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THz photomixer with milled nanoelectrodes on LT-GaAs

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Abstract

A terahertz (THz) photomixer: (i) a meander type antenna with integrated nanoelectrodes on (ii) a low temperature grown GaAs has been fabricated and characterized. It was designed for spectral range of 0.3–0.4 THz where molecular fingerprinting and sensing are performed. By combination of electron beam lithography with post-processing using focused ion beam (FIB), milling the THz emitter was successfully fabricated. Nanogaps as small as 40 nm width in the active area of photomixer were milled by FIB. Nanocontacts enhance electric fields of the illuminated and THz radiation and contribute to a better collection of photo-electrons. THz emission was obtained and spectrally characterized.

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Acknowledgments

Support via Australian Research Council Discovery DP130101205, DP120102980 and Linkage LP120100161 Grant with Raith-Asia is acknowledged. The THz experimental setup was supported by the Australian Research Council and the University of Wollongong.

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Authors and Affiliations

  1. Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia

    Gediminas Seniutinas, Gediminas Gervinskas & Saulius Juodkazis

  2. Melbourne Centre for Nanofabrication, Australian National Fabrication Facility, Clayton, VIC, 3168, Australia

    Gediminas Seniutinas, Gediminas Gervinskas & Saulius Juodkazis

  3. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2522, Australia

    Evan Constable & Roger A. Lewis

  4. Center for Physical Sciences and Technology, Vilnius, 01108, Lithuania

    Arūnas Krotkus & Gintaras Valušis

  5. Teravil Ltd, Vilnius, 01108, Lithuania

    Gediminas Molis

Authors
  1. Gediminas Seniutinas
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  2. Gediminas Gervinskas
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  3. Evan Constable
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  4. Arūnas Krotkus
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  5. Gediminas Molis
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  6. Gintaras Valušis
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  7. Roger A. Lewis
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  8. Saulius Juodkazis
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Correspondence to Gediminas Seniutinas.

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Seniutinas, G., Gervinskas, G., Constable, E. et al. THz photomixer with milled nanoelectrodes on LT-GaAs. Appl. Phys. A 117, 439–444 (2014). https://doi.org/10.1007/s00339-014-8685-8

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  • DOI: https://doi.org/10.1007/s00339-014-8685-8

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