Journal article

Position and mode dependent optical detection back-action in cantilever beam resonators

T Larsen, S Schmid, S Dohn, JE Sader, A Boisen, LG Villanueva

Journal of Micromechanics and Microengineering | IOP Publishing | Published : 2017


Optical detection back-action in cantilever resonant or static detection presents a challenge when striving for state-of-the-art performance. The origin and possible routes for minimizing optical back-action have received little attention in literature. Here, we investigate the position and mode dependent optical back-action on cantilever beam resonators. A high power heating laser (100 µW) is scanned across a silicon nitride cantilever while its effect on the first three resonance modes is detected via a low-power readout laser (1 µW) positioned at the cantilever tip. We find that the measured effect of back-action is not only dependent on position but also the shape of the resonance mode. ..

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University of Melbourne Researchers