Microstructured gradient-index lenses for THz photoconductive antennas

Mads Brincker, Peter Karlsen, Esben Skovsen, Thomas Søndergaard

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    10 Citationer (Scopus)
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    Abstract

    A new type of substrate lens for photoconductive antennas (PCA’s) based on sub-wavelength microstructuring is presented and studied theoretically by the use of Greens function integral equation methods (GFIEM’s). By etching sub-wavelength trenches into a flat substrate, the effective dielectric constant can be designed to function like a gradient index (GRIN) lens. The proposed GRIN substrate lenses have sub-mm dimension, which is smaller than the dimensions of a typical hyper-hemispherical substrate lens (HSL), and could enable fabrication of arrays of closely packed PCA’s with individual lenses integrated directly into the PCA substrate. The performance of different GRIN lenses is compared to a HSL and shown to be comparable with regards to the terahertz radiation extraction efficiency, and it is shown that the collimating properties of these GRIN lenses can be tailored by changing the parameters used for microstructuring.
    OriginalsprogEngelsk
    Artikelnummer025015
    TidsskriftAIP Advances
    Vol/bind6
    Udgave nummer2
    Antal sider6
    ISSN2158-3226
    DOI
    StatusUdgivet - 16 feb. 2016

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