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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Arrayed free space continuous-wave terahertz photomixers.

S T Bauerschmidt, G H Döhler, H Lu

    Optics Letters
    |October 10, 2013
    PubMed
    Summary
    This summary is machine-generated.

    We developed free-space terahertz (THz) photomixer arrays for enhanced spectroscopy and imaging. These arrays enable beam steering and improve THz power distribution, offering a wide bandwidth for advanced applications.

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    Area of Science:

    • Terahertz (THz) science and technology
    • Optoelectronics
    • Array antenna systems

    Background:

    • Continuous-wave terahertz (THz) photomixers are crucial for various applications.
    • On-chip arrays have limitations in power distribution and beam control.
    • Free-space THz systems require efficient beam steering and intensity enhancement.

    Purpose of the Study:

    • To present and evaluate free-space coherent arrays of continuous-wave THz photomixers.
    • To compare their performance against on-chip arrays.
    • To demonstrate enhanced THz power distribution and beam steering capabilities.

    Main Methods:

    • Fabrication of free-space coherent arrays of continuous-wave THz photomixers.
    • Tuning relative THz phase by altering laser signal phases for beam steering.
    • Utilizing constructive interference for intensity enhancement and beam narrowing.
    • Experimental demonstration using 2x2 and 4x1 arrays at 4.2 m transmission distance.

    Main Results:

    • Achieved beam steering by controlling laser signal phases.
    • Demonstrated intensity increase by N^2 and beam width reduction by ~N^-1.
    • Generated beam profiles using 2x2 and 4x1 arrays.
    • Recorded spectra from 70 GHz to 1.1 THz.

    Conclusions:

    • Free-space coherent THz photomixer arrays offer significant improvements over single sources and on-chip arrays.
    • These array architectures enhance THz power distribution for stand-off spectroscopy and imaging.
    • The systems provide a large bandwidth and precise beam control for advanced THz applications.