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Detection of nanomechanical motion by evanescent light wave coupling
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic drawing of the device under test. Any relative motion of the waveguide and resonator results in a change in output power , providing a means of monitoring this motion. [(b) and (c)] Scanning electron micrographs of a one dimensional grating coupler (b) and of a typical device consisting of a mechanical resonator and a photonic waveguide (c).

Image of FIG. 2.
FIG. 2.

(Color online) (a) Sketch of the setup. Laser light, , is guided by optical fibers and coupled into the 1D grating on the sample. Transmitted light is collected and fiber guided to a fast optical detector . The electrical signal is amplified (LNA) and read out by the signal-generating NA. (b) Measured resonance vibration spectrum for a beam with dimensions ; the ac voltage was stepwised increased (see inset).

Image of FIG. 3.
FIG. 3.

(Color online) (a) Comparison of the mode solution for gaps of 300 and ; more power is coupled to the mechanical resonator for the smaller gap case . (b) The transmission of power, , as function of in-plane separation and the sensitivity to displacements are shown. (c) The displacement resolution, , as function of .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Detection of nanomechanical motion by evanescent light wave coupling