3,062 research outputs found
Phase asymmetry effect in longitudinal offset coupled resonator optical waveguides
We show that the implementation of the longitudinal displacement technique
for adjusting the coupling coefficients in microring waveguides is subject to a
phase asymmetry effect. This issue is shown to substantially alter the system
response in apodized filters and cannot be ignored in the design stage
Density operator of a system pumped with polaritons: A Jaynes-Cummings like approach
We investigate the effects of considering two different incoherent pumpings
over a microcavity-quantum dot system modelled using the Jaynes-Cummings
Hamiltonian. When the system is incoherently pumped with polaritons it is able
to sustain a large number of photons inside the cavity with Poisson-like
statistics in the stationary limit, and also leads to a separable
exciton-photon state. We also investigate the effects of both types of pumpings
(Excitonic and Polaritonic) in the emission spectrum of the cavity. We show
that the polaritonic pumping as considered here is unable to modify the
dynamical regimes of the system as the excitonics pumping does. Finally, we
obtain a closed form expression for the negativity of the density matrices that
the quantum master equation considered here generates.Comment: 16 pages, 4 figure
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La efectiva tutela jurisdiccional de las situaciones jurídicas materiales: hacia una necesaria reinvindicación de los fines del proceso
Spatiotemporal dispersion and wave envelopes with relativistic and pseudorelativistic characteristics
A generic nonparaxial model for pulse envelopes is presented. Classic Schro¨dinger-type descriptions of
wave propagation have their origins in slowly-varying envelopes combined with a Galilean boost to the
local time frame. By abandoning these two simplifications, a picture of pulse evolution emerges in which
frame-of-reference considerations and space-time transformations take center stage. A wide range of
effects, analogous to those in special relativity, then follows for both linear and nonlinear systems. Explicit
demonstration is presented through exact bright and dark soliton pulse solutions
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