共查询到20条相似文献,搜索用时 250 毫秒
1.
E. M. Belenov S. V. Grigor'ev A. V. Nazarkin I. V. Smetanin 《Journal of Russian Laser Research》1990,11(5):498-503
The coherent interaction of an electromagnetic field with the medium in those cases in which the current emission in matter can be described within the framework of the two-level quantum system is considered. The physical nature of such cases is quite different. The media may be two-level particles (atoms or molecules), superconducting planar structures (e.g., high-temperature superconductors, HTSC, or relativistic electron beams in a free-electron laser (FEL). Also, the dynamics of the electromagnetic field for the visible, microwave, and x-ray wavelength region can be described. A short review of the results is given in the section on two-level particle media. The results of studying the interaction of the field with the electron beams in an x-ray FEL and the field interaction with the HTSC medium are the first to be reported.Translated from Preprint No. 82, Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow, 1990. 相似文献
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We report the coexistence of TE and TM surface modes in certain same
frequency domain at the interface between one isotropic regular medium and
another biaxially anistotropic left-handed medium. The conditions for the
existence of TE and TM polarized surface waves in biaxially anisotropic
left-handed materials are identified, respectively. The Poynting vector and
the energy density associated with surface modes are calculated.
Depending on the system parameters, either TE or TM surface modes can
have the
time averaged Poynting vector directed to or opposite to the mode phase
velocity. It is seen that the characteristics of surface waves in biaxially
anisotropic left-handed media are significantly different from that in
isotropic left-handed media. 相似文献
4.
M. B. Belonenko A. S. Sasov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(1):130-133
The dynamics of solitons of self-inducted transparency is theoretically and numerically investigated in the case when atoms described in the two-level approximation fit into a medium with ferroelectric properties. The interaction between electromagnetic pulses in the medium and two-level dopant atoms is considered. 相似文献
5.
A theory is constructed of self-induced transparency for a surface wave, propagating on the boundary surface of two media, one of which is a resonance one, and also for a localized TE-mode in dielectric waveguide, containing non-intersecting two-level atoms. An evident expression is found for a pulsing solition, formed in these conditions, in terms of initial data. 相似文献
6.
《Annals of Physics》1985,160(1):75-101
The previously developed self-consistent mean field theory of atoms entering an interacting medium is specialized to two-level alien atoms. It is shown that the medium may invert or split the original two levels, and that there is an intimate connection between the dressed atom spectrum and the statistical nature of the ensemble of alien atoms in the self-consistent mean field approximation. The optical susceptibility of alien atoms while inside the medium is calculated, and the lineshape and position of the optical resonance are shown to depend on the intensity of the optical field applied. There may be more than one phase possible for the atomic ensemble as a result of optical excitation. 相似文献
7.
We have solved a boundary-value problem for a ball probe interacting with a flat dielectric surface in an external optical radiation field. This interaction gives rise to the optical size resonance at frequencies significantly different from the natural frequencies of two-level atoms both in the medium and in the probe with allowance for the local field corrections. These resonances depend significantly on the distance from the probe center to the surface, on the ball probe size, on the concentration of two-level atoms in the probe and in the medium, on the spectral line width, and on the atomic inversion. The field strengths inside and outside the ball probe and a semiinfinite dielectric medium have been calculated in the near-field and wave zones. It is shown that the proposed electrodynamic theory of optical near-field microscopy agrees with the results of experimental measurements. 相似文献
8.
The microscopic theory of a transitional layer on the ideal surface of a semi-infinite absorbing or nonabsorbing isotropic dielectric is developed within the framework of classical optics when the polarization vector of the medium is a linear function of the electric field strength inside the medium. The concentration of atoms (molecules) of the medium and their polarizability are independent of coordinates and are constant inside the medium and close to its surface. The consideration is carried out within the framework of the concept of a discrete-continuous dielectric, in which the fields of dipoles of discretely distributed atoms (molecules) inside the Lorentz sphere surrounding the observation point are taken into account. The near-field effect is shown to result in a nonexponential behavior of the field nearby the surface. The thickness of the transitional layer can be found from experimental values of the reflected wave amplitude. 相似文献
9.
A. S. Kadochkin 《Journal of Applied Spectroscopy》2007,74(4):552-560
We have solved the problem in which a thin metal wafer (probe) with a nanohole interacts with the flat surface of a metastructured
film consisting of metal nanoparticles in an external optical radiation field. Nanoparticles are considered as two-level atomic
systems. This interaction of the wafer-probe and the flat surface in the external optical radiation field gives rise to optical
near-field resonance, the frequency of which differs significantly from the natural frequencies of two-level atoms in the
medium and the probe. The fields inside and outside the probe and metastructured film are calculated in the near-field and
far-field zones. The maximum resolution, which is achievable in the suggested scheme of near-field optical microscopy, can
reach about 10 nm.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 4, pp. 499–506, July–August, 2007. 相似文献
10.
A. A. Zabolotskiĭ 《Journal of Experimental and Theoretical Physics》2007,105(4):687-695
Polarization dynamics of optical pulses in an isotropic two-level medium is analyzed by solving an integrable system of evolution equations without using the slowly varying envelope approximation. The analysis is focused on the regime of unidirectional pulse generation in an initially inverted medium. Qualitative difference in polarization dynamics is revealed between few-cycle and quasi-monochromatic pulse propagation 相似文献
11.
A. Wünsche 《Annalen der Physik》1978,490(4):303-320
Reflection and Refraction of Light in Uniaxial Media The formulae for the amplitude relations for the reflection and refraction of plane monochromatic light waves at a plane interface between an isotropic and an arbitrarily anisotropic medium, derived in an earlier paper by the author, are specialized here to the case of uniaxial media. The incidence both from the isotropic and from the uniaxial medium is dealt with. A series of special cases (normal incidence, optical axis parallel or normal to the plane of incidence, transition from uniaxial to isotropic media a.o.) are considered. 相似文献
12.
G. T. Adamashvili 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2012,66(4):101
A theory of an optical vector breather of self-induced transparency of surface plasmon polaritons is constructed. The nonlinear
surface TM-modes propagating along the interface separating an isotropic medium and anisotropic left-handed material are investigated.
A transition layer sandwiched between the connected media is described using a model of a two-dimensional gas of semiconductor
quantum dots. Explicit analytical expressions for the shape and parameters of the surface vector breathers are obtained as
well as simulations of the space-time dynamics of two-dimensional vector breathers presented with realistic parameters which
can be reached in current experiments. It is shown that properties of a surface vector breather with phase modulation depends
on the parameters of the quantum dots, the connected media and the transverse structure of the surface wave. 相似文献
13.
The nonlinear optical (local) response of a dense collection of two-level atoms embedded in a linear dielectric medium is investigated theoretically. The nonlinear response of absorption and dispersion of two-level atoms associated with a weak probe field in the presence of a strong pump field is calculated in terms of the linear response theory. The numerical results show that the absorption and dispersion spectra are different from those in vacua because of the local-field effect enhancement and the local cooperative effect. 相似文献
14.
It is shown that linear stationary optical size resonances can be used for high-precision measurement of the spatial distribution of atoms in structured atomic systems on the surface and inside of isotropic optical media by changing the frequency and the polarization of external continuous optical radiation. 相似文献
15.
Zabolotskaya EA Ilinskii YA Hamilton MF 《The Journal of the Acoustical Society of America》2007,121(4):1873-1878
Nonlinear surface waves in soft, weakly compressible elastic media are investigated theoretically, with a focus on propagation in tissue-like media. The model is obtained as a limiting case of the theory developed by Zabolotskaya [J. Acoust. Soc. Am. 91, 2569-2575 (1992)] for nonlinear surface waves in arbitrary isotropic elastic media, and it is consistent with the results obtained by Fu and Devenish [Q. J. Mech. Appl. Math. 49, 65-80 (1996)] for incompressible isotropic elastic media. In particular, the quadratic nonlinearity is found to be independent of the third-order elastic constants of the medium, and it is inversely proportional to the shear modulus. The Gol'dberg number characterizing the degree of waveform distortion due to quadratic nonlinearity is proportional to the square root of the shear modulus and inversely proportional to the shear viscosity. Simulations are presented for propagation in tissue-like media. 相似文献
16.
Journal of Experimental and Theoretical Physics - A model of evolution of field pulses in a medium of two-level atoms implanted into an anisotropic matrix is considered. It is shown that the system... 相似文献
17.
Jun-Mao Ma Zhi-Yong Jiao Ning Li 《International Journal of Theoretical Physics》2007,46(10):2550-2559
The properties of quantum entanglement in the two-photon Tavis–Cummings model with a Kerr nonlinearity are studied in terms
of quantum information entropy theory. The reduced quantum entropy is employed to investigate the quantum entanglement between
two two-level atoms and a single-mode coherent field. The relative quantum entropy is employed to investigate the quantum
entanglement between the two two-level atoms. The influences of the nonlinear interaction of the Kerr medium with the field
and the atomic dipole-dipole interaction on the properties of quantum entanglement of the system are also examined. Some important
results are obtained. 相似文献
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V. V. Tyutekin 《Acoustical Physics》2007,53(4):448-454
The propagation of quasi-Rayleigh waves along an impedance-loaded plane boundary of an isotropic elastic half-space is studied theoretically. The dispersion equation of these waves is derived with allowance for the fact that an impedance load has both normal and tangential components. The conditions for the existence of such waves are analyzed depending on the magnitude and nature of each of these components. Specific examples of calculating the quasi-Rayleigh wave velocities are considered: for the models of surface and bulk cracked media, for a fluid layer in an elastic medium, and for a resonant load. 相似文献