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Single-crystalline Bi2Sr2CaCu2O8+x detectors for direct detection of microwave radiation

Mengyue Li (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Dag Winkler (Institutionen för mikroteknologi och nanovetenskap) ; Avgust Yurgens (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Applied Physics Letters (0003-6951). Vol. 106 (2015), 15,
[Artikel, refereegranskad vetenskaplig]

We test radiation detectors made from single-crystalline Bi2Sr2CaCu2O8+x flakes put on oxidized Si substrates. The 100-nm-thick flakes are lithographically patterned into 4 x 12 mu m(2) large rectangles embedded in thin-film log-spiral antennas. The SiO2 layer weakens the thermal link between the flakes and the bath. Two modes of radiation detection have been observed. For a bolometric type of sensors a responsivity of similar to 300 V/W and a noise equivalent power of 30 nW/root Hz has been deduced at 70 K. Much more sensitive is the non-bolometric device showing characteristics similar to a Golay-type detector while being at least a thousand times faster. Making smaller (sub-mu m) structures is expected to significantly improve the performance of these devices and makes them very competitive among other microwave and terahertz detectors.



Denna post skapades 2015-06-04. Senast ändrad 2015-06-23.
CPL Pubid: 218032

 

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