Analytical study of free-space coupling of THz radiation for a new radioastronomy receiver concept
Abstract
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.
Additional Information
© 2017 IEEE. This work has been financially supported by "DiDaCTIC: Desarrollo de un sistema de comunicaciones inalambrico en rango THz integrado de alta tasa de datos", TEC2013-47753-C3, CAM S2013/ICE-3004 "DIFRAGEOS" projects, "Proyecto realizado con la Ayuda Fundacíon BBVA a Investigadores y Creadores Culturales 2016." and "Estancias de movilidad de profesores PRX16/00021".Additional details
- Eprint ID
- 77740
- Resolver ID
- CaltechAUTHORS:20170524-163351689
- Created
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2017-05-25Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field