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- W1615655887 abstract "A reduction in the mixer noise is expected when using superconductors with a lower transition temperature (Tc) since the thermal noise components of the mixer noise should scale with Tc. Also, the local oscillator (LO) power required for a diffusion-cooled device should decrease as Tc when Tbath<<Tc. We previously studied mixing in aluminum based hot-electron bolometers (HEBs) at microwave frequencies (~30 GHz), and observed a significant improvement in noise performance, and a reduction in LO power as predicted. However, the bias voltage range over which good mixer performance was observed was ~ 5-10 μV. These devices are thus susceptible to saturation effects, in particular output saturation. In the present work, we have investigated Nb HEBs whose Tc is lowered by applying a magnetic field. The goal is to study a case intermediate between Nb and Al, and hopefully to find properties that will allow use in practical receivers. A 15 kOe perpendicular magnetic field was applied to a Nb HEB (L=0.16 μm, W=0.08 μm, RN=90Ω) to reduce Tc from 5.2 K to 2.4 K. The mixer noise, as inferred from the output noise and the conversion efficiency, decreased from 390 K, DSB to 171 K, DSB. The LO power required for near optimum mixer conversion efficiency (ηmixer = 9 dB in this device) was 8nW in zero field, and ~ 2 nW when Tc was reduced to 2.4K. Tbath=0.22K. The conversion bandwidth was previously measured to be 2.4 GHz and the same bandwidth was observed in the presence of a magnetic field. By lowering Tc, the voltage range over which good mixing was observed also decreased. However, even with Tc reduced to 2.4 K, the conversion efficiency dropped by 3dB from its maximum value only when the bias voltage was changed by ~ 90 μV. Saturation effects should thus be much less of a concern in these devices than in Al HEBs. In situations where the application of a large magnetic field is not feasible, we suggest using Ta based HEBs. Ta HEBs should have Tc ~ 3-3.5K and material properties very similar to Nb." @default.
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- W1615655887 date "2001-02-14" @default.
- W1615655887 modified "2023-09-24" @default.
- W1615655887 title "Reduced Tc Niobium superconducting HEB mixers" @default.
- W1615655887 hasPublicationYear "2001" @default.
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