English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
 Local TagsRelease HistoryDetailsSummary
  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.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-6B7F-4 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-6B80-F
Genre: Conference Paper

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Bauerschmidt, S.1, Author           
Preu, S.1, 2, Author           
Malzer, S.3, Author           
Doehler, G. H.4, Author           
Wang, L. J.1, Author           
Lu, H.5, Author
Gossard, A. C.5, Author
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              

Content

show
hide
Free keywords: OSCILLATOR; LASERSOptics; Physics; Imaging Science & Photographic Technology; THz; phased array; spectroscopy; imaging; continuous wave;
 Abstract: 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.

Details

show
hide
Language(s): eng - English
 Dates: 2010
 Publication Status: Published online
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000284871000008
DOI: 10.1117/12.850090
 Degree: -

Event

show
hide
Title: Conference on Terahertz Physics, Devices, and Systems IV - Advanced Applications in Industry and Defence
Place of Event: Orlando, FL
Start-/End Date: 2010-04-05 - 2010-04-06

Legal Case

show

Project information

show

Source 1

show
hide
Title: TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS IV: ADVANCED APPLICATIONS IN INDUSTRY AND DEFENSE
  Alternative Title : PROC SPIE
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA : SPIE-INT SOC OPTICAL ENGINEERING
Pages: SPIE Volume / Issue: - Sequence Number: 76710D Start / End Page: - Identifier: ISSN: 0277-786X
ISBN: 978-0-8194-8135-1

Source 2

show
hide
Title: Proceedings of SPIE
  Alternative Title : PROC SPIE
Source Genre: Series
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 7671 Sequence Number: - Start / End Page: - Identifier: ISSN: 0277-786X