A Bidirectional “Y” Type OXC Structure Using the Least Optical Switches

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Optical Structure and Dynamic Aperture of the NICA Сollider

The optimized optical structure of the NICA collider is considered. Studies and calculation methods of the stability region of the motion of charged particles in the collider—the dynamic aperture—are presented. The influence of the magnetic-field nonlinearities, in particular, the fringe fields of the magnetic elements on the dynamic aperture, is considered. The dependences of the dynamic aperture on optical properties of the collider, the choice of the working point of betatron frequencies, and tuning parameters of the beam-interaction region are shown. The methods for compensating the effect of the fringe fields on the stability of beam dynamics are discussed.     

A New Possible Probe for Investigating the Exotic Structure of Neutron-Rich Nuclei by Using the Hanbury-Brown-Twiss Method

Hanbury-Brown-Twiss (HBT) results of the nucleon-nucleon correlation function have been presented for the nuclear reactions with neutron-rich projectiles using an event-generator, i.e. the isospin-dependent quantum molecular dynamics model. A good agreement of our calculation for the two-halo-neutron correlation function of     

Optical chirality of the double “L” structure

The optical chirality of the double “L” structures is investigated by the finite element method in this paper. The simulated results show that the double “L” structure has distinct chiral effect for the distance less than 300 nm. For the double “L” structure with the angle of 90°, the peak wavelength of the extinction coefficient for the left circular polarized light is larger than it for the right circular polarized light. The CD spectra are almost at the same wavelength for the distance 175–300 nm, while its wavelength increases with the decrease of the distance from 175 to 100 nm. Although the chiral effect of the double “L” structure for the angle 75° is similar with the structure for the angle 90°, the chiral effect of the structure with the angle 105° is opposite with the structure for the angle 75° and 90°.     

Structure—Depandent Electronic and Optical Properties of the Martensitic Alloys TiAu

The atomic and electronic structures together with the optical properties of TiAu in the low-temperature B19 and B11 phases are calculated by using first principles local density functional approaches.Our results show that the B11 structure is more stable than B19 for the TiAu alloy in ordered equiatomic composition (Ti:Au=50:50).At low temperatures,the B11 structure should exist as a binary alloy from the energetic consideration.The accurate atomic positions in the unit cell have been given by fully force relaxed calculations.The calculated optical conductivities of B19 and B11 phases show a drastic change in the region of 1.5 to 3.5eV.     

A Novel Optical Filter for Removing Bright-Background Using an Enhanced Bacteriorhodopsin Thin Film

We found that the bacteriorhodopsin (bR) film has a special property of complementary suppression modulated transmission (CSMT). The yellow and the blue beams can be suppressed mutually when both the beams illumlnate the bR film simultaneously. When the blue beam carrying an image with a bright-background noise illuminates on the bR film and then a yellow beam with uniform intensity distribution illuminates the same area, the bright-background can be removed due to the CSMT. In our demonstration, the pattern model is letters “VLSF” with ground noise of small words and the ground noise is removed from the pattern by the new optical filter.     

Spectroscopic Investigation of the Adsorption of Nitrophenol Isomers on Ammonium Zeolite of Type “Y”

In this study, nitrophenol isomers were adsorbed on synthetic ammonium Y zeolite and the samples acquired were examined with infrared spectroscopy and scanning electron microscopy. The aim of the work is to investigate whether isomeric effects can be monitored after adsorption process. Theoretical calculations of isomers had been performed and the data acquired show that adsorption occurred via bonding from the sites of zeolite.     

Measurement of the Third-Order Nonlinear Optical Coefficient of ZnO Crystals by Using ICCD-Z-Scan

We present an image-intensified charge-coupled-device (ICCD) version of Z-scan by employing an ICCD detector and fixing the sample at the beam waist, and a measurement of the third-order nonlinear optical coefficient of single crystal zinc oxide (ZnO). The X^(3) value of-9.1 x 10^-15 cm^2/W measured is in agreement with the published result. Our Z-scan configuration of placing sample at beam waist and collecting the whole wavefront by an ICCD detector is simple and can be deployed in cryogenic research where the sample cannot be Z-scanned.     

Chirality and Negative Refraction without Absorption in the Optical Domain Using Electromagnetically Induced Transparency

Nonclassical light beams generated by degenerate and non-degenerate optical parametric oscillators （OPO） have played a significant role in studies of squeezing, entanglement and other nonclassical properties of light. Fluctuation properties of these nonclassical light beams have been studied by using various coherent state representations of the field density matrix. Here we discuss the use of positive-P representation of the density matrix to map nonlinear quantum dynamics of an OPO onto c-number stochastic equations. Insights gained from these equations eventually lead to analytical expressions for positive-P function both for the degenerate and nondegenerate OPOs. Using these distributions we derive simple analytic expressions for various experimentally measurable quantities such as mean light intensity, intensity variance, squeezing, and photon counting distributions. Each of these quantity is described by a single unified analytical expression valid below, near and above threshold. We investigate how these properties are transformed near threshold as the oscillator makes a transition from below to above threshold. The results for the OPOs are compared with those for the single-mode and two-mode lasers and their similarities and differences are discussed.     

A Study of the Charm-Baryonic Structure from ㄚ Decays

In the framework of perturbative QCD,the exclusive decays $\Upsilon\to B\bar B$(B:baryon) are studied.With the constituent quark model describing the charm-baryonic structure, we calculate the decay widths for $\Upsilon\to p\bar p,\Lambda_c\bar \Lambda_c,\Sigma_c\bar \Sigma_c,\Xi_c\bar \Xi_c,\Xi_{cc}^+\Xi_{cc}^-,\occc\bar \occc $ , and discuss the prospect to search for the charm baryon $\occc$ in $\Upsilon$ decays.     

Using the “Sura” facility antenna for increasing the effective ionosonde power

We developed and tested a new method for increasing the effective ionosonde power by 20–40 dB, which uses the transceiving antenna of the “Sura” facility. Three sections of this antenna were employed as the receiving antenna of the ionosonde in the test experiments of July 2007. Fine features indiscernible in normal ionosonde mode are distinctly seen in the ionograms. Different variants of connection of the “Sura” antenna sections to the receiver and transmitter of the ionosonde are considered and the possibility of simultaneous operation of the “Sura” high-power transmitter and the ionosonde is analyzed. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 51, No. 10, pp. 830–836, October 2008.     

Possibility of Using the Effect of Radio‐Optical Resonance for Spectral Analysis of Radio Signals

The absorption spectrum of optically oriented Cs atoms which is induced by a train of radiofrequency pulses is compared to the spectral components of the radio field. Possibilities of using the results obtained in the development of widerange microwave spectrum analyzers of high resolution are indicated.     

Optical Security System Based on the Biometrics Using Holographic Storage Technique with a Simple Data Format

We implement a first practical holographic security system using electrical biometrics that combines optical encryption and digital holographic memory technologies. Optical information for identification includes a picture of face, a name, and a fingerprint, which has been spatially multiplexed by random phase mask used for a decryption key. For decryption in our biometric security system, a bit-error-detection method that compares the digital bit of live fingerprint with of fingerprint information extracted from hologram is used.     

“Global” and “Local” Approaches to the Theory of Open Quantum Optical Systems

Journal of Experimental and Theoretical Physics - The application of “exact/complete” initial Hamiltonian of an open optical system and its surroundings and “approximate”...     

Electronic Structures of the Filled Tetrahedral Semiconductor LiMgN with a Zincblende—Type Structure

An ab initio method with mixed-basis norm-conserving non-local pseudo-potentials has been employed to investigate the electronic structures of LiMgN.The band structure ,electronic density of states and charge density contour plot of LiMgN are also presented.By the calculation,we have found that LiMgN with a zincblende-type structure was an indirect gap semiconductor,and the value of indirect(Γ-X) energy band gap under the local density approximation was 2.97eV.In addition,the strong covalent charcter for Li-N and Mg-N has also been found in LiMgN.     

Optical and Photoluminescent Properties of Thin-Film ZnO–PLZT Structure in the UV and Visible Spectral Regions

Optics and Spectroscopy - The structural, optical, and photoluminescent properties of the thin-film structure ZnO–PLZT ferroelectric ceramics are studied. The results of X-ray diffraction...     

In-Plane Thermal Diffusivity Measurement of Thin Films Based on the Alternating-Current Calorimetric Method Using an Optical Reflectivity Technique

An advanced ac calorimetric method to measure thermal diffusivity of a thin sample is developed by using an optical reflectivity technique. A modulated infrared laser is used to heat the front surface of a foil specimen. The reflectivity of a continuous-wave He-Ne laser at the rear surface of the specimen is detected by a photoreceiver.