Conference Publication Details
Mandatory Fields
Botello, GS;Abdalmalak, KA;Schlecht, MT;Gonzalez-Ovejero, D;Sedlmeir, F;Schwefel, HGL;Malzer, S;Weber, H;Segovia-Vargas, D;McCarthy, D;Murphy, JA;Dohler, GH;Munoz, LEG
2017 11TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
Analytical Study of Free-Space Coupling of THz Radiation for a New Radioastronomy Receiver Concept
2017
January
Published
1
0 ()
Optional Fields
836
840
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 free-space 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.
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