Nuclear Polaritons in the Mössbauer Absorber

Haas, Martín; Hizhnyakov, V.; Realo, E.; Jõgi, J.

doi:10.1002/pssb.2221490131

Cited by 15 publications

(12 citation statements)

References 10 publications

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“…(19). If b/∆ = ±π, the slow field also interferes constructively with the phase shifted incoming field at t t 1 .…”

Section: B Nonresonant Casementioning

confidence: 99%

“…The former is defined by the time t 0 at which the source is formed in the 14.4 keV state and the latter specifies the coherence time of the photon τ ph = 1/γ. Such a time dependence of the single-photon field has been detected, using radiation of a single nucleus in time delayed coincidence measurements of gamma photons emitted in a nuclear cascade [7,[16][17][18][19][20]. Usually 57 Co nuclei are incorporated into a solid, which does not produce quadrupole and Zeeman magnetic splitting of nuclear spin states.…”

Section: Photon Filtering Through a Resonant Absorbermentioning

confidence: 99%

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Radiation burst from a singleγ-photon field

2011

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The radiation burst from a single gamma-photon field interacting with a dense resonant absorber is studied theoretically and experimentally. This effect was discovered for the fist time by P. Helisto et al., Phys. Rev. Lett. 66, 2037Lett. 66, (1991 and it was named "gamma echo". The echo is generated by 180-degree phase shift of the incident radiation field, attained by an abrupt change of the position of the absorber with respect to the radiation source during the coherence time of the photon wave packet. Three distinguishing cases of "gamma echo" are considered, i.e., the photon is in exact resonance with the absorber, close to resonance (on the slope of the absorption line), and far from resonance (on the far wings of the resonance line). In resonance the amplitude of the radiation burst is two times larger than the amplitude of the input radiation field just before its phase shift. This burst was explained by P. Helisto et al. as a result of constructive interference of the coherently scattered field with the phase shifted input field, both having almost the same amplitude. We found that out of resonance the scattered radiation field acquires an additional component with almost the same amplitude as the amplitude of the incident radiation field. The phase of the additional field depends on the optical thickness of the absorber and resonant detuning.Far from resonance this field interferes destructively with the phase-shifted incident radiation field and radiation quenching is observed. Close to resonance three fields interfere constructively and the amplitude of the radiation burst is three times larger than the amplitude of the input radiation field.

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“…(19). If b/∆ = ±π, the slow field also interferes constructively with the phase shifted incoming field at t t 1 .…”

Section: B Nonresonant Casementioning

confidence: 99%

Section: Photon Filtering Through a Resonant Absorbermentioning

confidence: 99%

Radiation burst from a singleγ-photon field

2011

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“…The former is defined by the time t 0 = 0 at which the source is placed in the excited state and the latter specifies the coherence time or the mean correlation time of the photon τ ph = 1/∆ ph [14]. Such a time dependence of the single-photon field was detected from radiation of a single organic dye molecule in solvents [3], in time delayed coincidence measurements (TDCM) of photons emitted in an atomic cascade (optical domain) [14] and in a nuclear cascade (gamma domain) [15,16,17,18,19].…”

Section: The Influence Of Causality On the Spectrum Of A Single Pmentioning

confidence: 99%

“…The photons of interest, a(t) and b(t), can be selected by interference filters (optical domain) [14] or these photons can be of very different energies such that different kind of detectors are used to detect them separately (gamma domain) [15,16,17,18,19]. In the TDCM detection scheme the energy of these photons is converted by high-speed, high-gain photomultipliers to electric pulses, which are then amplified and sent to fast discriminators.…”

Section: The Influence Of Causality On the Spectrum Of A Single Pmentioning

confidence: 99%

Single photon emitted by a single particle in free-space vacuum modes and its resonant interaction with two- and three-level absorbers

2007

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We consider the time-delayed coincidence counting of two photons emitted in a cascade by a single particle (atom, molecule, nucleus, etc). The time-dependence of the probability amplitude of the second photon in the cascade has a sharply rising leading edge due to the detection of the first photon, as results from causality. If a macroscopic ensemble of resonant two-level absorbers is placed in the path of the second photon between the radiation source and the detector, the photon absorption does not follow Beer's law due to the time-asymmetric shape of the photon.For very short delay times almost no absorption takes place, even in an optically dense medium.We analyze the propagation of such a second photon in a thick resonant three-level absorber if a narrow electromagnetically induced transparency (EIT) window is present at the center of the absorption line. It is shown that the EIT medium can change the asymmetric time dependence of the photon probability amplitude to a bell shape (EIT filtering). This bell-shaped photon interacts much more efficiently with an other ensemble of two-level absorbers chosen, for example, to store this photon and the information it carries.

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“…A series of polariton effects are known in optics where the strong delay of the light propagation has recently become an actual field of research [1,2]. One such effectthe delay of prolonged pulses, emitted by a radioactive Mössbauer source -has also been experimentally observed [3]. Recently, the polariton origin of the cooperative effects, arising at the propagation of the synchrotron radiation (SR) in the perturbed two-target resonant systems, has been pointed out in [4].…”

Section: Introductionmentioning

confidence: 99%

Dynamical beats of forward-scattered resonant synchrotron radiation as a nuclear polariton effect

Haas

Winkler

2006

Hyperfine Interact

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The decay of the nuclear exciton (immobile collective excitation), created by a pulse of synchrotron radiation, is analyzed. It is shown that in the later phases of the decay, the exciton becomes localized at the sample's frontal surface. Inside the sample, the secondary gamma-quanta, emitted by the contracting exciton, are converted into polaritons (mobile nuclear excitations) characterized by different frequencies and equal group velocities. On the sample's back surface, the polariton interference causes a beating structure of the transmitted radiation, observed in experiments.

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Nuclear Polaritons in the Mössbauer Absorber

Cited by 15 publications

References 10 publications

Radiation burst from a singleγ-photon field

Radiation burst from a singleγ-photon field

Single photon emitted by a single particle in free-space vacuum modes and its resonant interaction with two- and three-level absorbers

Dynamical beats of forward-scattered resonant synchrotron radiation as a nuclear polariton effect

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