Superconducting quantum detectors: publications

Single-Ended Mixer Tests

Chapter in Development of Coherent Detector Technologies for Sub-Millimetre Wave Astronomy Observations, Springer Nature (2016) 77-96

The Characteristics of an SIS Junction Near Its Superconducting Gap

Chapter in Development of Coherent Detector Technologies for Sub-Millimetre Wave Astronomy Observations, Springer Nature (2016) 137-146

Experimental Investigation of a Superconducting Switch at Millimetre Wavelength

IEEE Transactions on Terahertz Science & Technology Institute of Electrical and Electronics Engineers (IEEE) (2015)

Authors:

BK Tan, G Yassin, E Otto, L Kuzmin

A Compact Microstrip-fed Planar Dual-Dipole Antenna for Broadband Applications

IEEE Antennas and Wireless Propagation Letters Institute of Electrical and Electronics Engineers (IEEE) (2015)

Authors:

BK Tan, S Withington, G Yassin

A 220 GHz finline mixer with ultra-wide instantaneous bandwidth

Proceedings of the International Symposium on Space Terahertz Technology IEEE (2015)

Authors:

Boon Tan, Faouzi Boussaha, Christine Chaumont, Ghassan Yassin

Abstract:

We describe the design and fabrication of a 220 GHz superconductor-insulator-superconductor (SIS) mixer with ultrawide IF bandwidth. The mixer is fabricated on a 100 µm thick quartz substrate, with planar circuit on-chip integration. The RF power is coupled to the tunnel junction via a unilateral finline taper and a slotline-to-microstrip transition. We used a double-stub tuning network to tune out the junction’s parasitic capacitance at a broad RF bandwidth, and matched the output impedance of the mixer to the input impedance of the IF amplifier (50 Ω) from 4–18 GHz using a 6-stage IF impedance-transformer. We have fabricated these devices and have measured good DC current-voltage (IV) characteristic curves. The heterodyne mixing performance of these devices is currently being measured, and we expect to present the results in the forthcoming ISSTT conference in March.

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