Terahertz time-domain spectroscopy as a new tool for the characterization of dust forming plasmas

S. Ebbinghaus; K. Schröck; J. C. Schauer; E. Bründermann; M. Heyden; G. Schwaab; M. Böke; J. Winter; M. Tani; M. Havenith

doi:10.1088/0963-0252/15/1/011

Terahertz time-domain spectroscopy as a new tool for the characterization of dust forming plasmas

S. Ebbinghaus, K. Schröck, J. C. Schauer, E. Bründermann, M. Heyden, G. Schwaab, M. Böke, J. Winter, M. Tani, M. Havenith

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41 Scopus citations

Abstract

We report the application of terahertz time-domain spectroscopy as a new tool for plasma diagnostics. The short broadband THz pulses were radiated from a low temperature grown GaAs emitter by free charge carriers which were generated by focusing a 20 femtosecond TiSa-laser pulse onto the emitter. For sensitive signal recording a coherent detection scheme was applied. This allowed the measurement of the amplitude and sign of the electromagnetic field of the THz pulse after passing the plasma chamber. Fourier transformation allowed us to obtain the full spectrum in the frequency domain. We compared the transmitted THz intensities of a pure argon (Ar) and an acetylene (C₂H ₂)/argon plasma. The presence of the ethynyl-radical (CCH) and cyclopropenylidene (c-C₃H₂) in the (C₂H ₂)/argon plasma could be confirmed by the observations of rotational transitions in the region from 8 to 16 cm^-1 corresponding to 0.3-0.5 THz.

Original language	English (US)
Pages (from-to)	72-77
Number of pages	6
Journal	Plasma Sources Science and Technology
Volume	15
Issue number	1
DOIs	https://doi.org/10.1088/0963-0252/15/1/011
State	Published - Feb 1 2006
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

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title = "Terahertz time-domain spectroscopy as a new tool for the characterization of dust forming plasmas",

abstract = "We report the application of terahertz time-domain spectroscopy as a new tool for plasma diagnostics. The short broadband THz pulses were radiated from a low temperature grown GaAs emitter by free charge carriers which were generated by focusing a 20 femtosecond TiSa-laser pulse onto the emitter. For sensitive signal recording a coherent detection scheme was applied. This allowed the measurement of the amplitude and sign of the electromagnetic field of the THz pulse after passing the plasma chamber. Fourier transformation allowed us to obtain the full spectrum in the frequency domain. We compared the transmitted THz intensities of a pure argon (Ar) and an acetylene (C2H 2)/argon plasma. The presence of the ethynyl-radical (CCH) and cyclopropenylidene (c-C3H2) in the (C2H 2)/argon plasma could be confirmed by the observations of rotational transitions in the region from 8 to 16 cm-1 corresponding to 0.3-0.5 THz.",

author = "S. Ebbinghaus and K. Schr{\"o}ck and Schauer, {J. C.} and E. Br{\"u}ndermann and M. Heyden and G. Schwaab and M. B{\"o}ke and J. Winter and M. Tani and M. Havenith",

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doi = "10.1088/0963-0252/15/1/011",

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T1 - Terahertz time-domain spectroscopy as a new tool for the characterization of dust forming plasmas

AU - Ebbinghaus, S.

AU - Schröck, K.

AU - Schauer, J. C.

AU - Bründermann, E.

AU - Heyden, M.

AU - Schwaab, G.

AU - Böke, M.

AU - Winter, J.

AU - Tani, M.

AU - Havenith, M.

PY - 2006/2/1

Y1 - 2006/2/1

N2 - We report the application of terahertz time-domain spectroscopy as a new tool for plasma diagnostics. The short broadband THz pulses were radiated from a low temperature grown GaAs emitter by free charge carriers which were generated by focusing a 20 femtosecond TiSa-laser pulse onto the emitter. For sensitive signal recording a coherent detection scheme was applied. This allowed the measurement of the amplitude and sign of the electromagnetic field of the THz pulse after passing the plasma chamber. Fourier transformation allowed us to obtain the full spectrum in the frequency domain. We compared the transmitted THz intensities of a pure argon (Ar) and an acetylene (C2H 2)/argon plasma. The presence of the ethynyl-radical (CCH) and cyclopropenylidene (c-C3H2) in the (C2H 2)/argon plasma could be confirmed by the observations of rotational transitions in the region from 8 to 16 cm-1 corresponding to 0.3-0.5 THz.

AB - We report the application of terahertz time-domain spectroscopy as a new tool for plasma diagnostics. The short broadband THz pulses were radiated from a low temperature grown GaAs emitter by free charge carriers which were generated by focusing a 20 femtosecond TiSa-laser pulse onto the emitter. For sensitive signal recording a coherent detection scheme was applied. This allowed the measurement of the amplitude and sign of the electromagnetic field of the THz pulse after passing the plasma chamber. Fourier transformation allowed us to obtain the full spectrum in the frequency domain. We compared the transmitted THz intensities of a pure argon (Ar) and an acetylene (C2H 2)/argon plasma. The presence of the ethynyl-radical (CCH) and cyclopropenylidene (c-C3H2) in the (C2H 2)/argon plasma could be confirmed by the observations of rotational transitions in the region from 8 to 16 cm-1 corresponding to 0.3-0.5 THz.

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JO - Plasma Sources Science and Technology

JF - Plasma Sources Science and Technology

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ER -

Terahertz time-domain spectroscopy as a new tool for the characterization of dust forming plasmas

Abstract

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