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1.
The optical absorption of GaAs crystals with thicknesses d=0.4−4.4 μm is measured in the exciton-polariton resonance region at a temperature of 1.7 K. As the thickness is reduced,
both a broadening of the exciton line and increased absorption with a negligible Stark shift are observed. The way the absorption
spectra vary with crystal thickness is examined in terms of a competition between two regions for light-exciton interactions
in the crystal: in the field of surface charges and electric-field free.
Fiz. Tverd. Tela (St. Petersburg) 40, 869–871 (May 1998) 相似文献
2.
R. P. Seisyan 《Technical Physics》2011,56(8):1061-1073
The current status of basic photolithographic techniques allowing researchers to achieve results that seemed to be unrealistic
even a short time ago is reviewed. For example, advanced DUV photolithography makes it possible to exactly reproduce IC elements
25 times smaller in size than the wavelength of an excimer laser used as a lithographic tool. Approaches owing to which optical
lithography has pushed far beyond the Rayleigh-Abbe diffraction limit are considered. Among them are optical proximity correction,
introduction of an artificial phase shift, immersion, double exposure, double patterning, and others. The prospects for further
advancement of photolithography into the nanometer range are analyzed, and the capabilities of photolithography are compared
with those of electronolithography, EUV lithography, and soft X-ray lithography 相似文献
3.
R. P. Seisyan 《Technical Physics》2005,50(5):535-545
The basic concepts of high-resolution extreme ultraviolet nanolithography, which is aimed at producing ultra-large-scale integrated
circuits (with an integration one or two orders of magnitude exceeding present-day integration levels), are reviewed and substantiated.
The problems in and the current status of this field of technology are considered. 相似文献
4.
M.E. Sasin R.P. Seisyan M.A. Kaliteevski S. Brand R.A. Abram J.M. Chamberlain I.V. Iorsh I.A. Shelykh A.Yu. Egorov A.P. Vasil’ev V.S. Mikhrin A.V. Kavokin 《Superlattices and Microstructures》2010
We report on the first experimental observation of Tamm plasmon-polaritons (TPP) formed at the interface between a metal and a dielectric Bragg reflector (DBR). Contrary to conventional surface plasmons, TPPs have an in-plane wave vector less than the wave vector of light in vacuum, which allows for their direct optical excitation, and can be formed in both the TE and TM polarizations. The angular resolved reflectivity and transmission spectra of a GaAs/AlAs DBR covered by Au films of various thicknesses show the resonances associated with the TPP at low temperatures and at room temperature. The in-plane dispersion of TTPs is parabolic with an effective mass 4×10−5 of the free electron mass. 相似文献
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CoFe2O4-BaTiO3 composites were prepared using conventional ceramic double sintering process with various compositions. Presence of two phases
in the composites was confirmed using X-ray diffraction. The dc resistivity and thermoemf as a function of temperature in
the temperature range 300 K to 600 K were measured. Variation of dielectric constant (ɛ′) with frequency in the range 100 Hz to 1 MHz and also with temperature at a fixed frequency of 1 kHz was studied. The ac
conductivity was derived from dielectric constant (ɛ′) and loss tangent (tan δ). The nature of conduction is discussed on the basis of small polaron hopping model. The static value of magnetoelectric
conversion factor has been studied as a function of magnetic field. 相似文献
9.
Modifications of the exciton structure of the fundamental absorption edge in the GaAs crystals is experimentally studied at T = 1.7 K using the optical pumping at a photon energy that is significantly greater than the band gap. An increase in the amplitude of the fundamental state of the exciton is observed at a stable maximum energy. The dependence of the integral absorption on the pump intensity is interpreted in the framework of the concept of the excitonic polariton using the dissipative scattering of the exciton by free electrons that are generated by the pumping radiation. The constant of the electron-exciton interaction can be estimated with the aid of the solution to the inverse problem for initial pump levels. The integral absorption of the fundamental exciton state at liquid-helium temperatures can be used to characterize the purity of an epitaxial layer. The reasons for the lower saturation level of the integral absorption that is significantly less than the calculated level determined by the exciton oscillator strength need to be further studied. 相似文献
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Kh. Moumanis R. P. Seisyan M. É. Sasin A. V. Kavokin S. I. Kokhanovskii H. M. Gibbs G. Khitrova 《Physics of the Solid State》1998,40(5):731-733
Additional localization of holes due to Coulomb attraction to the electron located in a quantum well is important for light-hole
excitons in the heterostructure (In, Ga)As/GaAs. The fine structure of the optical and magneto-optical spectra of these quantum
wells is examined in detail with the formation of a “Coulomb well” and deformations taken into account.
Fiz. Tverd. Tela (St. Petersburg) 40, 797–799 (May 1998) 相似文献