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Ambient-dependent optomechanical control of cantilever with mechanical nonlinearity by cavity-induced radiation force
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Image of FIG. 1.
FIG. 1.

(a) Model of optical microcavity formed between two thin films of gold. The enhanced electric fields ( , ) exert CIRF on the cantilever; integer subscripts to electric field labels indicate the numbers of layers. Displacing the cantilever from its resonance position generates a restoring force opposing the radiation force. (b) Dependence of the effective mechanical frequency (upper panel) and the reflection (lower panel) on cavity length normalized with respect to the wavelength λ of incident light. (c) CIRF as a periodic function of cavity length with optical rigidity for 1 mW input power, as measured in Ref. 4 . λ is set to 632.8 nm taking as incident light a HeNe laser beam.

Image of FIG. 2.
FIG. 2.

(a) Equilibrium position of the cantilever for various initial positions: from 0.985 to 0.97λ (solid black to dashed aqua line); the black region presents the unstable regime, where the total rigidity is negative. (b) Effective temperature versus input power. High peaks appear when the effective mechanical frequency of the cantilever equals the frequency of non-optical driving force Ω, and low dips correspond to maximum in | | turning the cantilever dynamics to a far off-resonance driven regime, where is much smaller than Ω.

Image of FIG. 3.
FIG. 3.

Input power dependence of for a random driving force with various time steps Δ, Δ/4, and Δ/20 starting from the same initial position indicated by the solid red line in Fig. 2 . for high input powers show an asymptotical trend indicating the stability even under different collision times. The dashed-dotted aqua line presents the equilibrium position scaled along the right-side axis.

Image of FIG. 4.
FIG. 4.

Frequency shift and higher-mode appearance for various time steps. (a) and (b) Mechanical frequency dependence of intensity with slow collisions with Δ and Δ/4, respectively, showing only the frequency shift by increasing CIRF. (c) Mechanical frequency dependence of intensity for the fast collisions with Δ/20, where modes corresponding to 2 clearly appear.


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Table I.

Parameters for thin films.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ambient-dependent optomechanical control of cantilever with mechanical nonlinearity by cavity-induced radiation force