Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1994, Vol.3, No.11
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CLASSICAL AREAS OF PHENOMENOLOGY

EFFECTS OF MICROSTRUCTURES WITH DIMENSIONS SMALLER THAN OPTICAL WAVELENGTH ON SINGLE GROOVE DIFFRACTION

Lü HUI-BIN, R.E.BURGE, D.N.QU, X.YUAN
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 809-813 doi: 10.1088/1004-423X/3/11/002
Full Text: [PDF 154 KB] (Downloads:285)
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The experimental results showed that the microstructures of defects on the edges and walls of the single groove with their dimensions smaller than the wavelength of the incident light can produce effects not only on the diffraction of different polarization light but also on the symmetry of both positive and negative diffraction orders. It is possible to cause the narrow peaks with opposite directions appearing at corresponding positions on the two diffraction intensity curves when the polarization directions of the incident light are perpendicular to each other, and to cause the diffraction peaks to be asymmetric when the incident light for the two curves is of the same polarization direction.

PHASE MATCHING AND DISTRIBUTION OF OPTICAL VORTICES IN THREE COUPLING DEGENERATE GAUSS-LAGUERRE MODES

WANG KAI-GE
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 814-820 doi: 10.1088/1004-423X/3/11/003
Full Text: [PDF 208 KB] (Downloads:676)
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We analyze the coupling equation for three degenerate Gauss-Laguerre modes in laser. For the multimode operation, there is a phase matching relation from which the distribution of optical vortices in the transverse patterns of optical field can be determined.

NONLINEAR EXCITED STATE ABSORPTION IN CADMIUM-PORPHYRIN-LIKE

SI JIN-HAI, YANG MIAO, WANG YU-XIAO, ZHANG LEI, LI CHUN-FEI, WANG DUO-YUAN, DONG SHI-MING, SUN WEN-FANG
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 821-827 doi: 10.1088/1004-423X/3/11/004
Full Text: [PDF 180 KB] (Downloads:363)
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Nonlinear absorption at 532 nm in a cadmium texaphyrin solution has been studied using 8ns and 23ps laser pulses. The experiments show that reverse saturable absorption occurs in the nanosecond case. For picosecond pulses, RSA occurs only at low fluences, and saturable absorption occurs at high fluences. A six-level model is proposed to explain these nonlinear absorption effects. Several photophysical parameters of excited states for cadmium texaphyrin, such as absorption cross-sections at 532nm and lifetime, have been evaluated by fitting theoretical calculations with the experimental results.

STUDY ON LIGHT LOCALIZATION OF ONE-DIMENSIONAL DISORDERED MULTILAYER

HU WEI, ZHANG YOU-LONG, ZHANG DAO-ZHONG, LI ZHAO-LIN, CHENG BING-YING, YANG GUO-ZHEN
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 828-835 doi: 10.1088/1004-423X/3/11/005
Full Text: [PDF 240 KB] (Downloads:332)
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Antimonite and cryolite are used as the high and low refractive index coating materials to be evaporated alternately to the glass substrates. All cryolite layers have the same thickness d/4na, and the thickness of antimonite layers varies randomly around an average value d/4nb, with d=650nm, na and nb their refractive indices. Three kinds of multilayer are prepared, they possess the same degree of thickness disorder, but different total lengths, i.e., 10, 15 and 21 perioda. We measure the transmission and reflection spectrum after the light passing through these multilayers. The exponential intensity variation versus total length is experi-mentally demonstrated, and the light localization length is then obtained. Our experimental results can be fitted very well with the numerical simulation. Based on the measured and calculated localization length, the effects of phase coherent: Bragg reflection and Anderson localization are discussed.
ATOMIC AND MOLECULAR PHYSICS

SYSTEMATIC STUDY OF POLARIZATION OF TWO-PHOTON ABSORPTION IN SYMMETRY ASSIGNMENTS

LIU YAO-MING, LIN MEI-RONG, PAN XIAO-NING, ZHANG BAO-ZHENG, CHEN WEN-JU
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 801-808 doi: 10.1088/1004-423X/3/11/001
Full Text: [PDF 182 KB] (Downloads:404)
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In this paper, we have systematically analyzed the degenerate and nondegenerate two-photon polarization ratios of various point groups. We present the maximum of symmetry assignments of two-photon transition with the combination of degenerate and nondegenerate two-photon absorption. These results provide the theoretical basis for the experimental assignments.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

THE 2D LOCALIZED MODES OF BIPOLARON IN cis-POLYACETYLENE

LI ZHAN-JIE, AN ZHONG, YAO KAI-LUN
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 836-842 doi: 10.1088/1004-423X/3/11/006
Full Text: [PDF 160 KB] (Downloads:276)
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The localized vibrational modes around a bipolaron in cis-(CH)x are studied by using a two-dimensional extension of the SSH model that includes the bond-bending term. A number of additional modes have been found, compared with the results based on the standard SSH model The amplitudes of the two directions (x and y direction) are comparable for most of the modes as in the trans-(CH)x case. The number of localized modes and their frequencies depend not only on the coupling constant, but also on the bond-bending term and the parameter t1 in removing the degeneracy of the ground state.

ON THE SUPERCONDUCTING MECHANISM OF K3C60 AND Ba1-xKxBiO3

ZHANG LI-YUAN, ZHOU YUN-SONG, JIN GUANG-HAI
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 843-848 doi: 10.1088/1004-423X/3/11/007
Full Text: [PDF 182 KB] (Downloads:278)
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A superconducting mechanism for K3C60 and Ba1-xKxBiO3 has been suggested. This is the combining picture of the Cooper pair and the Ogg pair. Numerical calculations within the framework of this picture have been done for K3C60 and Ba1-xKxBiO3, and the overall consistency with the experimental data of superconducting properties is good.

THEORY OF OPTICAL WAVE COUPLING IN THE PRESENCE OF MAGNETOSTATIC SURFACE WAVES

WANG QI, WEN GUO-JUN, CAI YING-SHI
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 849-860 doi: 10.1088/1004-423X/3/11/008
Full Text: [PDF 279 KB] (Downloads:258)
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The general expression of magneto-optical permittivity tensor including the Faraday and Cotton-Mouton effects is derived and the coupled wave equations for the optical modes propagating in an arbitrary direction with respect to the magnetostatic surface wave are obtained. The optical multimode coupled wave equations will reduce to the bi-mode ones in the phase-matching conditions. The behaviors of four types of important optical bi-mode coupling are discussed and some new results are obtained. In the limits of α= 0 and π/2, all results obtained reduce to those reported in the literature.

CRYSTALLIZATION OF DIELECTRIC SPHERES IN LASER STANDING WAVE FIELD

CHENG BING-YING, HU WEI, YANG JUN-HUI, LI ZHAO-LIN, ZHANG DAO-ZHONG, YANG GUO-ZHEN
Acta Phys. Sin. (Overseas Edition), 1994, 3 (11): 861-869 doi: 10.1088/1004-423X/3/11/009
Full Text: [PDF 369 KB] (Downloads:358)
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Experimental study on crystallization of polystyrene spheres and SrTiO3 particles in laser standing wave field is presented. The diameter of polystyrene, which are able to be trapped, is 7 times smaller than that reported by Burns, the corresponding lattice constant is reduced to 1.5 μm. The crystallization effect of SrTiO3 particles with a refractive coastant of 2.5 in the visible range is observed for the first time. Based on the results above we believe that it is possible to construct photonic crystal with lattice constant extended to visible wave range by this method.
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