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Tuneable electromechanical comb generation
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10.1063/1.3694041
/content/aip/journal/apl/100/11/10.1063/1.3694041
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/11/10.1063/1.3694041
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) A false colour electron micrograph of the electromechanical resonator. The piezoelectric effect between the top-gate and the 2 dimensional electron gas transduces the mechanical motion. Via the top-gate, the electromechanical resonator is harmonically excited with the signal and the activation of the pumps induces a non-linear variation of the mechanical tension which enables the signal and pump phonons to mix resulting in array of equally spaced oscillations. (b) A schematic profile of the measurement where the signal is applied to first mode, the 2 pumps are activated close to the sum frequency of the fundamental and first mode which results in the creation of an idler array in the fundamental mode. (c) The response of the fundamental and the first mode when harmonically excited with an actuation amplitude of 50 V rms and 5 mV rms , respectively.

Image of FIG. 2.
FIG. 2.

(Color online) (a) The electromechanical comb generated in the bandwidth of the fundamental mode with a signal and pump amplitude of 25 and 600 mV rms , respectively, for  = 0.1–1.0 Hz and a measurement RBW of 25 mHz. The amplitude scale is identical for all spectra and is defined in the lowest panel. The top panel shows the calculated bandwidth and lineshape of the fundamental mode which reveals the comb’s spectral profile is identical thus confirming its electromechanical origin. (b) The same as (a) except is varied over 3 orders of magnitude from 5, 0.5, 0.05, and 0.005 Hz with a corresponding measurement RBW of 25 mHz, 25 mHz, 1.6 mHz, and 0.3 mHz, respectively. Also note as increases, the comb’s teeth density and intensity reduces.

Image of FIG. 3.
FIG. 3.

(Color online) The electromechanical comb generated in the bandwidth of the fundamental mode for a range of pump amplitudes with a signal amplitude of 20 mV rms ,  = 0.1 Hz and a measurement RBW of 6.3 mHz. The amplitude scale is identical for all spectra and is defined in the lowest panel. (b) The same as (a) except now the signal amplitude is varied and the pump amplitude is fixed at 400 mV rms . These measurements reveal that teeth density in the comb can be dynamically controlled via the pump (and to a lesser degree the signal) amplitude.

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/content/aip/journal/apl/100/11/10.1063/1.3694041
2012-03-15
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuneable electromechanical comb generation
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/11/10.1063/1.3694041
10.1063/1.3694041
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