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    Analytical study of free-space coupling of THz radiation for a new radioastronomy receiver concept

    Santamaría Botello, Gabriel and Abdalmalak, Kerlos Atia and Schlecht, Maria-Theresa and González-Ovejero, David and Sedlmeir, Florian and Schwefel, Harald G.L. and Malzer, Stefan and Weber, Heiko and Segovia-Vargas, Daniel and Murphy, J.Anthony and Döhler, Gottfried H. and García Muñoz, Luis-Enrique (2017) Analytical study of free-space coupling of THz radiation for a new radioastronomy receiver concept. In: 2017 11th European Conference on Antennas and Propagation (EUCAP). IEEE, pp. 836-840. ISBN 978-8-8907-0187-0

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    In this paper, a scheme for coupling free-space THz radiation into a nonlinear whispering-gallery mode (WGM) resonator is presented. The purpose is to detect the weak THz radiation from the cosmic microwave background (CMB) by up-converting the signal into the optical domain via the nonlinearity of the medium. Such high-sensitivity receiver has theoretically shown capabilities towards photon counting at room temperature, however, it is critical to efficiently couple the THz radiation into the resonator. Therefore, by using the Schelkunoff-Waterman method (the so called T-matrix method) we perform an analytical evaluation of two different free-space coupling techniques: a frees-pace Gaussian beam, and a Gaussian beam incident in a silicon lens under total internal reflection. By comparing the excited modes in the resonator, the optimal parameters for each case are given.

    Item Type: Book Section
    Additional Information: This paper was presented at The 11th European Conference on Antennas and Propagation, Paris, France, on 19-24 March 2017.
    Keywords: Optical resonators; Manganese; Couplings; Optical receivers; Nonlinear optics; Optical pumping; Optical surface waves; matrix algebra; radioastronomy; radiofrequency cosmic radiation; terahertz waves; whispering gallery modes; free-space coupling techniques; THz radiation; radioastronomy receiver concept; nonlinear whispering-gallery mode resonator; WGM resonator; cosmic microwave background; CMB; optical domain; high-sensitivity receiver; photon counting; Schelkunoff-Waterman method; T-matrix method; analytical evaluation; frees-pace Gaussian beam; Gaussian beam incident; silicon lens; total internal reflection; temperature 293 K to 298 K; Cosmic microwave background; THz; photon-counting; whispering-galley mode; T-matrix;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 12016
    Identification Number:
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 12 Dec 2019 15:11
    Publisher: IEEE
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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