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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 16 — Jun. 1, 2008
  • pp: 3023–3026

Continuous wave terahertz spectrometer as a noncontact thickness measuring device

Rafał Wilk, Falk Breitfeld, Martin Mikulics, and Martin Koch  »View Author Affiliations

Applied Optics, Vol. 47, Issue 16, pp. 3023-3026 (2008)

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We present a low cost terahertz (THz) spectrometer with coherent detection based on two simple and robust dipole antennas driven by two laser diodes. The spectrometer covers frequencies up to 1 THz , with a peak signal-to-noise ratio exceeding 40 dB for a lock-in integration time of 30 ms . We demonstrate that the thickness profile of a sample can be reconstructed from an acquired THz image.

© 2008 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(300.6495) Spectroscopy : Spectroscopy, teraherz
(110.6795) Imaging systems : Terahertz imaging

ToC Category:

Original Manuscript: February 20, 2008
Revised Manuscript: April 28, 2008
Manuscript Accepted: May 2, 2008
Published: May 26, 2008

Rafał Wilk, Falk Breitfeld, Martin Mikulics, and Martin Koch, "Continuous wave terahertz spectrometer as a noncontact thickness measuring device," Appl. Opt. 47, 3023-3026 (2008)

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  1. B. M. Fischer, M. Walther, and P. U. Jepsen, “Far-infrared vibrational modes of DNA components studied by terahertz time-domain spectroscopy,” Phys. Med. Biol. 47, 3807-3814(2002). [CrossRef] [PubMed]
  2. M. R. Kutteruf, C. M. Brown, L. K. Iwaki, M. B. Campbell, T. M. Korter, and E. J. Heilweil, “Terahertz spectroscopy of short-chain polypeptides,” Chem. Phys. Lett. 375, 337-343(2003). [CrossRef]
  3. K. Kawase, Y. Ogawa, and Y. Watanabe, “Non-destructive terahertz imaging of illicit drugs using spectral fingerprints,” Opt. Express 11, 2549-2554 (2003). [CrossRef] [PubMed]
  4. A. Hirata, M. Harada, and T. Nagatsuma, “120-GHz wireless link using photonic techniques for generation, modulation, and emission of millimeter-wave signals,” J. Lightwave Technol. 21, 2145-2153 (2003). [CrossRef]
  5. S. Wietzke, C. Jansen, F. Rutz, D. M. Mittleman, and M. Koch, “Determination of additive content in polymeric compounds with terahertz time-domain spectroscopy,” Polym. Test. 26, 614-618 (2007). [CrossRef]
  6. N. Karpowicz, H. Zhong, C. Zhang, K.-I Lin, J.-S. Hwang, J. Xu, and X.-C. Zhang, “Compact continuous-wave subterahertz system for inspection applications,” Appl. Phys. Lett. 86, 054105 (2005). [CrossRef]
  7. E. R. Brown, K. A. McIntosh, K. B. Nichols, and C. L. Dennis, “Photomixing up to 3.8 THz in low-temperature-grown GaAs,” Appl. Phys. Lett. 66, 285-287 (1995). [CrossRef]
  8. S. Matsuura, M. Tani, and K. Sakai, “Generation of coherent terahertz radiation by photomixing in dipole photoconductive antennas,” Appl. Phys. Lett. 70, 559-561 (1997). [CrossRef]
  9. S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett. 73, 3824-3826 (1998). [CrossRef]
  10. A. Nahata, J. T. Yardley, and T. F. Heinz, “Free-space electro-optic detection of continuous-wave terahertz radiation,” Appl. Phys. Lett. 75, 2524-2526 (1999). [CrossRef]
  11. P. Gu, M. Tani, M. Hyodo, K. Sakai, and T. Hidaka, “Generation of cw-terahertz radiation using a two-longitudinal-mode laser diode,” Jpn. J. Appl. Phys. 37, 976-978 (1998). [CrossRef]
  12. M. Hyodo, M. Tani, S. Matsuuro, N. Onodera, and K. Sakai, “Generation of millimetre-wave radiation using a dual-longitudinal-mode microchip laser,” Electron. Lett. 32, 1589-1591 (1996). [CrossRef]
  13. R. Wilk, A. Klehr, M. Mikulics, T. Hasek, M. Walther, and M. Koch, “Terahertz generation with a 1064 nm DFB laser diode,” Electron. Lett. 43, 108-110 (2007). [CrossRef]
  14. I. S. Gergory, W. R. Tribe, C. BakerB. E. Cole, M. J. Evans, L. Spencer, M. Pepper, and M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86, 204104 (2005). [CrossRef]
  15. K. J. Siebert, H. Quast, R. Leonhardt, T. Löffler, M. Thomson, T. Bauer, H. G. Roskos, and S. Czasch, “Continuous-wave all-optoelectronic terahertz imaging,” Appl. Phys. Lett. 80, 3003-3005 (2002). [CrossRef]
  16. M. R. Stone, M. Naftaly, R. E. Miles, I. C. Mayorga, A. Malcoci, and M. Mikulics, “Generation of continuous-wave terahertz radiation using a two-mode titanium sapphire laser containing an intracavity Fabry-Pérot etalon,” J. Appl. Phys. 97, 103108 (2005). [CrossRef]
  17. F. Rutz, M. Koch, S. Khare, M. Moneke, H. Richter, and U. Ewert, “Terahertz quality control of polymeric products,” Int. J. Infrared Millim. Waves 27, 547-556 (2006). [CrossRef]

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