| Autor: |
de Graaf, S. E., Danilov, A. V., Adamyan, A., Kubatkin, S. E. |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Rev. Sci. Instrum. 84, 023706 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/1.4792381 |
| Popis: |
We report on the design and performance of a cryogenic (300 mK) near-field scanning microwave microscope. It uses a microwave resonator as the near-field sensor, operating at a frequency of 6 GHz and microwave probing amplitudes down to 100 uV, approaching low enough photon population (N~1000) of the resonator such that coherent quantum manipulation becomes feasible. The resonator is made out of a miniaturized distributed fractal superconducting circuit that is integrated with the probing tip, micromachined to be compact enough such that it can be mounted directly on a quartz tuning-fork, and used for parallel operation as an atomic force microscope (AFM). The resonator is magnetically coupled to a transmission line for readout, and to achieve enhanced sensitivity we employ a Pound-Drever-Hall measurement scheme to lock to the resonance frequency. We achieve a well localized near-field around the tip such that the microwave resolution is comparable to the AFM resolution, and a capacitive sensitivity down to 6.4x10^-20 F/rtHz, limited by mechanical noise. We believe that the results presented here are a significant step towards probing quantum systems at the nanoscale using near-field scanning microwave microscopy. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
