Results 131 to 140 of about 367 (159)

Optical interpretation of linear-optics superradiance and subradiance

Physical Review A, 2022
Super- and subradiance are usually described in the framework of Dicke collective states, which is an ``atomic picture'' in which the electromagnetic field only provides an effective interaction between the atoms. Here, we discuss a complementary picture,
S Asselie, W Guerin
exaly   +3 more sources

Subradiance and superradiance-to-subradiance transition in dilute atomic clouds [PDF]

Physical Review A, 2020
We experimentally study subradiance in a dilute cloud of ultracold rubidium (Rb) atoms where $n λ_a^3 \approx 10^{-2}$ ($n$: atomic density, $λ_a$ excitation wavelength) and the on-resonance optical depth of the cloud is of order unity. We show that in the strong excitation regime, the subradiant time-scales depend on the excitation fraction of the ...
Das, Diptaranjan, Lemberger, B., Yavuz, D. D.   +2 more
exaly   +3 more sources

Super- and subradiance in dilute disordered cold atomic samples: observations and interpretations

Advances in Atomic, Molecular and Optical Physics, 2023
When a photon is sent onto an atomic ensemble, it interacts collectively with the $N$ atoms of the sample and not simply with one of them. This results in measurable modifications in the scattering rate, the emission diagram or the temporal dynamics ...
W Guerin
exaly   +2 more sources

Superradiance and subradiance in inverted atomic arrays

Physical Review A, 2022
Superradiance and subradiance are collective effects that emerge from coherent interactions between quantum emitters. Due to their many-body nature, theoretical studies of extended samples with length larger than the atomic transition wavelength are usually restricted to their early time behavior or to the few-excitation limit.
Oriol Rubies-Bigorda, Susanne F Yelin
exaly   +3 more sources

Symmetry-protected single-photon subradiance

Physical Review A, 2016
We study the protection of subradiant states by the symmetry of the atomic distributions in the Dicke limit, in which collective Lamb shifts cannot be neglected. We find that anti-symmetric states are subradiant states for distributions with reflection symmetry. Continuous symmetry can also be used to achieve subradiance.
Han Cai, Da-Wei Wang, Anatoly A Svidzinsky   +2 more
exaly   +4 more sources

Controlled Dicke Subradiance from a Large Cloud of Two-Level Systems

Physical Review Letters, 2012
Dicke superradiance has been observed in many systems and is based on constructive interferences between many scattered waves. The counterpart of this enhanced dynamics, subradiance, is a destructive interference effect leading to the partial trapping ...
Tom Bienaime, N Piovella, R Kaiser
exaly   +2 more sources

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Subradiant Directional Memory in Cooperative Scattering

Conference on Lasers and Electro-Optics, 2022
Using ensembles of coupled point-like scatterers, we demonstrate long-living, backscattering directional memory in spatially bounded random media. This counter-intuitive phenomenon emerges from subradiant quasi-modes located in the vicinity of medium’s interface.
Z. Shen, A. Dogariu
openaire   +1 more source

Experimental Evidence for Subradiance

Physical Review Letters, 1985
The first observation of the subradiance phenomenon is reported. As previously predicted, destructive interatomic interference may prevent cooperative deexcitation of a collection of atoms from being complete. In the case of a $j=\frac{3}{2}\ensuremath{\rightarrow}{j}^{\ensuremath{'}}=\frac{1}{2}$ transition, for example, half the atoms remain excited ...
, Pavolini, , Crubellier, , Pillet, , Cabaret, , Liberman   +4 more
openaire   +2 more sources

Subradial Functions and Compact Embeddings

Труды Математического института им. Стеклова, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Sickel, Winfried, Skrzypczak, Leszek
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Single photon subradiance and superradiance revisited: a group theoretic analysis of subradiant states

Physica Scripta, 2016
Single photon emission from a collection of resonantly excited two-level atoms is an expanding field. Recent work has shown single photon superradiance from an extended ensemble yields enhanced directional spontaneous emission. This paper presents an operator which commutes with the observables and breaks their degeneracy for the single photon states ...
Philip A Vetter, Luojia Wang, Da-Wei Wang, Marlan O Scully   +3 more
openaire   +1 more source