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Experimental Investigation of a Superconducting Switch at Millimeter Wavelengths

Boon Kok Tan ; Ghassan Yassin ; Ernst Otto (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Leonid Kuzmin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
IEEE Xplore: IEEE Transactions on Terahertz Science and Technology (2156-342X). Vol. 6 (2016), 1, p. 121-126.
[Artikel, refereegranskad vetenskaplig]

We present preliminary measured responses of a planar superconducting on/off switch operating at millimeter wavelengths. The superconducting switch, comprising three niobium nitride (NbN) bridges, is deposited across the slotline section of a back-to-back unilateral finline. The transmission characteristics of the superconducting switch illuminated by a millimeter source was measured using a superconductor-insulator-superconductor (SIS) tunnel junction as direct detector. The NbN bridges were switched from the superconducting state to the normal state by passing current through the bridges with magnitude that exceeds its critical current value. With this arrangement, we have measured a typical switching dynamic range of approximately 10 dB across the 205-240 GHz band, with the highest dynamic range of ?20 dB at 230 GHz. This demonstrated the successful operation of the multiple NbN bridges as a planar superconducting on/off switch.

Nyckelord: Millimeter astronomy; millimeter wave devices; millimeter-wave technology; modulators; terahertz (THz) switch

Denna post skapades 2016-07-12. Senast ändrad 2016-10-07.
CPL Pubid: 239285


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