Abstract

We present an imaging technique in which the broadband frequency information of terahertz (THz) pulses is transformed into spatial resolution. Efficient blazed diffractive gratings spread the individual frequency components over a wide and defined spatial range and f-theta optics are employed to focus the individual components onto a one-dimensional image-line. Measuring the time domain waveform of the THz waves allows therefore for a direct reconstruction of spatial sample characteristics as the spatial domain information is encoded in the terahertz spectrum. We will demonstrate terahertz imaging on selected samples with an improvement in acquisition speed up to two orders of magnitude.

©2012 Optical Society of America

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References

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  1. C. Jansen, S. Wietzke, O. Peters, M. Scheller, N. Vieweg, M. Salhi, N. Krumbholz, C. Jördens, T. Hochrein, and M. Koch, “Terahertz imaging: applications and perspectives,” Appl. Opt. 49(19), E48–E57 (2010).
    [Crossref] [PubMed]
  2. P. Jepsen, D. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – modern techniques and applications,” Laser Photon. Rev. 5(1), 124–166 (2011).
    [Crossref]
  3. D. H. Auston and K. P. Cheung, “Coherent time-domain far-infrared spectroscopy,” J. Opt. Soc. Am. B 2(4), 606–612 (1985).
    [Crossref]
  4. P. Jepsen, R. Jacobsen, and S. Keiding, “Generation and detection of terahertz pulses from biased semiconductor antennas,” J. Opt. Soc. Am. B 13(11), 2424–2436 (1996).
    [Crossref]
  5. M. Scheller, C. Jansen, and M. Koch, “Analyzing sub-100-μm samples with transmission terahertz time domain spectroscopy,” Opt. Commun. 282(7), 1304–1306 (2009).
    [Crossref]
  6. I. Duling and D. Zimdars, “Terahertz imaging: revealing hidden defects,” Nat. Photonics 3(11), 630–632 (2009).
    [Crossref]
  7. B. Schulkin, D. Brigada, J. S. James, T. Tongue, and X. C. Zhang, “Progress toward handheld THz sensing,” Infrared, Millimeter and Terahertz Waves, 20011. IRMMW-THz 2011. 36rd International Conference on, Houston, TX, USA, 2-7 October (2011).
  8. W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
    [Crossref]
  9. W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
    [Crossref]
  10. S. Busch, B. Scherger, M. Scheller, and M. Koch, “Optically controlled terahertz beam steering and imaging,” Opt. Lett. 37(8), 1391–1393 (2012).
    [Crossref] [PubMed]
  11. Q. Li, S. H. Ding, R. Yao, and Q. Wang, “Real-time terahertz scanning imaging by use of a pyroelectric array camera and image denoising,” J. Opt. Soc. Am. A 27(11), 2381–2386 (2010).
    [Crossref] [PubMed]
  12. A. Nahata, J. T. Yardley, and T. F. Heinz, “Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection,” Appl. Phys. Lett. 81(6), 963–965 (2002).
    [Crossref]
  13. S. Katletz, M. Pfleger, H. Pühringer, N. Vieweg, B. Scherger, B. Heinen, M. Koch, and K. Wiesauer, “Efficient terahertz en-face imaging,” Opt. Express 19(23), 23042–23053 (2011).
    [Crossref] [PubMed]
  14. N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
    [Crossref]
  15. I. Daubechies, “The wavelet transform, time-frequency localization and signal analysis,” IEEE Trans. Inf. Theory 36(5), 961–1005 (1990).
    [Crossref]

2012 (1)

2011 (2)

P. Jepsen, D. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – modern techniques and applications,” Laser Photon. Rev. 5(1), 124–166 (2011).
[Crossref]

S. Katletz, M. Pfleger, H. Pühringer, N. Vieweg, B. Scherger, B. Heinen, M. Koch, and K. Wiesauer, “Efficient terahertz en-face imaging,” Opt. Express 19(23), 23042–23053 (2011).
[Crossref] [PubMed]

2010 (2)

2009 (4)

M. Scheller, C. Jansen, and M. Koch, “Analyzing sub-100-μm samples with transmission terahertz time domain spectroscopy,” Opt. Commun. 282(7), 1304–1306 (2009).
[Crossref]

I. Duling and D. Zimdars, “Terahertz imaging: revealing hidden defects,” Nat. Photonics 3(11), 630–632 (2009).
[Crossref]

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

2008 (1)

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

2002 (1)

A. Nahata, J. T. Yardley, and T. F. Heinz, “Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection,” Appl. Phys. Lett. 81(6), 963–965 (2002).
[Crossref]

1996 (1)

1990 (1)

I. Daubechies, “The wavelet transform, time-frequency localization and signal analysis,” IEEE Trans. Inf. Theory 36(5), 961–1005 (1990).
[Crossref]

1985 (1)

Auston, D. H.

Baraniuk, R. G.

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

Beckmann, J.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Brener, I.

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

Busch, S.

Chan, W. L.

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

Charan, K.

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

Chen, H.-T.

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

Cheung, K. P.

Cich, M. J.

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

Cooke, D.

P. Jepsen, D. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – modern techniques and applications,” Laser Photon. Rev. 5(1), 124–166 (2011).
[Crossref]

Daubechies, I.

I. Daubechies, “The wavelet transform, time-frequency localization and signal analysis,” IEEE Trans. Inf. Theory 36(5), 961–1005 (1990).
[Crossref]

Ding, S. H.

Duling, I.

I. Duling and D. Zimdars, “Terahertz imaging: revealing hidden defects,” Nat. Photonics 3(11), 630–632 (2009).
[Crossref]

Ewert, U.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Heinen, B.

Heinz, T. F.

A. Nahata, J. T. Yardley, and T. F. Heinz, “Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection,” Appl. Phys. Lett. 81(6), 963–965 (2002).
[Crossref]

Hochrein, T.

Holzwarth, R.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Jacobsen, R.

Jansen, C.

C. Jansen, S. Wietzke, O. Peters, M. Scheller, N. Vieweg, M. Salhi, N. Krumbholz, C. Jördens, T. Hochrein, and M. Koch, “Terahertz imaging: applications and perspectives,” Appl. Opt. 49(19), E48–E57 (2010).
[Crossref] [PubMed]

M. Scheller, C. Jansen, and M. Koch, “Analyzing sub-100-μm samples with transmission terahertz time domain spectroscopy,” Opt. Commun. 282(7), 1304–1306 (2009).
[Crossref]

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Jepsen, P.

P. Jepsen, D. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – modern techniques and applications,” Laser Photon. Rev. 5(1), 124–166 (2011).
[Crossref]

P. Jepsen, R. Jacobsen, and S. Keiding, “Generation and detection of terahertz pulses from biased semiconductor antennas,” J. Opt. Soc. Am. B 13(11), 2424–2436 (1996).
[Crossref]

Jördens, C.

Katletz, S.

Keiding, S.

Kelly, K. F.

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

Koch, M.

S. Busch, B. Scherger, M. Scheller, and M. Koch, “Optically controlled terahertz beam steering and imaging,” Opt. Lett. 37(8), 1391–1393 (2012).
[Crossref] [PubMed]

S. Katletz, M. Pfleger, H. Pühringer, N. Vieweg, B. Scherger, B. Heinen, M. Koch, and K. Wiesauer, “Efficient terahertz en-face imaging,” Opt. Express 19(23), 23042–23053 (2011).
[Crossref] [PubMed]

P. Jepsen, D. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – modern techniques and applications,” Laser Photon. Rev. 5(1), 124–166 (2011).
[Crossref]

C. Jansen, S. Wietzke, O. Peters, M. Scheller, N. Vieweg, M. Salhi, N. Krumbholz, C. Jördens, T. Hochrein, and M. Koch, “Terahertz imaging: applications and perspectives,” Appl. Opt. 49(19), E48–E57 (2010).
[Crossref] [PubMed]

M. Scheller, C. Jansen, and M. Koch, “Analyzing sub-100-μm samples with transmission terahertz time domain spectroscopy,” Opt. Commun. 282(7), 1304–1306 (2009).
[Crossref]

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Krumbholz, N.

C. Jansen, S. Wietzke, O. Peters, M. Scheller, N. Vieweg, M. Salhi, N. Krumbholz, C. Jördens, T. Hochrein, and M. Koch, “Terahertz imaging: applications and perspectives,” Appl. Opt. 49(19), E48–E57 (2010).
[Crossref] [PubMed]

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Li, Q.

Lubbecke, S.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Mittleman, D. M.

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

Muller-Wirts, T.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Nahata, A.

A. Nahata, J. T. Yardley, and T. F. Heinz, “Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection,” Appl. Phys. Lett. 81(6), 963–965 (2002).
[Crossref]

Peters, O.

Pfleger, M.

Pühringer, H.

Roehle, H.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Salhi, M.

Sartorius, B.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Scheller, M.

S. Busch, B. Scherger, M. Scheller, and M. Koch, “Optically controlled terahertz beam steering and imaging,” Opt. Lett. 37(8), 1391–1393 (2012).
[Crossref] [PubMed]

C. Jansen, S. Wietzke, O. Peters, M. Scheller, N. Vieweg, M. Salhi, N. Krumbholz, C. Jördens, T. Hochrein, and M. Koch, “Terahertz imaging: applications and perspectives,” Appl. Opt. 49(19), E48–E57 (2010).
[Crossref] [PubMed]

M. Scheller, C. Jansen, and M. Koch, “Analyzing sub-100-μm samples with transmission terahertz time domain spectroscopy,” Opt. Commun. 282(7), 1304–1306 (2009).
[Crossref]

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Scherger, B.

Scheunemann, R.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Stanze, D.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Takhar, D.

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

Taylor, A. J.

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

Vieweg, N.

von Chrzanowski, L. S.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Wang, Q.

Wiesauer, K.

Wietzke, S.

Wilk, R.

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Yao, R.

Yardley, J. T.

A. Nahata, J. T. Yardley, and T. F. Heinz, “Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection,” Appl. Phys. Lett. 81(6), 963–965 (2002).
[Crossref]

Zimdars, D.

I. Duling and D. Zimdars, “Terahertz imaging: revealing hidden defects,” Nat. Photonics 3(11), 630–632 (2009).
[Crossref]

Appl. Opt. (1)

Appl. Phys. Lett. (3)

W. L. Chan, K. Charan, D. Takhar, K. F. Kelly, R. G. Baraniuk, and D. M. Mittleman, “A single-pixel terahertz imaging system based on compressed sensing,” Appl. Phys. Lett. 93(12), 121105 (2008).
[Crossref]

W. L. Chan, H.-T. Chen, A. J. Taylor, I. Brener, M. J. Cich, and D. M. Mittleman, “A spatial light modulator for terahertz beams,” Appl. Phys. Lett. 94(21), 213511 (2009).
[Crossref]

A. Nahata, J. T. Yardley, and T. F. Heinz, “Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection,” Appl. Phys. Lett. 81(6), 963–965 (2002).
[Crossref]

IEEE Trans. Inf. Theory (1)

I. Daubechies, “The wavelet transform, time-frequency localization and signal analysis,” IEEE Trans. Inf. Theory 36(5), 961–1005 (1990).
[Crossref]

J. Opt. Soc. Am. A (1)

J. Opt. Soc. Am. B (2)

Laser Photon. Rev. (1)

P. Jepsen, D. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – modern techniques and applications,” Laser Photon. Rev. 5(1), 124–166 (2011).
[Crossref]

Nat. Photonics (1)

I. Duling and D. Zimdars, “Terahertz imaging: revealing hidden defects,” Nat. Photonics 3(11), 630–632 (2009).
[Crossref]

Opt. Commun. (1)

M. Scheller, C. Jansen, and M. Koch, “Analyzing sub-100-μm samples with transmission terahertz time domain spectroscopy,” Opt. Commun. 282(7), 1304–1306 (2009).
[Crossref]

Opt. Express (1)

Opt. Lett. (1)

Proc. SPIE (1)

N. Krumbholz, C. Jansen, M. Scheller, T. Muller-Wirts, S. Lubbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch, “Handheld terahertz spectrometer for the detection of liquid explosives,” Proc. SPIE 7485, 748504, 748504-12 (2009).
[Crossref]

Other (1)

B. Schulkin, D. Brigada, J. S. James, T. Tongue, and X. C. Zhang, “Progress toward handheld THz sensing,” Infrared, Millimeter and Terahertz Waves, 20011. IRMMW-THz 2011. 36rd International Conference on, Houston, TX, USA, 2-7 October (2011).

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Figures (6)

Fig. 1
Fig. 1 Scheme and photograph of one of the used blazed gratings. The grating shown has a groove depth of 414 µm and a period of 1 mm.

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Fig. 2
Fig. 2 (a) Simulated and (b) measured angular dispersion of the used grating (logarithmic scale). Two diffractive orders are covered by the measured frequency range.

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Fig. 3
Fig. 3 (a) Two blazed diffractive gratings, an f-theta lens system and the fiber coupled THz antennas (Tx: transmitter, Rx: receiver) form the imaging setup in transmission geometry. (b) Imaging system in reflection geometry where a silicon beam splitter guides the reflected signal to the detector antenna. In both cases, the focal spots of the spectral components are spread along a focal line.

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Fig. 4
Fig. 4 Reference spectrum of the imaging system. The signal energy is condensed in the first two diffraction orders.

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Fig. 5
Fig. 5 (a) Intensity distribution as a function of spatial position. (b) Transfer function of the measurement of a metal bar which corresponds to a one-dimensional spatial map as the individual frequencies (lower axis) correspond to spatial coordinates (upper axis).

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Fig. 6
Fig. 6 Photograph of the sample consisting of metal characters (a) and a polymer bar with inclusions and drillings (b); (c,d) corresponding THz transmission images. The inset in (c) shows the corresponding result of the reflection measurement of the sample.

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