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 [4]. 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 [13] 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 [4]. Superradiance is a consequence of extra coherence in the system, which can be observed in additional ways on top of an increased emission


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 [3]) 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. [7]. 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[26],superradiance[27,28]and the Bañados Silk West effect are well studied in the context of Kerr spacetime [29]. 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


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.

The Ergosphere

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.

Superradiant self-diffraction

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 [1]) 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 [19]. 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].