An antenna-coupled bolometer with an integrated microstrip bandpass filter

Myers, Michael J.; Holzapfel, William; Lee, Adrian T.; O'Brient, Roger; Richards, P. L.; Tran, Huan T.; Ade, Peter; Engargiola, Greg; Smith, Andy; Spieler, Helmuth
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p114103
Academic Journal
We describe the fabrication and testing of antenna-coupled superconducting transition-edge bolometers for use at millimeter wavelengths. The design uses a double-slot dipole antenna connected to superconducting niobium microstrip. Band defining filters are implemented in the microstrip, which is then terminated with a load resistor. The power dissipated in the load resistor is measured by a superconducting transition-edge sensor (TES). The load resistor and TES are thermally well connected and are supported by a silicon nitride substrate. The substrate is suspended by four narrow silicon nitride legs for thermal isolation. The bolometers have been optically characterized and the spectral response is presented. This detector is a prototype element for use in an array designed for studies of the cosmic microwave background polarization.


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