Spatial Structure Of Superradiance
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ContinuousContinuous superradiant clocks
spatial mode structure coherence. pulsed superradiance on Sr mHz transition, Science Advances, 2, e1601231 (2016) How can superradiance be maintained?
Quasi-optical Theory of Terahertz Superradiance from an
which the electron beam interacted with a spatial harmonic of the volume waveguide mode possessing a fixed transverse structure. For wavelengths shorter than one millimeter, the conditions of ensuring the electron beam transport and reducing Ohmic losses imply the use of oversized (or open) slow-wave systems. Accordingly, it is necessary to
Superradiant Emission from AlInGaAs/InGaAsP Quantum-Well
optical pulses, superradiance (SR) has been investigated both theoretically and experimentally [1-3] since the concept was first proposed in 1954 . SR emission has been of particular interest because of its unique properties of femtosecond pulse generation, spatial coherency and large field amplitude. It has
VIEWPOINT Supermassive Black Hole May Constrain Superlight
Jul 10, 2019 large-scale galactic structure that is observed today. On the other hand, if the dark matter particles have a mass around or slightly above 10 22 eV/c2, the large spatial extension of their quantum wave function could actually solve some problems at subgalactic scales with the standard cosmologi-cal model, which assumes a heavy dark matter
Coherence-Enhanced Imaging of a Degenerate Bose-Einstein Gas
Models of superradiance have been proposed that pre-dict the spatial inhomogeneities that we observe [22,23]. In these models, the initiation of collective scattering is treated as in Dicke s original work  with light scat-tering leading to the occupation of atomic recoil modes that are propagating replicas of the unscattered atomic state.
Superradiant Behavior of Cr3+ ions in Ruby Revealed by
to the excitations appearing as spatial phase factors . Superradiance is a consequence of extra coherence in the system, which can be observed in additional ways on top of an increased emission
SUPERRADIANCE AND TOPOLOGICAL QUANTUM OPTICS IN ATOMIC A
superradiance, subradiance and collective Lamb shift in an atomic ensemble; 2. novel topological effect in quantum optics system, such as Haldane model, synthetic magnetic ﬁeld in superradiance lattice and synthetic spin-orbit interaction in Fock-state lattices.
Ultra-low-loss on-chip zero-index materials
Light travels in a zero-index medium without accumulating a spatial phase, resulting in perfect spatial coherence. Such coherence brings several potential applications, including arbitrarily shaped waveguides, phase-mismatch-free nonlinear propagation, large-area single-mode lasers, and extended superradiance. A promising platform to achieve
Laser field control of subradiant states of a system of
example, [4 6] and review ) was focused on superradiance. An interesting effect of switching between the Q1 and Q2 states, caused by the variation of the spatial structure of the exciting laser pulse, was considered by Das et al. . As for
On some novel features of the Kerr Newman-NUT spacetime
Besides understanding the geodesic structure, it is of utmost importance to explore the possibilities of energy extraction from black holes as well. In particular, the phe-nomenonofPenroseprocess,superradiance[27,28]and the Bañados Silk West effect are well studied in the context of Kerr spacetime . Implications and modiﬁcations to
Synthesized magnetic field of a sawtooth superradiance
superradiance lattice (SL) in standing wave-coupled electromagnetically induced transparency, a far-detuned standing-wave ﬁeld is introduced to synthesize a magnetic ﬁeld. The relative spatial phase between the two standing-wave coupling ﬁelds introduce a magnetic ﬂux in the sawtooth loop transitions of the lattice.
Two-dimensional spatial coherence of excitons in
Two-dimensional spatial coherence of excitons in semicrystalline polymeric semiconductors: The effect of molecular weight Francis Paquin,1 Hajime Yamagata,2 Nicholas J. Hestand2, Maciej Sakowicz,1 Nicolas Bérubé,1 Michel Côté,1 Luke X. Reynolds,3 Saif A. Haque,3 Natalie Stingelin,4 Frank C. Spano,2,* and Carlos Silva1,†
Exciton-light coupling in quantum wells: From motional
The superradiance regime is realized when the exciton-polariton radiative decay rate exceeds the inhomogeneous broadening and may be achieved by a further increase in the number of QW s in the structure. All the above effects com-pletely disappear if the average exciton resonance frequency
Ab Initio Molecular Orbital Calculations of
The LH2 structure data suggests that the basic building block of the antenna is the (protamer) Râ-subunit, such that the B850 ring is composed of Bchl a molecules organized as dimers.1,18 Accordingly, we will refer to the pair of Bchls within the subunit as intrapolypeptide, and a pair of Bchls from adjacent subunits as interpolypeptide.
Room-temperature spontaneous superradiance from single
Superradiance (SR) is a cooperative phenomenon which occurs when an ensemble of quantum emitters couples collectively to a mode of the electromagnetic ﬁeld as a single, massive dipole that radiates photons at an enhanced rate. Previous studies on solid-state systems either reported SR from sizeable crystals with at least one spatial dimension
Generation of Cherenkov superradiance pulses with a peak
erator 4 ns, 330 kV, 2.6 kA 0.6 0.8 ns superradiance pulses with a peak power of 1.2 GW and a conversion factor of 1.5 were obtained. Similar experiments at Ka-band based on the RADAN-303
Exact Evaluation of Statistical Moments in Superradiant Emission
Jun 23, 2019 interaction in cavities. Almost 70 years after its discovery, superradiance remains a topic of intense experimental and theoretical research in quantum many-body physics [6,7]. Although its origins can be tracked down to the foundation of quantum optics, superradiance has found applications in condensed-matter physics.
Analog of superradiant emission in thermal emitters
superradiance are closely related to the requirements for observing quantum superradiance: The thermal emitters must support optical resonance, and these resonant emitters must be placed in a deep subwavelength dimension as shown in Fig. 1(b). For the organization of the paper, we will ﬁrst use
Superradiance Steering, Switching, and Trapping in a Two
superradiance pattern emerging from a pencil-like sample. Section 5 analyzes the structure of the excitation decay of the single atom embedded into a 2D photonic crystal. Finally, in Sec. 6, the results are summarized and applications are discussed. 2. The Model Inhomogeneous Superradiance Field and Resonant Current
Molecular physics: Subradiance spectroscopy
into the structure and properties of matter. As they report in Nature Physics, Bart McGuyer and colleagues1 now demonstrate a significant step forward for spectroscopy with ultracold molecules. By adapting atomic clock techniques, they characterized the optical transition oscillator strengths of subradiant molecular states with exquisite precision.
Models with recoil for Bose Einstein condensation and
Rayleigh superradiance this means that the phase transition corresponding to BEC is at the same time also a transition into a matter-wave grating i.e. a frozen spatial density wave structure, see Section 4. The fact that recoiling atoms are able to interfere with the
Probing Axions with Event Horizon Telescope Polarimetric
axion cloud at the emission point, whose spatial depend-ence will be discussed later. Superradiance and bosenova. The axion equation of motion from Eq. (1) in a Kerr background is a ¼ μ2a; ð6Þ where we take VðaÞ¼1 2 μ 2a and neglect the self-interaction for now. After imposing infalling boundary
Steady-state, cavityless, multimode superradiance in a cold vapor
superradiance therefore represents an important step toward realizing controllable condensed matter systems involving phase transitions via emergent structure, and may provide insight into the role of quantum phase transitions in such systems [7,10,13]. 013823-2
Ultrashort Pulse Generation and Superradiance in FELs
superradiance regime (indicated by L +) with higher power and shorter pulse length Once getting into the saturation, the tail is formed The pulse length is determined by the structure between L+ and L-, both from the same origin of pulse splitting. FLS2018 ì= V ( Q
EXCITON PHOTON AND PHONON INTERACTIONS IN SEMICONDUCTOR
2.2 Schematic view of spatial band structure of semiconductor heterostructure. 12 3.6 Comparison between superradiance, subradiance and single dot spontaneous
Dynamics of a Spin 1 Ferromagnetic Condensate
method, we are able to derive high resolution spatial maps of the condensate num-ber and obtain a spatially resolved measure of the ﬂrst-order correlation function. With coherence-enhanced imaging we are able to study the spatial development of extended sample superradiance in which inhomogeneous scattering is observed.
There is an analogue of the Penrose process for waves, called superradiance: For waves of certain values of angular momentum (angular quantum number or separation constant), the scattered wave amplitude exceeds the incident amplitude. In quantum ﬁeld theory this eﬀect leads to production of particle-antiparticle pairs by the rotating black
Cold exciton gases in coupled quantum well structures
J. Phys.: Condens. Matter 19 (2007) 295202 L V Butov Figure 1. (a) 2D and (b) 3D images of the spatial PL pattern in a CQW structure. The pattern features include the inner exciton ring, the external exciton ring, the localized bright spots (LBSs),
Dicke-type phase transition in a spin-orbit-coupled Bose
spatial modulation of the density. In the experiment, the ﬁrst term dominates for a reasonably large O and the plane wave phase is preferred (that is, possesses the lowest energy)22. In this phase, all atoms collectively interact with a single plane wave mode, similar to atoms conﬁned in a cavity interacting only with the cavity mode.
Collective spontaneous emission in coupled quantum dots
also the control of the spatial structure of the spontaneous emission. The latter appears in, e.g., directed spontaneous emission from an extended ensemble,19 correlated emission of a single photon,20,21 quantum interference in cooperative Dicke emission,22 collective Lamb shift in single photon superradiance,23 and ﬁnite time disentanglement
Photochemical Control of Exciton Superradiance in Light
collective dipoles. Energetic disorder decreases the excitonic spatial extent, as well as the transition dipole. (b) Chemical structure of the C8S3 monomer and 3D tubular structure of the LHNs (from Eisele et al.24). (c) Cryo-TEM of as-prepared LHN aggregates in sucrose−trehalose solution. (d) Absorption and emission of C8S3 monomers and LHNs.
The Spectra of Gravitational Atoms Daniel Baumann, Horng Sheng Chia, John Stout and Lotte ter Haar Institute for Theoretical Physics, University of Amsterdam, Science Park 904, Am
arXiv:gr-qc/0004016v1 5 Apr 2000 - USTC
spatial extent, in contrastto classicalmechanics. The three-dimensional prob-lems have taught us, among other things, about the degeneracy of the energy levels. The case of the harmonic oscillator is, of course, very exceptional since Hamiltonians of the same type appear in all problems involving quantized os-cillations.
geometrical structure of this ﬁeld reproduces that of the ex-citation laser beam. This assumption, however, is correct only for the sample geometries of large (>1) Fresnel num-bers and excitation pulses with small Rabi areas. Highly en-ergetic excitation pulses bring about spatial anomalies in the emitted ﬁelds.
Superradiant scattering of orbital angular momentum beams
degrees of freedom, OAM beams result from spatial wave distributions that have a helical structure. OAM beams can be formed in nearly any effective ﬁeld theory with propagating modes, such as electromagnetism (i.e., light beams ) and ﬂuid dynamics (i.e., sound beams in air or water), and as
Modal representation of spatial coherence in dissipative and
in the phenomenon of superradiance [12,13]. Other coherent processes are also driven by Im(G), such as the process of focusing by time reversal in a closed cavity . From this observation, Caz´e et al. have recently proposed the concept of cross density of states (CDOS) to characterize the spatial coherence of a complex photonic or plasmonic
Superradiance Coherence Sizes in Single-Molecule Spectroscopy
2.5 Å resolution structure of the LH2 antenna complex of purple bacteria.1 The antenna is made of an inner ring (the B850 system) with 18 bacteriochlorophyll a (BCla) molecules and an outer ring (the B800 system) with 9 BCla. Cyclic complexes appear also in other systems such as LH1 which has 32 chlorophylls.
Superradiance: the principles of generation and
Keywords: collective spontaneous emission, Dicke superradiance, coherent processes, mode selection, multimode lasers 1. Introduction. From the quantum Dicke superradiance problem to the classical dissipative instability problem 1.1 Various aspects of the superradiance concept Quite a spectacular term superradiance , initially proposed
Trapped atoms in one-dimensional photonic crystals
emission [9 11], guided superradiance and polaritons [12 14], as well as highly reﬂecting atomic mirrors [15, 16]. The interplay of atomic emission into the waveguide and photon-mediated forces can lead to self-organization of atoms into exotic spatial conﬁgurations along the waveguide [17, 18].