Optomechanical transduction is demonstrated for nanoscale torsional resonators evanescently coupled to optical microdisk whispering gallery mode resonators. The on-chip, integrated devices are measured using a fully fiber-based system, including a tapered and dimpled optical fiber probe. With a thermomechanically calibrated optomechanical noise floor down to 7 fm/sqrt(Hz), these devices open the door for a wide range of physical measurements involving extremely small torques, as little as 4x10^-20 N*m.
@article{arxiv.1210.1852,
title = {Nanoscale Torsional Optomechanics},
author = {P. H. Kim and C. Doolin and B. D. Hauer and A. J. R. MacDonald and M. R. Freeman and P. E. Barclay and J. P. Davis},
journal= {arXiv preprint arXiv:1210.1852},
year = {2013}
}
Comments
4 pages, 4 figures - Accepted to APL Oct 22nd, 2012. To appear in February 4th issue - as cover article