Abstract

Terahertz (THz) radiation has the characteristics of penetrating nonmetallic and nonpolar materials that are opaque to visible light, which makes THz digital holography have an application potential of imaging concealed objects with certain barriers. A CO2 pumped continuous THz Gabor inline digital holographic imaging system was utilized to conduct experimental researches on imaging concealed objects. Paper, Teflon, a plastic express envelope, and silicon wafers were used as barriers. High-quality reconstructed images were obtained. Compared with the reconstruction results without any barriers, the results verify the feasibility of THz Gabor inline digital holography in imaging concealed objects.

© 2012 Optical Society of America

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2012

Q. Li, S. H. Ding, Y. D. Li, and Q. Wang, “Experimental research on resolution improvement in cw THz digital holography,” Appl. Phys. B 107, 103–110 (2012).
[CrossRef]

K. Xue, Q. Li, Y.-D. Li, and Q. Wang, “Continuous-wave terahertz inline digital holography,” Opt. Lett. 37, 3228–3230 (2012).
[CrossRef]

2011

2008

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
[CrossRef]

A. R. Sanchez and X.-C. Zhang, “Terahertz science and technology trends,” IEEE J. Sel. Top. Quantum Electron. 14, 260–269 (2008).
[CrossRef]

B. N. Behnken and G. Karunasiri, “Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications,” Proc. SPIE 7117, 711705 (2008).
[CrossRef]

2006

A. W. M. Lee, B. S. Williams, and S. Kumar, “Real-time imaging using a 4.3 THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
[CrossRef]

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Digital holography at millimetre wavelengths,” Opt. Commun. 260, 469–473 (2006).
[CrossRef]

2005

A. W. M. Lee and Q. Hu, “Real-time, continuous-wave terahertz imaging by use of a microbolometer focal-plane array,” Opt. Lett. 30, 2563–2565 (2005).
[CrossRef]

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]

L. Denis, C. Fournier, T. Fournel, and C. Ducottet, “Twin-image noise reduction by phase retrieval in inline digital holography,” Proc. SPIE 5914, 59140J(2005).
[CrossRef]

2003

Balandin, A. L.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Behnken, B. N.

B. N. Behnken and G. Karunasiri, “Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications,” Proc. SPIE 7117, 711705 (2008).
[CrossRef]

Cherkassky, V. S.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Choporova, Y. Y.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Cui, Y.

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
[CrossRef]

Demyanenko, M. A.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Denis, L.

L. Denis, C. Fournier, T. Fournel, and C. Ducottet, “Twin-image noise reduction by phase retrieval in inline digital holography,” Proc. SPIE 5914, 59140J(2005).
[CrossRef]

Ding, S. H.

Q. Li, S. H. Ding, Y. D. Li, and Q. Wang, “Experimental research on resolution improvement in cw THz digital holography,” Appl. Phys. B 107, 103–110 (2012).
[CrossRef]

Ding, S.-H.

Ducottet, C.

L. Denis, C. Fournier, T. Fournel, and C. Ducottet, “Twin-image noise reduction by phase retrieval in inline digital holography,” Proc. SPIE 5914, 59140J(2005).
[CrossRef]

Esaev, D. G.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Everitt, H. O.

Fournel, T.

L. Denis, C. Fournier, T. Fournel, and C. Ducottet, “Twin-image noise reduction by phase retrieval in inline digital holography,” Proc. SPIE 5914, 59140J(2005).
[CrossRef]

Fournier, C.

L. Denis, C. Fournier, T. Fournel, and C. Ducottet, “Twin-image noise reduction by phase retrieval in inline digital holography,” Proc. SPIE 5914, 59140J(2005).
[CrossRef]

Gerasimov, V. V.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Gregory, D. A.

Heimbeck, M. S.

Hu, Q.

Hwang, J.-S.

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]

Inoue, H.

Karpowicz, N.

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]

Karunasiri, G.

B. N. Behnken and G. Karunasiri, “Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications,” Proc. SPIE 7117, 711705 (2008).
[CrossRef]

Kawase, K.

Kim, M. K.

Knyazev, B. A.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Kozlov, S. V.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Kubarev, V. V.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Kulipanov, G. N.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Kumar, S.

A. W. M. Lee, B. S. Williams, and S. Kumar, “Real-time imaging using a 4.3 THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
[CrossRef]

Lanigan, W.

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Digital holography at millimetre wavelengths,” Opt. Commun. 260, 469–473 (2006).
[CrossRef]

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Terahertz holographic image reconstruction and analysis,” in 2004 Joint 29th International Conference on Infrared and Millimeter Waves (IEEE, 2004), pp. 749–750.
[CrossRef]

Lee, A. W. M.

A. W. M. Lee, B. S. Williams, and S. Kumar, “Real-time imaging using a 4.3 THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
[CrossRef]

A. W. M. Lee and Q. Hu, “Real-time, continuous-wave terahertz imaging by use of a microbolometer focal-plane array,” Opt. Lett. 30, 2563–2565 (2005).
[CrossRef]

Li, Q.

Li, Y. D.

Q. Li, S. H. Ding, Y. D. Li, and Q. Wang, “Experimental research on resolution improvement in cw THz digital holography,” Appl. Phys. B 107, 103–110 (2012).
[CrossRef]

Li, Y.-D.

Lin, K.-I.

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]

Mahon, R.

I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
[CrossRef]

Mahon, R. J.

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Digital holography at millimetre wavelengths,” Opt. Commun. 260, 469–473 (2006).
[CrossRef]

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Terahertz holographic image reconstruction and analysis,” in 2004 Joint 29th International Conference on Infrared and Millimeter Waves (IEEE, 2004), pp. 749–750.
[CrossRef]

Matveenko, A. N.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

McAuley, I.

I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
[CrossRef]

McCarthy, D.

I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
[CrossRef]

McLaughlin, P.

I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
[CrossRef]

Murphy, J. A.

I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
[CrossRef]

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Digital holography at millimetre wavelengths,” Opt. Commun. 260, 469–473 (2006).
[CrossRef]

R. J. Mahon, J. A. Murphy, and W. Lanigan, “Terahertz holographic image reconstruction and analysis,” in 2004 Joint 29th International Conference on Infrared and Millimeter Waves (IEEE, 2004), pp. 749–750.
[CrossRef]

Nikitin, A. A.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Ogawa, Y.

Pickalov, V. V.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Popik, V. M.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Rodionov, D. G.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Root, D. N.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Rudych, P. D.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Sanchez, A. R.

A. R. Sanchez and X.-C. Zhang, “Terahertz science and technology trends,” IEEE J. Sel. Top. Quantum Electron. 14, 260–269 (2008).
[CrossRef]

Shevchenko, O. A.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

Sun, W.

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
[CrossRef]

Trappe, N.

I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
[CrossRef]

Trifutina, A. V.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
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Vinokurov, N. A.

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

Vlasenko, M. G.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
[CrossRef]

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Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
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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).
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A. R. Sanchez and X.-C. Zhang, “Terahertz science and technology trends,” IEEE J. Sel. Top. Quantum Electron. 14, 260–269 (2008).
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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).
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Zhang, Y.

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
[CrossRef]

Zhong, H.

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).
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Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
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Q. Li, S. H. Ding, Y. D. Li, and Q. Wang, “Experimental research on resolution improvement in cw THz digital holography,” Appl. Phys. B 107, 103–110 (2012).
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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]

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A. R. Sanchez and X.-C. Zhang, “Terahertz science and technology trends,” IEEE J. Sel. Top. Quantum Electron. 14, 260–269 (2008).
[CrossRef]

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A. W. M. Lee, B. S. Williams, and S. Kumar, “Real-time imaging using a 4.3 THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
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I. McAuley, J. A. Murphy, N. Trappe, R. Mahon, D. McCarthy, and P. McLaughlin, “Applications of holography in the millimeter-wave and terahertz region,” Proc. SPIE 7939, 79380H (2011).
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B. N. Behnken and G. Karunasiri, “Real-time terahertz imaging of nonmetallic objects for security screening and anti-counterfeiting applications,” Proc. SPIE 7117, 711705 (2008).
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Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, “Terahertz digital holography,” Strain 44, 380–385 (2008).
[CrossRef]

Other

V. S. Cherkassky, B. A. Knyazev, S. V. Kozlov, V. V. Kubarev, G. N. Kulipanov, A. N. Matveenko, V. M. Popik, D. N. Root, P. D. Rudych, O. A. Shevchenko, A. V. Trifutina, and N. A. Vinokurov, “Terahertz imaging and holography with a high-power free electron laser,” in 2005 Joint 30th International Conference on Infrared and Millimeter Waves & 13th International Conference on Terahertz Electronics, Vol. 2 (IEEE, 2005), pp. 337–338.
[CrossRef]

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Demyanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, “Classic holography, tomography and speckle metrology using a high-power terahertz free electron laser and real-time image detectors,” in 2010 International Conference on Infrared, Millimeter, and Terahertz Waves (IEEE, 2010), pp. 1–3.
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Figures (9)

Fig. 1.
Fig. 1.

Picture of the experimental setup for recording a Gabor inline hologram.

Fig. 2.
Fig. 2.

Illumination light field distribution and field distributions penetrating barriers: (a) illumination light field distribution (b) paper, (c) Teflon, (d) plastic express envelope, and (e) silicon wafer.

Fig. 3.
Fig. 3.

0.3 mm resolution chart object: (a) lateral stripes object and (b) longitudinal stripes object.

Fig. 4.
Fig. 4.

Reconstruction result of the 0.3 mm resolution chart object without barriers: (a) lateral stripes object and (b) longitudinal stripes object.

Fig. 5.
Fig. 5.

Reconstruction results of 0.3 mm lateral stripes after penetrating different barriers: (a) hologram after penetrating a paper, (b) reconstructed image of (a), (c) enlarged image of (b), (d) hologram after penetrating Teflon, (e) reconstructed image of (d), (f) enlarged image of (e), (g) hologram after penetrating a plastic express envelope, (h) reconstructed image of (g), (i) enlarged image of (h), (k) hologram after penetrating a silicon wafer, (j) reconstructed image of (k), (l) enlarged image of (j).

Fig. 6.
Fig. 6.

Reconstruction results of 0.3 mm longitudinal stripes after penetrating different barriers: (a) hologram after penetrating a paper, (b) reconstructed image of (a), (c) enlarged image of (b), (d) hologram after penetrating Teflon, (e) reconstructed image of (d), (f) enlarged image of (e), (g) hologram after penetrating a plastic express envelope, (h) reconstructed image of (g), (i) enlarged image of (h), (k) hologram after penetrating a silicon wafer, (j) reconstructed image of (k), (l) enlarged image of (j).

Fig. 7.
Fig. 7.

Picture of a sheet metal object.

Fig. 8.
Fig. 8.

Reconstruction results of the sheet metal object after penetrating a paper: (a) single-frame hologram without a barrier, (b) reconstructed image of (a), (c) single-frame hologram after being blocked partially by a paper, (d) reconstructed image of (c), (e) 20-frame hologram after being blocked completely by a paper, and (f) reconstructed image of (e).

Fig. 9.
Fig. 9.

Reconstruction results of the sheet metal object after penetrating a polyethylene express envelope: (a) single-frame hologram without a barrier, (b) reconstructed image of (a), (c) single-frame hologram after being blocked completely by a polyethylene express envelope, and (d) reconstructed image of (c).

Equations (4)

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U ( x 0 , y 0 ) = 1 a ( x 0 , y 0 ) ,
I ˜ ( x , y ) 1 a ( x 0 , y 0 ) * h z ( x 0 , y 0 , z ) a * ( x 0 , y 0 ) * h z * ( x 0 , y 0 , z ) ,
U ( x I , y I ) = U ( x 0 , y 0 ) a * ( x 0 , y 0 ) * h 2 z * ( x 0 , y 0 , z ) .
| z | X ( | z | X ) max = { 1 ( λ / Δ x ) 2 1 4 [ ( Y X ) 2 + 1 ] if Y X Δ y Δ x 1 ( Y / X ) 2 ( Δ y / Δ x ) 2 ( λ / Δ x ) 2 1 4 [ ( Y X ) 2 + 1 ] if Y X Δ y Δ x 1 ,

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