Conference Publication Details
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Botello G.;Abdalmalak K.;Schlecht M.;Gonzalez-Ovejero D.;Sedlmeir F.;Schwefel H.;Malzer S.;Weber H.;Segovia-Vargas D.;McCarthy D.;Murphy J.;Dohler G.;Munoz L.
2017 11th European Conference on Antennas and Propagation, EUCAP 2017
Analytical study of free-space coupling of THz radiation for a new radioastronomy receiver concept
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Cosmic microwave background photon-counting T-matrix THz whispering-galley mode
© 2017 Euraap. 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 freespace 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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