Cited by 40Terahertz technology and applicationsNanowire Synthesis and ApplicationsGyrotron and Vacuum Electronics Research

Strong Terahertz Emission and Its Origin from Catalyst-Free InAs Nanowire Arrays

Arlauskas, Andrius, Treu, Julian, Saller, Kai, Beleckaitė, Ieva, Koblmüller, Gregor, Krotkus, Aru̅nas·2014·Nano Letters

Abstract

The unique features of nanowires (NW), such as the high aspect ratio and extensive surface area, are expected to play a key role in the development of very efficient semiconductor surface emitters in the terahertz (THz) spectral range. Here, we report on optically excited THz emission from catalyst-free grown arrays of intrinsically n-type InAs NWs using THz time-domain spectroscopy. Depending on the aspect ratio, the THz emission efficiency of the n-type InAs NWs is found to be up to ∼3 times stronger than that of bulk p-type InAs, known as currently the most efficient semiconductor-based THz surface emitter. Characteristic differences from bulk p-type InAs are particularly revealed from excitation wavelength-dependent measurements, showing monotonously increasing THz pulse amplitude in the NW arrays with increasing photon energy. Further polarization-dependent and two-color pump-probe experiments elucidate the physical mechanism of the THz emission: In contrast to bulk p-type InAs, where the anisotropic photoconductivity in the surface electric field is the dominant cause for THz pulse generation, the origin of the intrinsic THz emission in the NWs is based on the photo-Dember effect. The strong THz emission from high aspect ratio NW arrays further suggests an improved out-coupling of the radiation, while further enhancements in efficiency using core-shell NW geometries are discussed.

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Crossref · 10.1021/nl404737r

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  • The photo-Dember effect arising from unequal electron-hole diffusion rates is a common source of charge currents in nanowires, often in addition to or in competition with junction fields, depending on doping type.

    “The photo-Dember effect arising from unequal electron-hole diffusion rates is a common source of charge currents in nanowires31,222–224, often in addition to or in competition with junction fields221,222, depending on doping type.”

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Authors
Arlauskas, A., Treu, J., Saller, K., Beleckaitė, I., Koblmüller, G., & Krotkus, A.
Affiliations
  • Center for Physical Sciences and Technology (LT)
  • Technical University of Munich (DE)
  • Center for Physical Sciences and Technology, 01180, A. Goštauto 11, Vilnius, Lithuania
Corresponding author
Koblmüller, Gregor
Venue
Nano Letters
Published
2014-02-10
Volume
14
Issue
3
Pages
1508-1514
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
OpenAlex
W2332582845
Cited by
40
References
33
Citations by year
2025: 3 · 2023: 3 · 2022: 1 · 2021: 6 · 2020: 3 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 3 · 2015: 5 · 2014: 3
FWCI
2.66
Type
journal article
Language
en
Open access
closed
Locations
  • Nano Letters (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsche Forschungsgemeinschaft
  • Lietuvos Mokslo Taryba
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
  • Physical Sciences › Engineering › Biomedical Engineering › Nanowire Synthesis and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Gyrotron and Vacuum Electronics Research
Keywords
terahertz emission, InAs nanowires, catalyst-free growth, nanowire arrays, photo-Dember effect, aspect ratio, excitation wavelength dependence, polarization dependence, two-color pump-probe, core-shell nanowires

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