7,631 research outputs found
Signature of strong atom-cavity interaction on critical coupling
We study a critically coupled cavity doped with resonant atoms with
metamaterial slabs as mirrors. We show how resonant atom-cavity interaction can
lead to a splitting of the critical coupling dip. The results are explained in
terms of the frequency and lifetime splitting of the coupled system.Comment: 8 pages, 5 figure
Two photon quantum interference in plasmonics - Theory and Applications
We report perfect two photon quantum interference with near-unity visibility
in a resonant tunneling plasmonic structure in folded Kretschmann geometry.
This is despite absorption-induced loss of unitarity in plasmonic systems. The
effect is traced to perfect destructive interference between the squares of
amplitude reflection and transmission coefficients. We further highlight yet
another remarkable potential of coincidence measurements as a probe with better
resolution as compared to standard spectroscopic techniques. The finer features
show up in both angle resolved and frequency resolved studies.Comment: 5 pages, 6 figure
Giant Radiative Interactions Among Distant Atoms
We examine the feasibility of enhancing the fundamental radiative
interactions between distant atoms. We present general arguments for producing
enhancement. In particular, we show how giant dipole-dipole interaction can be
produced by considering dipoles placed close to micron sized silica spheres.
The giant interaction arises as the whispering gallery modes can resonantly
couple the dipoles.Comment: 4 figures included in the postscript file, to appear in "Current
trens in Atomic and Molecular Physics", edited by R. Srivastava (Phoenix
publishing House, New Delhi, India, 2001
Gap solitons with null-scattering
We study excitation of gap solitons under the conditions of coherent perfect
absorption (CPA). Our system consists of a symmetric periodic structure with
alternating Kerr nonlinear and linear layers, illuminated from both the ends.
We show near-total transfer of incident light energy into the gap solitons
resulting in null-scattering. We also report on the nonlinear super-scattering
(SS) states. Both the CPA and the SS states are shown to be characterized by
typical field distributions. Both the exact and the approximate results (based
on nonlinear characteristic matrix method) are presented, which show good
agreement
Cavity controlled spectral singularity
We study theoretically a PT-symmetric saturable balanced gain-loss system in
a ring cavity configuration. The saturable gain and loss are modeled by
two-level medium with or without population inversion. We show that the
specifics of the spectral singularity can be fully controlled by the cavity and
the atomic detuning parameters. The theory is based on the mean-field
approximation as in standard theory of optical bistability. Further, in the
linear regime we demonstrate the regularization of the singularity in detuned
systems, while larger input power levels are shown to be adequate to limit the
infinite growth in absence of detunin
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