Abstract

Recently reported asynchronous-optical-sampling terahertz (THz) time-domain spectroscopy enables high-resolution spectroscopy due to a long time-delay window. However, a long-lasting tail signal following the main pulse is often measured in a time-domain waveform, resulting in spectral fluctuation above a background noise level on a high-resolution THz amplitude spectrum. Here, we adopt the wavelet power spectrum estimation technique (WPSET) to effectively remove the spectral fluctuation without sacrificing spectral features. Effectiveness of the WPSET is verified by investigating a transmission spectrum of water vapor.

© 2011 Optical Society of Korea

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  1. Y.-S. Lee, Principles of Terahertz Science and Technology(Springer, New York, USA, 2009), Chapter 3.
  2. M. van Exter, Ch. Fattinger, and D. Grischkowsky, “Terahertztime-domain spectroscopy of water vapor,” Opt. Lett. 14,1128-1130 (1989).
    [CrossRef]
  3. B. E. Cole, J. B. Williams, B. T. King, M. S. Sherwin,and C. R. Stanley, “Coherent manipulation of semiconductorquantum bits with terahertz radiation,” Nature 410, 60-63(2001).
    [CrossRef]
  4. E. Pickwell and V. P. Wallace, “Biomedical applications ofterahertz technology,” J. Phys. D: Appl. Phys. 39, R301-R310(2006).
    [CrossRef]
  5. H. Hoshina, T. Seta, T. Iwamoto, I. Hosako, C. Otani, andY. Kasai, “Precise measurement of pressure broadening parametersfor water vapor with a terahertz time-domain spectrometer,”J. Quant. Spectrosc. Radiat. Transfer. 109, 2303-2314 (2008).
    [CrossRef]
  6. G. J. Kim, S. G. Jeon, J. I. Kim, and Y. S. Jin, “Highspeed scanning of terahertz pulse by a rotary optical delayline,” Rev. Sci. Instrum. 79, 106102-1-106102-3 (2008).
    [CrossRef]
  7. C. Janke, M. Forst, M. Nagel, and H. Kurz, “Asynchronousoptical sampling for high-speed characterization of integratedresonant terahertz sensors,” Opt. Lett. 30, 1405-1407 (2005).
    [CrossRef]
  8. T. Yasui, E. Saneyoshi, and T. Araki, “Asynchronous opticalsampling terahertz time-domain spectroscopy for ultrahighspectral resolution and rapid data acquisition,” Appl. Phys.Lett. 87, 061101-1-061101-3 (2005).
    [CrossRef]
  9. A. Bartels, A. Thoma, C. Janke, T. Dekorsy, A. Dreyhaupt,S. Winnerl, and M. Helm, “High-resolution THz spectrometerwith kHz scan rates,” Opt. Express 14, 430-437 (2006).
    [CrossRef]
  10. A. Bartels, R. Cerna, C. Kistner, A. Thoma, F. Hudert, C.Janke, and T. Dekorsy, “Ultrafast time-domain spectroscopybased on high-speed asynchronous optical sampling,” Rev.Sci. Instrum. 78, 035107-1-035107-8 (2007).
    [CrossRef]
  11. C. Kistner, A. Andre, T. Fischer, A. Thoma, C. Janke, A.Bartels, T. Gisler, G. Maret, and T. Dekorsy, “Hydrationdynamics of oriented DNA films investigated by time-domainterahertz spectroscopy,” Appl. Phys. Lett. 90, 233908-1-233908-3 (2007).
  12. D. M. Mittleman, R. H. Jacobsen, R. Neelamani, R. G.Baraniuk, and M. C. Nuss, “Gas sensing using terahertztime-domain spectroscopy,” Appl. Phys. B 67, 379-390 (1998).
    [CrossRef]
  13. B. Ferguson and D. Abbott, “De-noising techniques forterahertz responses of biological samples,” MicroelectronicsJournal 32, 943-953 (2001).
    [CrossRef]
  14. B. Ferguson and D. Abbott, “Wavelet de-noising of opticalterahertz pulse imaging data,” Fluctuation and Noise Letters1, L65-L69 (2001).
    [CrossRef]
  15. D. M. Mittleman, M. Gupta, R. Neelamani, R. G. Baraniuk,J. V. Rudd, and M. Koch, “Recent advances in terahertzimaging,” Appl. Phys. B 68, 1085-1094 (1999).
    [CrossRef]
  16. S. G. Mallat, A Wavelet Tour of Signal Processing (ElsevierAcademic Press, Burlington, MA, USA, 1999), Chapter 7, 9, 10.
  17. P. Moulin, “Wavelet thresholding techniques for power spectrumestimation,” IEEE Trans. Signal Processing 42, 3126-3136(1994).
    [CrossRef]
  18. D. L. Donoho and I. M. Johnstone, “Ideal spatial adaptationby wavelet shrinkage,” Biometrika 81, 425-455 (1994).
    [CrossRef]

2009

Y.-S. Lee, Principles of Terahertz Science and Technology(Springer, New York, USA, 2009), Chapter 3.

2008

H. Hoshina, T. Seta, T. Iwamoto, I. Hosako, C. Otani, andY. Kasai, “Precise measurement of pressure broadening parametersfor water vapor with a terahertz time-domain spectrometer,”J. Quant. Spectrosc. Radiat. Transfer. 109, 2303-2314 (2008).
[CrossRef]

G. J. Kim, S. G. Jeon, J. I. Kim, and Y. S. Jin, “Highspeed scanning of terahertz pulse by a rotary optical delayline,” Rev. Sci. Instrum. 79, 106102-1-106102-3 (2008).
[CrossRef]

2007

A. Bartels, R. Cerna, C. Kistner, A. Thoma, F. Hudert, C.Janke, and T. Dekorsy, “Ultrafast time-domain spectroscopybased on high-speed asynchronous optical sampling,” Rev.Sci. Instrum. 78, 035107-1-035107-8 (2007).
[CrossRef]

C. Kistner, A. Andre, T. Fischer, A. Thoma, C. Janke, A.Bartels, T. Gisler, G. Maret, and T. Dekorsy, “Hydrationdynamics of oriented DNA films investigated by time-domainterahertz spectroscopy,” Appl. Phys. Lett. 90, 233908-1-233908-3 (2007).

2006

E. Pickwell and V. P. Wallace, “Biomedical applications ofterahertz technology,” J. Phys. D: Appl. Phys. 39, R301-R310(2006).
[CrossRef]

A. Bartels, A. Thoma, C. Janke, T. Dekorsy, A. Dreyhaupt,S. Winnerl, and M. Helm, “High-resolution THz spectrometerwith kHz scan rates,” Opt. Express 14, 430-437 (2006).
[CrossRef]

2005

C. Janke, M. Forst, M. Nagel, and H. Kurz, “Asynchronousoptical sampling for high-speed characterization of integratedresonant terahertz sensors,” Opt. Lett. 30, 1405-1407 (2005).
[CrossRef]

T. Yasui, E. Saneyoshi, and T. Araki, “Asynchronous opticalsampling terahertz time-domain spectroscopy for ultrahighspectral resolution and rapid data acquisition,” Appl. Phys.Lett. 87, 061101-1-061101-3 (2005).
[CrossRef]

2001

B. E. Cole, J. B. Williams, B. T. King, M. S. Sherwin,and C. R. Stanley, “Coherent manipulation of semiconductorquantum bits with terahertz radiation,” Nature 410, 60-63(2001).
[CrossRef]

B. Ferguson and D. Abbott, “De-noising techniques forterahertz responses of biological samples,” MicroelectronicsJournal 32, 943-953 (2001).
[CrossRef]

B. Ferguson and D. Abbott, “Wavelet de-noising of opticalterahertz pulse imaging data,” Fluctuation and Noise Letters1, L65-L69 (2001).
[CrossRef]

1999

D. M. Mittleman, M. Gupta, R. Neelamani, R. G. Baraniuk,J. V. Rudd, and M. Koch, “Recent advances in terahertzimaging,” Appl. Phys. B 68, 1085-1094 (1999).
[CrossRef]

S. G. Mallat, A Wavelet Tour of Signal Processing (ElsevierAcademic Press, Burlington, MA, USA, 1999), Chapter 7, 9, 10.

1998

D. M. Mittleman, R. H. Jacobsen, R. Neelamani, R. G.Baraniuk, and M. C. Nuss, “Gas sensing using terahertztime-domain spectroscopy,” Appl. Phys. B 67, 379-390 (1998).
[CrossRef]

1994

P. Moulin, “Wavelet thresholding techniques for power spectrumestimation,” IEEE Trans. Signal Processing 42, 3126-3136(1994).
[CrossRef]

D. L. Donoho and I. M. Johnstone, “Ideal spatial adaptationby wavelet shrinkage,” Biometrika 81, 425-455 (1994).
[CrossRef]

1989

Appl. Phys. B

D. M. Mittleman, R. H. Jacobsen, R. Neelamani, R. G.Baraniuk, and M. C. Nuss, “Gas sensing using terahertztime-domain spectroscopy,” Appl. Phys. B 67, 379-390 (1998).
[CrossRef]

D. M. Mittleman, M. Gupta, R. Neelamani, R. G. Baraniuk,J. V. Rudd, and M. Koch, “Recent advances in terahertzimaging,” Appl. Phys. B 68, 1085-1094 (1999).
[CrossRef]

Appl. Phys. Lett.

T. Yasui, E. Saneyoshi, and T. Araki, “Asynchronous opticalsampling terahertz time-domain spectroscopy for ultrahighspectral resolution and rapid data acquisition,” Appl. Phys.Lett. 87, 061101-1-061101-3 (2005).
[CrossRef]

C. Kistner, A. Andre, T. Fischer, A. Thoma, C. Janke, A.Bartels, T. Gisler, G. Maret, and T. Dekorsy, “Hydrationdynamics of oriented DNA films investigated by time-domainterahertz spectroscopy,” Appl. Phys. Lett. 90, 233908-1-233908-3 (2007).

Biometrika

D. L. Donoho and I. M. Johnstone, “Ideal spatial adaptationby wavelet shrinkage,” Biometrika 81, 425-455 (1994).
[CrossRef]

Fluctuation and Noise Letters

B. Ferguson and D. Abbott, “Wavelet de-noising of opticalterahertz pulse imaging data,” Fluctuation and Noise Letters1, L65-L69 (2001).
[CrossRef]

IEEE Trans. Signal Processing

P. Moulin, “Wavelet thresholding techniques for power spectrumestimation,” IEEE Trans. Signal Processing 42, 3126-3136(1994).
[CrossRef]

J. Phys. D: Appl. Phys.

E. Pickwell and V. P. Wallace, “Biomedical applications ofterahertz technology,” J. Phys. D: Appl. Phys. 39, R301-R310(2006).
[CrossRef]

J. Quant. Spectrosc. Radiat. Transfer.

H. Hoshina, T. Seta, T. Iwamoto, I. Hosako, C. Otani, andY. Kasai, “Precise measurement of pressure broadening parametersfor water vapor with a terahertz time-domain spectrometer,”J. Quant. Spectrosc. Radiat. Transfer. 109, 2303-2314 (2008).
[CrossRef]

Microelectronics Journal

B. Ferguson and D. Abbott, “De-noising techniques forterahertz responses of biological samples,” MicroelectronicsJournal 32, 943-953 (2001).
[CrossRef]

Nature

B. E. Cole, J. B. Williams, B. T. King, M. S. Sherwin,and C. R. Stanley, “Coherent manipulation of semiconductorquantum bits with terahertz radiation,” Nature 410, 60-63(2001).
[CrossRef]

Opt. Express

Opt. Lett.

Rev. Sci. Instrum.

A. Bartels, R. Cerna, C. Kistner, A. Thoma, F. Hudert, C.Janke, and T. Dekorsy, “Ultrafast time-domain spectroscopybased on high-speed asynchronous optical sampling,” Rev.Sci. Instrum. 78, 035107-1-035107-8 (2007).
[CrossRef]

G. J. Kim, S. G. Jeon, J. I. Kim, and Y. S. Jin, “Highspeed scanning of terahertz pulse by a rotary optical delayline,” Rev. Sci. Instrum. 79, 106102-1-106102-3 (2008).
[CrossRef]

Other

Y.-S. Lee, Principles of Terahertz Science and Technology(Springer, New York, USA, 2009), Chapter 3.

S. G. Mallat, A Wavelet Tour of Signal Processing (ElsevierAcademic Press, Burlington, MA, USA, 1999), Chapter 7, 9, 10.

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