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Near threshold all-optical backaction amplifier
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the experiment. NA sweep: modulation signal swept across a mechanical resonance; : modulation frequency optical linewidth; : modulation frequency optical linewidth; AM: amplitude modulator; Attn: optical attenuator; NA: network analyser; SA: spectrum analyser, CRO: oscilloscope. (b) SEM image of a microtoroid. (c) SEM image of a microtoroid cut to show the microtoroid rim relative to the plane of the disk, where the rim has a typical diameter of 5 m. (d) Exaggerated schematic of microtoroid vibration used to model the mechanical motion (supplementary information) where R is the radius of the microtoroid and x is the change in radius due to the radiation pressure .

Image of FIG. 2.
FIG. 2.

Backaction amplification as a function of frequency for various pump powers. Network analyzer bandwidth: 300 Hz, sweep time: 5 s. Black traces: experimental results. Red (grey) lines: model. Incident power in W: (a) 3.0, (b) 5.4, (c) 7.2, (d) 9.0, (e) 10.2, (f) 12.0. (g) and (h) Experimental data and model for 18 power levels. Model parameters: Q0  = , Qm  = 480, optical detuning MHz, input coupling rate MHz, strength of Kerr nonlinearity MHz.

Image of FIG. 3.
FIG. 3.

a) Maximum amplification as function of input power. Crosses: experimental measurements with high input depth of modulation. Solid and hollow circles: near threshold measurements, respectively, with and without, a 24 dB reduction in input depth of modulation. Red (grey) line: model with identical parameters to those in Fig. 2. Vertical line: threshold. (b) Backaction attenuation. Black trace: experiment. Red (grey) line: model with input power of 7 W, Q 0 = , MH, MHz, other parameters same as in Fig. 2.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Near threshold all-optical backaction amplifier