1,160 research outputs found
Waveguiding without a waveguide: Local‐mode exciton polaritons in multiple quantum wells
Exciton polaritons are considered in infinite multiple quantum wells which are periodic except that one well (impurity) has a different well width from the others (host). Under certain circumstances it is possible to have a long‐lived exciton‐polariton mode localized about the impurity. From the viewpoint of the electromagnetic field, this corresponds to waveguide modes in the vicinity of an exciton resonance in such structures. © 1995 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/71327/2/APPLAB-66-8-994-1.pd
Selective spin coupling through a single exciton
We present a novel scheme for performing a conditional phase gate between two
spin qubits in adjacent semiconductor quantum dots through delocalized single
exciton states, formed through the inter-dot Foerster interaction. We consider
two resonant quantum dots, each containing a single excess conduction band
electron whose spin embodies the qubit. We demonstrate that both the two-qubit
gate, and arbitrary single-qubit rotations, may be realized to a high fidelity
with current semiconductor and laser technology.Comment: 5 pages, 3 figures; published version, equation formatting improved,
references adde
3D Quantitative Damage Characterization in the Coating of a Metal Substrate with Terahertz Waves
In this study, terahertz (THz) reflective imaging is applied to characterize damage in the coating on metal substrates. The coating was initially scratched, and after aging, different damage mechanisms have occurred. Since the coating is optically thin (compared to the wavelengths within the THz spectrum), the THz echoes will partially or totally overlap, which makes it difficult to reconstruct the damaged coating structure. THz frequency-wavelet domain deconvolution is applied to resolve the overlapping echoes. Based on the observed features in the deconvoluted THz signals, three types of damage, including corrosion, the appearance of blisters and delamination, are successfully identified. The corrosion area is located in the middle of the scratch, and the delamination occurs around the scratch. In the blister area, no delamination is observed, but the swelling of the coating is clearly revealed. Moreover, quantitative information in depth is also obtained by analyzing the deconvoluted data. The thickness of the delamination and the thickness of the coating in both the normal (undamaged) and blister areas can be calculated. 3D imaging results shown in Fig. 1 clearly exhibit the thickness distribution across the whole coating plane, which also highlights the features of the different damage mechanisms
Off-diagonal disorder model for exciton polaritons in layered media. Disorder-induced origin of radiative widths
Excitons in an infinite layered dipolar medium, such as a layered crystal or a multiple-quantum-well stack, with perfect periodicity exhibit a vanishing radiative width due to the requirement of energy-momentum conservation. Using a polariton model with off-diagonal disorder and a configuration-averaging technique, we show how deviations from the ideal case, specifically in the form of weak departures from perfect periodicity, and the resulting breaking of full translational invariance, give rise to a nonvanishing radiative width.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31260/1/0000166.pd
A note on the photoluminescence decay of thermalized excitons in quantum structures: Many-bond model
The temperature dependence of the photoluminescence decay time associated with the radiative decay of a thermalized exciton population in a quantum well or wire is shown to be independent of the number of exciton bands involved.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31170/1/0000069.pd
Plasmon dispersion in metal nanoparticle chains from angle-resolved scattering
We present angle and frequency resolved optical extinction measurements to
determine the dispersion relation of plasmon modes on Ag and Au nanoparticle
chains with pitches down to 75 nm. The large splitting between transverse and
longitudinal modes and the band curvature are inconsistent with reported
electrostatic near-field models, and confirm that far-field retarded
interactions are important, even for -sized structures. The data
imply that lower propagation losses, larger signal bandwidth and larger maximum
group velocity then expected can be achieved for wave vectors below the light
line. We conclude that for the design of optical nanocircuits coherent
far-field couplings across the entire circuit need to be considered, even at
subwavelength feature sizes.Comment: 4 pages, 4 figures, colo
Optical absorption in semiconductor quantum dots: Nonlocal effects
The optical absorption of a single spherical semiconductor quantum dot in an
electrical field is studied taking into account the nonlocal coupling between
the field of the light and the polarizability of the semiconductor. These
nonlocal effects lead to a small size anf field dependent shift and broadening
of the excitonic resonance which may be of interest in future high precision
experiments.Comment: 6 pages, 4 figure
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