Drift current dominated terahertz radiation from InN at low-density excitation

Kuang-I Lin, J. T. Tsai, T. S. Wang, J. S. Hwang, M. C. Chen, G. C. Chi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This letter investigates the polarity of terahertz radiation from indium nitride (InN) excited by femtosecond optical pulses wherein a central wavelength of around 790 nm is measured. The InN epilayers are grown by metalorganic chemical vapor deposition on sapphire and silicon substrates. The polarity of the terahertz radiation field from InN is opposite to that from p-InAs whose radiation mechanism is dominated by the photo-Dember effect indicating that the dominant radiation mechanism in InN is the drift current induced by the internal electric field at low-density excitation below 590 nJ/cm2. The internal electric field consists of the surface accumulation field and the spontaneous polarization-induced electric field. In addition, since no azimuthal angle dependence of the terahertz radiation is observed, the optical rectification effect is ruled out. By comparing the wave forms of terahertz radiation from the front and the back of the InN sample grown on sapphire in reflection geometry, the N polarity of the InN sample is confirmed.

Original languageEnglish
Article number262102
JournalApplied Physics Letters
Volume93
Issue number26
DOIs
Publication statusPublished - 2008 Dec 1

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nitrides
indium
radiation
excitation
polarity
electric fields
sapphire
rectification
radiation distribution
metalorganic chemical vapor deposition
silicon
polarization
geometry
pulses
wavelengths

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Lin, K-I., Tsai, J. T., Wang, T. S., Hwang, J. S., Chen, M. C., & Chi, G. C. (2008). Drift current dominated terahertz radiation from InN at low-density excitation. Applied Physics Letters, 93(26), [262102]. https://doi.org/10.1063/1.3056635
Lin, Kuang-I ; Tsai, J. T. ; Wang, T. S. ; Hwang, J. S. ; Chen, M. C. ; Chi, G. C. / Drift current dominated terahertz radiation from InN at low-density excitation. In: Applied Physics Letters. 2008 ; Vol. 93, No. 26.
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Drift current dominated terahertz radiation from InN at low-density excitation. / Lin, Kuang-I; Tsai, J. T.; Wang, T. S.; Hwang, J. S.; Chen, M. C.; Chi, G. C.

In: Applied Physics Letters, Vol. 93, No. 26, 262102, 01.12.2008.

Research output: Contribution to journalArticle

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AU - Lin, Kuang-I

AU - Tsai, J. T.

AU - Wang, T. S.

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AU - Chi, G. C.

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