, Autor
Affiliations:
1Max Planck Fellow Group, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364711              
2International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364697              
3Guests, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364696              
4External Organizations, ou_persistent22              
5external, ou_persistent22              

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Schlagwörter: OSCILLATOR; LASERSOptics; Physics; Imaging Science & Photographic Technology; THz; phased array; spectroscopy; imaging; continuous wave;
 Zusammenfassung: We report on arrays of THz-emitters based on n-i-pn-i-p-superlattice photomixers for imaging and spectroscopic applications. The output power of a n-i-pn-i-p superlattice photomixers recently has reached nearly 1 mu W at 1 THz with a broadband antenna. There are no fundamental physical limitations at this stage for further improvement. Tunable continuous wave (CW) THz-sources for imaging and spectroscopy are highly desired tools for security and environmental applications. In particular, most stand-off imaging applications require a rather high THz power to allow for a sufficient dynamic range, and a narrow illumination spot size for high spatial resolution. Both goals can be reached by using an array of mutually coherent photomixers. We have simulated beam patterns for an arbitrary number of mutually coherent single sources with respect to a small beam size and high peak intensity. Here, we confirm the simulations experimentally by an array of 4 sources with a 4 inch THz optics. The beam profile is measured in the target plane at a stand-off distance of 4.2 m. As a result, the beam diameter is reduced by a factor of 6 and the peak intensity is enhanced by a factor of close to (4)(2) = 16, in excellent agreement with our simulations. Such an arrangement allows not only for high resolution stand-off imaging but also for spectroscopic investigations at stand-off distances. The THz frequency can be tuned over more than a decade (i.e. 0.1 to 2.5 THz) by tuning the wavelength of the mixing lasers. The spectral linewidth of the THz sources is only limited by the linewidths of the mixing lasers and can be made extremely narrow. A straightforward demonstration is achieved by water vapor spectroscopy in laboratory air with a single source.

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Sprache(n): eng - English
 Datum: 2010
 Publikationsstatus: Online veröffentlicht
 Seiten: 11
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000284871000008
DOI: 10.1117/12.850090
 Art des Abschluß: -

Veranstaltung

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Titel: Conference on Terahertz Physics, Devices, and Systems IV - Advanced Applications in Industry and Defence
Veranstaltungsort: Orlando, FL
Start-/Enddatum: 2010-04-05 - 2010-04-06

Entscheidung

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Projektinformation

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Quelle 1

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Titel: TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS IV: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE
  Alternativer Titel : PROC SPIE
Genre der Quelle: Konferenzband
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA : SPIE-INT SOC OPTICAL ENGINEERING
Seiten: SPIE Band / Heft: - Artikelnummer: 76710D Start- / Endseite: - Identifikator: ISSN: 0277-786X
ISBN: 978-0-8194-8135-1

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Titel: Proceedings of SPIE
  Alternativer Titel : PROC SPIE
Genre der Quelle: Reihe
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 7671 Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 0277-786X