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<p class="MsoNormal"><span style="font-size:11.0pt">Dear All, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">********************************************************************************<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Speaker:</span></b><span style="font-size:11.0pt"> </span><span style="font-size:11.0pt">Arnaud Gloppe</span><span style="font-size:11.0pt">, CNRS<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Date:</span></b><span style="font-size:11.0pt"> Thursday, 21st August<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Time:</span></b><span style="font-size:11.0pt"> 3pm
<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Location:</span></b><span style="font-size:11.0pt"> JA8.13 - SUPA Room<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Title:</span></b><span style="font-size:11.0pt"> </span><b><span style="font-size:11.0pt">Bidimensional nano-optomechanics and topological backaction in a non-conservative radiation force field</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Abstract:</span></b><span style="font-size:11.0pt"> 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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><br>
A. Gloppe et al., arXiv:1401.6829 (2014)</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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