on 30-05-2014
Pedro Gomes, University of Strathclyde
30/05/2014, 16:15.
Room P3.10, Mathematics Building, IST.
Optomechanics has attracted a lot of interest recently due to the combined control of light and mechanical modes. Spontaneous optomechanical self-organization was observed in a variety of non-linear systems such as atomic ensembles in a cavity [1]. We are looking in a single mirror scheme where a single pump beam and a mirror placed after the atomic cloud induce spontaneous self-organization observed on a plane transverse to the beam propagation. Previous investigations that showed continuous symmetry breaking on both translation and rotation relied on spatial modulation on the internal states of the atoms. Recently it was predicted that dipole forces alone could induce the same kind of transverse self-organization based on the atomic density without an intrinsic optical non-linearity [2]. We report on the observation of spontaneous self-structuring in cold atoms released from a magneto-optical trap [3]. Two mechanisms come into play in this experiment: the already known internal states non-linearity and the new optomechanical non-linearity. We identify regimes where each mechanism is dominant as well as the mixed case by comparing the structures in both the pump and in a probe beam sent a few tens of microseconds after pump extinction. In the optomechanical dominant regime, we observe in the probe the dynamical growth and decay of atomic structures in the order of magnitude comparable to the atomic motion at ultracold atoms temperatures.
References
[1] H. Ritsch et al. Rev. Mod. Phys. 85, 553–601 (2013)
[2] E. Tesio et al. Phys. Rev. A 86 031801(R) (2012)
[3] G. Labeyrie et al. Nature Photon. 8 321–325 (2014
Quantum Computation and Information Seminar
http://math.ist.utl.pt/seminars/qci/?action=next
Support: Phys-Info (IT), SQIG (IT), CFIF and CAMGSD, with support from FCT, FEDER and EU FP7, namely via projects PEst-OE/EEI/LA0008/2013, Landauer (GA 318287) and PAPETS (323901).
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on 26-05-2014
Research in Applications of Optics and Photonics is continuously evolving with remarkable and exciting recent developments in a variety of fields, all over the world. After the success of the first edition in 2011, the AOP2014 will be held at Aveiro on May 26 to 30, 2014.
We are looking forward to welcome the optics and photonics community and our friends from all over the world, for an exciting and most pleasant week. Open to contributions in all topics of Optics and Photonics and application’ fields, with this conference we expect to set the state-of-the-art in the subject foreseeing the lines of development on next decade.
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