3,504 research outputs found
Photonic currents in driven and dissipative resonator lattices
Arrays of coupled photonic cavities driven by external lasers represent a
highly controllable setup to explore photonic transport. In this paper we
address (quasi)-steady states of this system that exhibit photonic currents
introduced by engineering driving and dissipation. We investigate two
approaches: in the first one, photonic currents arise as a consequence of a
phase difference of applied lasers and in the second one, photons are injected
locally and currents develop as they redistribute over the lattice. Effects of
interactions are taken into account within a mean-field framework. In the first
approach, we find that the current exhibits a resonant behavior with respect to
the driving frequency. Weak interactions shift the resonant frequency toward
higher values, while in the strongly interacting regime in our mean-field
treatment the effect stems from multiphotonic resonances of a single driven
cavity. For the second approach, we show that the overall lattice current can
be controlled by incorporating few cavities with stronger dissipation rates
into the system. These cavities serve as sinks for photonic currents and their
effect is maximal at the onset of quantum Zeno dynamics.Comment: 12 pages, 11 figure
Assessment of Thematic Mapper band-to-band registration by the block correlation method
Rectangular blocks of pixels from one band image were statistically correlated against blocks centered on identical pixels from a second band image. The block pairs were shifted in pixel increments both vertically and horizontally with respect to each other and the correlation coefficient to the maximum correlation was taken as the best estimate of registration error for each block pair. For the band combinations of the Arkansas scene studied, the misregistration of TM spectral bands within the noncooled focal plane lie well within the 0.2 pixel target specification. Misregistration between the middle IR bands is well within this specification also. The thermal IR band has an apparent misregistration with TM band 7 of approximately 3 pixels in each direction. The TM band 3 has a misregistration of approximately 0.2 pixel in the across-scan direction and 0.5 pixel in the along-scan direction, with both TM bands 5 and 7
Twin polaritons in semiconductor microcavities
The quantum correlations between the beams generated by polariton pair
scattering in a semiconductor microcavity above the parametric oscillation
threshold are computed analytically. The influence of various parameters like
the cavity-exciton detuning, the intensity mismatch between the signal and
idler beams and the amount of spurious noise is analyzed. We show that very
strong quantum correlations between the signal and idler polaritons can be
achieved. The quantum effects on the outgoing light fields are strongly reduced
due to the large mismatch in the coupling of the signal and idler polaritons to
the external photons
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