Ultrafast Voltage Sampling using Single-Electron Wavepackets

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Ultrafast Voltage Sampling using Single-Electron Wavepackets

Johnson, N; Fletcher, JD; Humphreys, DA; See, P; Griffiths, JP; Jones, GAC; Farrer, I; ... Kataoka, M; + view all (2017) Ultrafast Voltage Sampling using Single-Electron Wavepackets. Applied Physics Letters , 110 (10) , Article 102105. 10.1063/1.4978388. Green open access

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Abstract

We demonstrate an ultrafast voltage sampling technique using a stream of electron wavepackets. Electrons are emitted from a single-electron pump and travel through electron waveguides towards a detector potential barrier. Our electrons sample an instantaneous voltage on the gate upon arrival at the detector barrier. Fast sampling is achieved by minimising the duration that the electrons interact with the barrier, which can be made as small as a few picoseconds. The value of the instantaneous voltage can be determined by varying the gate voltage to match the barrier height to the electron energy, which is used as a stable reference. The test waveform can be reconstructed by shifting the electron arrival time against it. Although we find that the our current system is limited by the experimental line bandwidth to 12–18 GHz, we argue that this method has scope to increase the bandwidth of voltage sampling to 100 GHz and beyond.

Type:	Article
Title:	Ultrafast Voltage Sampling using Single-Electron Wavepackets
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1063/1.4978388
Publisher version:	http://dx.doi.org/10.1063/1.4978388
Language:	English
Additional information:	The following article appeared in Applied Physics Letters [Johnson, N; Fletcher, JD; Humphreys, DA; See, P; Griffiths, JP; Jones, GAC; Farrer, I; (2017) Ultrafast Voltage Sampling using Single-Electron Wavepackets. Applied Physics Letters, 110 (10), Article 102105. 10.1063/1.4978388] and may be found at http://dx.doi.org/10.1063/1.4978388.
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI:	https://discovery.ucl.ac.uk/id/eprint/1545154