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VERSION
 :2.0
PRODID
 :-//Simian Systems//NONSGML Sitellite Application Framework//EN
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SUMMARY
 :Cooling Polarisable Particles with an Optical Memor
DESCRIPTION
 :Most optical cooling methods|optical molasses being the prototypical
 example here|have tra-
ditionally relied on the resonant enhancement
 of forces originating in the Doppler shift. Systems,
such as simple
 mirrors, that demonstrate no such resonance cannot be cooled as
 easily.
Several approaches to solve this problem involve the use of
 cavities. Our approach is to look at
a cavity interacting with an
 optomechanical system as an optical memory, which introduces
 a
non-Markovian, or time-delayed, component in the forces acting on
 the system.
We first look at what we call 'mirror mediated cooling',
 where a point polarisable particle (an
atom, say, or a micromirror)
 interacts with its time-delayed re
ection in a mirror and
 thereby
experiences a cooling force the memory here consists of a
 long time delay between the particle
and the mirror. Such a long
 delay line is not experimentally desirable, and we can
 signicantly
improve the system by replacing it with another
 well-known memory element: a Fabry(Perot
cavity. This 'external
 cavity cooling' scheme is dierent from standard cavity mediated
 cooling
techniques in that the particle sits outside the cavity. We
 analyse this new system using a simple,
but surprisingly useful,
 model grounded in classical electrodynamics and show that, even with
 the
particle outside the cavity, the force acting on it is amplied
 by a factor of the order of the cavity
nesse.
Possible realisations
 of this scheme range from relatively simple modications to existing
 op-
tomechanical experiments, essentially adding a second xed
 mirror, to the use of more exotic
structures possessing strong
 plasmon resonances to generate the required optical delay.
LOCATION
 :Erwin-Schrödinger-Saal, IQOQI
DTSTART
 :20100708T101500
TZID
 :Europe/Vienna
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