Reconstructing nonlinearities with intermodulation spectroscopy

Details Reconstructing nonlinearities with intermodulation spectroscopy Reconstructing nonlinearities with intermodulation spectroscopy

2009-11-15

arxiv.org/abs/0911.2826v2

Phys. Rev. Lett. 104, 050801 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.104.050801

We describe a method of analysis which allows for reconstructing the nonlinear disturbance of a high Q harmonic oscillator. When the oscillator is driven with two or more frequencies, the nonlinearity causes intermodulation of the drives, resulting in a complicated spectral response. Analysis of this spectrum allows one to approximate the nonlinearity. The method, which is generally applicable to measurements based on resonant detection, increases the information content of the measurement without requiring large detection bandwidth, and optimally uses the enhanced sensitivity near resonance to extract information and minimize error due to detector noise.

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