55 research outputs found
Surface plasmon induced quantum interference at meta-material interface
In this work we investigate quantum interference in a four-level atom coupled
to a negative index meta-material (NIMM) plasmonic reservoir that supports both
TE and TM polarized surface plasmons (SP). This provides more options to
control SP interaction with emitters and hence more control of spontaneous
emission decays and spectrum. The spectrum depends critically on parameters
like the reservoir parameters, mode frequency, frequency dependent electric
permittivity and magnetic permeability, and the location of the atom. We report
orders of magnitude enhancement in the reservoir-modified decays and spectrum
compared to free space case. The rich atomic and plasmonic parameters provide a
wide range of flexibility and more options to control emission spectrum that
suits practical applications.Comment: 30 pages , 8 figures , research wor
Correlation between surface tension, work of adhesion in liquid metals/ceramic systems, and acoustic parameters
In the paper, a correlation between acoustic velocities V, elastic moduli M, and densities ρ, with surface tension σm, and work of adhesion Wad of different liquid metals on a given ceramic is studied and demonstrated. Simulation program is developed and used for scanning acoustic microscopy (SAM) under operating conditions, which favour the generation of acoustic waves. As found, for the given systems, all investigated acoustic parameters exhibit good dependences with both σm and Wad. Analysis and quantification of the results lead to the determination of semi-empirical formulas.В статті вперше демонструється кореляція між акустичними швидкостями V, пружніми модулями M, густинами ρ та поверхневим натягом σm, а також роботою адгезії Wad різних рідких металів на фіксованій кераміці. Використовується обчислювальна програма для сканувального акустичного мікроскопу (САМ) за умов, що є сприятливими задля ґенерування акустичних хвиль. Виявлено, що для конкретних систем усі досліджені акустичні параметри демонструють хорошу залежність від поверхневого натягу та роботи адгезії. Аналіза та кількісне визначення результатів привели до встановлення напівемпіричних формул.В статье исследуется и впервые демонстрируется корреляция между акустическими скоростями V, упругими модулями M, плотностями ρ и поверхностным натяжением σm, а также работой адгезии Wad различных жидких металлов на фиксированной керамике. Используется вычислительная программа для сканирующего акустического микроскопа (САМ) в условиях, благоприятных для генерирования акустических волн. Обнаружено, что для конкретных систем все исследованные акустические параметры демонстрируют хорошую зависимость от поверхностного натяжения и работы адгезии. Анализ и количественное определение результатов привели к установлению полуэмпирических формул
Quantum informatics with plasmonic metamaterials
Surface polaritons at a meta-material interface are proposed as qubits. The
SP fields are shown to have low losses, subwavelength confinement and can
demonstrate very small modal volume. These important properties are used to
demonstatre interesting applications in quantum information, i.e., coherent
control of weak fields and large Kerr nonlinearity at the low photon level
Surface plasmon resonance under conditions of electromagnetically induced transparency
A scheme for a surface plasmon resonance system under conditions of
electromagnetically induced transparency (EIT) is proposed. The system is
composed of three layers: a prism, a thin metal film, and a hybrid dielectric
consisting of EIT atoms and a background substance. A probe and a coupling
laser beam are input. Corresponding analytical formulas are derived for the
cases when one or both of the laser beams excite surface plasmon polaritons at
the metal/dielectric interface. Under resonance conditions, an extremely sharp
dip appears in the reflectivity-frequency spectrum of the probe field,
revealing new properties of two-dimensional EIT. The reflectivity is extremely
sensitive to shifts in the laser frequencies and atomic levels, and to
variations of permittivity of the substrate. This EIT-SPR system may to be used
for novel magnetometers and biosensors
Qualitative aspects of the entanglement in the three-level model with photonic crystals
This communication is an enquiry into the circumstances under which
concurrence and phase entropy methods can give an answer to the question of
quantum entanglement in the composite state when the photonic band gap is
exhibited by the presence of photonic crystals in a three-level system. An
analytic approach is proposed for any three-level system in the presence of
photonic band gap. Using this analytic solution, we conclusively calculate the
concurrence and phase entropy, focusing particularly on the entanglement
phenomena. Specifically, we use concurrence as a measure of entanglement for
dipole emitters situated in the thin slab region between two semi-infinite
one-dimensionally periodic photonic crystals, a situation reminiscent of planar
cavity laser structures. One feature of the regime considered here is that
closed-form evaluation of the time evolution may be carried out in the presence
of the detuning and the photonic band gap, which provides insight into the
difference in the nature of the concurrence function for atom-field coupling,
mode frequency and different cavity parameters. We demonstrate how fluctuations
in the phase and number entropies effected by the presence of the
photonic-band-gap. The outcomes are illustrated with numerical simulations
applied to GaAs. Finally, we relate the obtained results to instances of any
three-level system for which the entanglement cost can be calculated. Potential
experimental observations in solid-state systems are discussed and found to be
promising.Comment: 28 pages, 10 figures: Accepted in Applied Physics B: Laser and Optic
Coherent control of low loss surface polaritons
We propose fast all-optical control of surface polaritons (SPs) by placing an
electromagnetically induced transparency (EIT) medium at an interface between
two materials. EIT provides longitudinal compression and a slow group velocity
while matching properties of the two materials at the interface provides strong
transverse confinement. In particular we show that an EIT medium near the
interface between a dielectric and a negative-index metamaterial can establish
tight longitudinal and transverse confinement plus extreme slowing of SPs, in
both transverse electric and transverse magnetic polarizations, while
simultaneously avoiding losses.Comment: 4 pages, 5 figure
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