[Cnqo] Tomorrow Seminar 3PM SUPA room

[Andrew Kelly]

Dear All,

Tomorrow we will have a seminar by Arnaud Gloppe from the Institut Neél, CNRS on the subject of his PhD work.  I apologise for the late notice.  Details below

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Speaker: Arnaud Gloppe, CNRS
Date: Thursday, 21st August
Time: 3pm
Location: JA8.13 - SUPA Room
Title: Bidimensional nano-optomechanics and topological backaction in a non-conservative radiation force field
Abstract: Optomechanics, which explores the fundamental coupling between light and mechanical motion, has made important advances in both exploring and manipulating macroscopic mechanical oscillators down to the quantum level. However, dynamical effects related to the vectorial nature of the optomechanical interaction remain to be investigated. Here we study a Silicon Carbide nanowire with sub-wavelength dimensions strongly coupled to a tightly focused beam of light, enabling ultrasensitive readout of the nanoresonator dynamics. We experimentally determine the vectorial structure of the optomechanical interaction and demonstrate that bidimensional dynamical backaction governs the nanowire dynamics. Moreover, the non-conservative topology of the optomechanical interaction is responsible for a novel canonical signature of strong coupling between the nanoresonator mechanical modes, leading to a topological instability. These results have a universal character and illustrate the increased sensitivity of nanomechanical devices towards topologically varying interactions, opening fundamental perspectives in nanomechanics, optomechanics, ultrasensitive scanning probe force microscopy and nano-optics. In this regard, we have started exploring the dissipative regime of the nano-optomechanical interaction and shown that it enables Brownian motion control at the nanoscale, with no optical cavity being required.

A. Gloppe et al., arXiv:1401.6829 (2014)


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