Photon Emission from a False Vacuum of Semiconductors

Okushima, Teruaki; Shimizu, Akira

doi:10.1143/jjap.34.4508

Cited by 27 publications

(26 citation statements)

References 12 publications

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“…On the other hand, when the mirrors move very rapidly, quantum state of the EM field cannot adiabatically follow the instantaneous vacuum state for each position of the mirrors, resulting in the creation of photons. Such excitation of the quantum field caused by non-adiabatic change of the vacuum state [2,3,4] is referred to as the dynamical Casimir effect (DCE), and there have been numerous investigations into this subject [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31], e.g., spectral properties of created photons [5], radiation pressure on a moving mirror [6,7,8], squeezing in the radiation field [9,10], effective Hamiltonian approach [11,12,13,14], time-varying refractive index [15,16,17,18], radiation from moving dielectrics [19,…”

Section: Introductionmentioning

confidence: 99%

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Dynamical Casimir effect without boundary conditions

Saito

Hyuga

2002

Phys. Rev. A

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The moving-mirror problem is microscopically formulated without invoking the external boundary conditions. The moving mirrors are described by the quantized matter field interacting with the photon field, forming dynamical cavity polaritons: photons in the cavity are dressed by electrons in the moving mirrors. The effective Hamiltonian for the polariton is derived, and corrections to the results based on the external boundary conditions are discussed.

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Section: Introductionmentioning

confidence: 99%

“…Although the quantum theory of the systems in which the EM field and matter interact with each other has been developed by many authors [32,33,34,35,36,37], such an approach to the DCE has hardly been made so far [17].…”

Section: Introductionmentioning

confidence: 99%

Dynamical Casimir effect without boundary conditions

Saito

Hyuga

2002

Phys. Rev. A

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“…Inset: Typical pulsed laser profile with each pulse train of order 10 ns (10-100 pulses) repeated every ∼10 ms. Each pulse is typically of order T = t e + t 0 + τ ∼ 100 ps and depends on the excitation time t e and relaxation time τ . in a consistent way, particularly to include dissipative effects (for particle creation in a crystal, based on a microscopic model without dissipation, see [6]). It is also interesting to note that working with a dielectric of finite thickness (resulting in more complicated Bessel functions; e.g., see [28,29]), does not result in the same wave equation or junction conditions in the limit of an infinitely thin dielectric for TM modes [30].…”

Section: A Plasma Sheet Modelmentioning

confidence: 99%

Towards particle creation in a microwave cylindrical cavity

Naylor

2012

Phys. Rev. A

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We present for the first time numerical results for the particle (photon) creation rate of Dynamical Casimir effect (DCE) radiation in a resonant cylindrical microwave cavity. Based on recent experimental proposals, we model an irradiated semiconducting diaphragm (SCD) using a time dependent 'plasma sheet' where we show that the number of photons created for the TM_{011} mode is considerably enhanced even for low laser powers (of microjoule order). Conversely to the moving mirror case, we also show that the fundamental TM mode (TM_{010}) is not excited for an irradiated plasma sheet. We show that polarization (arising due to the back reaction of pair created photons with the plasma SCD) implies losses for TM, but not TE modes. However, we argue that these losses can be reduced by lowering the laser power and shortening the relaxation time. The results presented here lead support to the idea that TE and, in particular, TM modes are well suited to the detection of DCE radiation in a cylindrical cavity.Comment: 13 pages, 10 figures, RevTex4-1, comments welcom

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“…For example, the photon generation from vacuum due to temporal variations of the dielectric function was discussed in [1][2][3][4][5][6] while the generation of photons due to a motion of dielectric boundaries was studied in [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Also, he pointed out that fast changes of electric properties can be achieved in semiconductors illuminated by laser pulses. This idea was propagandized by Man'ko [24], who proposed to use semiconductors with time-dependent properties to produce an analogue of the nonstationary Casimir effect (see also [5,25]). A more developed scheme, based on the creation of an electronhole 'plasma mirror' inside a semiconductor slab, illuminated by a femtosecond laser pulse, was proposed in [26] (in the single-pulse case).…”

Section: Introductionmentioning

confidence: 99%

Theory of the dynamical Casimir effect in nonideal cavities with time-dependent parameters

Dodonov

Додонов

2008

J. Phys.: Conf. Ser.

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Abstract.This is a brief review of the recent progress in the theory of dynamical (non-stationary) Casimir effect in non-ideal cavities and of existing proposals to observe this effect in a laboratory, with an emphasis on the experiment which is under preparation in the University of Padua. The main idea of this experiment is to simulate periodical displacements of the cavity wall by periodical strong changes of conductivity of a thin semiconductor slab illuminated by picosecond laser pulses. In this connection the theory of quantum damped oscillator with arbitrary time dependence of the frequency and damping coefficient has been developed in order to take into account intrinsic losses in the semiconductor slab due to a finite conductivity during the intermediate part of the excitation-recombination cycle. The influence of different parameters, such as the diffusion and mobility coefficients of carriers, surface recombination velocity, absorption coefficient of laser radiation, thickness of the slab and geometry of the cavity, is analysed. Analytical and numerical evaluations show that under realistic experimental conditions, several thousand of quanta of EM field ('Casimir photons') could be produced from the initial vacuum state in a high-quality cavity at the lowest resonance frequency 2.5 GHz. IntroductionVarious quantum effects caused by a time dependence of dielectric properties of different media were subjects of numerous studies for the past decades. For example, the photon generation from vacuum due to temporal variations of the dielectric function was discussed in [1][2][3][4][5][6] while the generation of photons due to a motion of dielectric boundaries was studied in [7][8][9].We consider the problem of photon generation in a selected mode of electromagnetic field inside a closed high-Q cavity due to periodical variations of the conductivity of a thin semiconductor layer deposited on the plane surface of a cavity wall. The main motivation for studying this problem is its relation to the experiment on observation of the nonstationary (or dynamical) Casimir effect (NSCE or DCE) which is under preparation in the university of Padua [10]. The idea is to use an effective electron-hole 'plasma mirror' created periodically on the surface of a semiconductor slab by illuminating it with a sequence of short laser pulses. If the interval between pulses exceeds the recombination time of carriers in the semiconductor, a highly conducting layer will periodically appear and disappear on the surface of the semiconductor film, thus simulating periodical displacements of the boundary.

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Photon Emission from a False Vacuum of Semiconductors

Cited by 27 publications

References 12 publications

Dynamical Casimir effect without boundary conditions

Dynamical Casimir effect without boundary conditions

Towards particle creation in a microwave cylindrical cavity

Theory of the dynamical Casimir effect in nonideal cavities with time-dependent parameters

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