Wide Stiffness Range Cavity Optomechanical Sensors for Atomic Force Microscopy

Abstract

We report on progress in developing compact sensors for atomic force microscopy (AFM), in which the mechanical transducer is integrated with near-field optical readout on a single chip. The motion of a nanoscale, doubly-clamped cantilever was transduced by an adjacent high quality factor silicon microdisk cavity. In particular, we show that displacement sensitivity on the order of 1 fm/(Hz)^(1/2) can be achieved while the cantilever stiffness is varied over four orders of magnitude (\approx 0.01 N/m to \approx 290 N/m). The ability to transduce both very soft and very stiff cantilevers extends the domain of applicability of this technique, potentially ranging from interrogation of microbiological samples (soft cantilevers) to imaging with high resolution (stiff cantilevers). Along with mechanical frequencies (> 250 kHz) that are much higher than those used in conventional AFM probes of similar stiffness, these results suggest that our cavity optomechanical sensors may have application in a wide variety of high-bandwidth AFM measurements.

References in corpus (7)

• Laser cooling of a nanomechanical oscillator into its quantum ground state
• Cavity Optomechanics
• Optomechanical transduction of an integrated silicon cantilever probe using a microdisk resonator
• Optical-fiber based measurement of an ultra-small volume high-Q photonic crystal microcavity
• An optical fiber-taper probe for wafer-scale microphotonic device characterization
• Electrostatic actuation of silicon optomechanical resonators
• Crossover from Hydrodynamics to the Kinetic Regime in Confined Nanoflows

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