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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 2 — Feb. 1, 2014
  • pp: 291–295

Terahertz emission enhancement in low-temperature-grown GaAs with an n-GaAs buffer in reflection and transmission excitation geometries

Elizabeth Ann P. Prieto, Sheryl Ann B. Vizcara, Armando S. Somintac, Arnel A. Salvador, Elmer S. Estacio, Christopher T. Que, Kohji Yamamoto, and Masahiko Tani  »View Author Affiliations


JOSA B, Vol. 31, Issue 2, pp. 291-295 (2014)
http://dx.doi.org/10.1364/JOSAB.31.000291


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Abstract

The growth of low-temperature-grown GaAs (LTG-GaAs) on semi-insulating GaAs substrate with a 0.2 μm n-GaAs buffer demonstrated enhanced terahertz (THz) emission in reflection and transmission excitation geometries via time-domain spectroscopy. The transient photocurrent of the sample in reflection and transmission geometries resulting from ultrafast excitation yielded a 215% and 165% increase in the THz emission, respectively, as compared with a sample grown with an undoped GaAs buffer. The LTG-GaAs film with n-GaAs buffer exhibited a significant increase in its built-in field as supported by calculations and photoreflectance experiments. The enhanced THz emission intensity was comparable with bulk p-InAs.

© 2014 Optical Society of America

OCIS Codes
(160.6000) Materials : Semiconductor materials
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: July 17, 2013
Revised Manuscript: November 29, 2013
Manuscript Accepted: December 5, 2013
Published: January 17, 2014

Citation
Elizabeth Ann P. Prieto, Sheryl Ann B. Vizcara, Armando S. Somintac, Arnel A. Salvador, Elmer S. Estacio, Christopher T. Que, Kohji Yamamoto, and Masahiko Tani, "Terahertz emission enhancement in low-temperature-grown GaAs with an n-GaAs buffer in reflection and transmission excitation geometries," J. Opt. Soc. Am. B 31, 291-295 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-2-291


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