2,317 research outputs found
Frequency up-converted radiation from a cavity moving in vacuum
We calculate the photon emission of a high finesse cavity moving in vacuum.
The cavity is treated as an open system. The field initially in the vacuum
state accumulates a dephasing depending on the mirrors motion when bouncing
back and forth inside the cavity. The dephasing is not linearized in our
calculation, so that qualitatively new effects like pulse shaping in the time
domain and frequency up-conversion in the spectrum are found. Furthermore we
predict the existence of a threshold above which the system should show
self-sustained oscillations.Comment: 10 pages, 3 figures, LaTeX, to appear in European Physical Journal
D3, replaced version with few minor grammatical change
Quantum limits in interferometric measurements
Quantum noise limits the sensitivity of interferometric measurements. It is
generally admitted that it leads to an ultimate sensitivity, the ``standard
quantum limit''. Using a semi-classical analysis of quantum noise, we show that
a judicious use of squeezed states allows one in principle to push the
sensitivity beyond this limit. This general method could be applied to large
scale interferometers designed for gravitational wave detection.Comment: 4 page
Generating photon pulses with an oscillating cavity
We study the generation of photon pulses from thermal field fluctuations
through opto-mechanical coupling to a cavity with an oscillatory motion. Pulses
are regularly spaced and become sharp for a high finesse cavity.Comment: 6 pages, 3 figures, LaTeX, needs EuroPhysics Letters Stylefile, to
appear in Europhysics Letter
Casimir torque between nanostructured plates
We investigate in detail the Casimir torque induced by quantum vacuum
fluctuations between two nanostructured plates. Our calculations are based on
the scattering approach and take into account the coupling between different
modes induced by the shape of the surface which are neglected in any sort of
proximity approximation or effective medium approach. We then present an
experimental setup aiming at measuring this torque.Comment: 7 pages, 7 figure
Development of a high sensitivity torsional balance for the study of the Casimir force in the 1-10 micrometer range
We discuss a proposal to measure the Casimir force in the parallel plate
configuration in the m range via a high-sensitivity torsional balance.
This will allow to measure the thermal contribution to the Casimir force
therefore discriminating between the various approaches discussed so far. The
accurate control of the Casimir force in this range of distances is also
required to improve the limits to the existence of non-Newtonian forces in the
micrometer range predicted by unification models of fundamental interactions.Comment: 10 pages, 2 figure
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