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This paper proposes a method of fast 3D imaging using modulation analysisi. Two orthogonal gratings through a beam splitter are vertically projected on an object surface, and the tested object is placed between the imaging planes of the two gratings. Then the image of the object surface modulated by the orthogonal gratings can be obtained by a CCD camera from the same direction. The image is processed...
Methods of calculation of optical absorption and emission spectra for Au8 cluster has been suggested and corresponding calculations has been carried out. It has been shown that the best agreement with experiment is observed in case of planar C2v hexagon+1 shaped structure. The comparison of calculated absorption and emission spectra reveals that Stokes shift is small (about 11.5 nm) which agrees well...
In this paper, transient gain response in Raman fiber amplifiers (RFA) was simulated in details using an accurate dynamic numerical model. Firstly, bi-directionally pumped RFAs were designed for 80nm gain bandwidth, and less than 0.6 dB flatness of both gain and OSNR were derived by optimizing pump wavelengths and pump powers. When 50 channels were dropped from total 100 channels, Raman gain fluctuations...
This paper introduces a LabVIEW based high precision motion control system for the development of a fluorescence ultra-fast continuous flow rapid mixing device. Solutions inside two syringes were co-injected by step-motor controlled syringe plunger movements into a micro-fluid mixer where the mixing process stars. The step motors were controlled by a NI 7344 motion controller programmed by the LabVIEW...
The content of trace element in the tea from the different producing area was measured by using the Inductively Coupled Plasma spectrum (ICP). The distributive rule of trace element and the relativity of different trace element content is studied. The results shows that: (1)the content of certain trace element (B, Cu, Fe, Zn, Mn, etc.) in the different producing area tea change obviously, but the...
In this paper, we introduce a concept of spherical Photonic Crystal (SPhC) cavity. The structure is composed of a serial of concentric spherical shells with periodic refractive index. A complete three dimension photonic band gap can be obtained due to the spherical symmetry it owns. Such a cavity has a strong ability to confine light and energy. Optical quality factor of our structure can achieve...
By the product of magnetostriction and stress-birefringence, the laminate composites that can show Voigt effect was suggested and fabricated. Under a magnetic field no stronger than 1900 Oe, a phase difference of about 3.3π was observed for a trilayer composite Tb1-xDyxFe2-y / polycarbonate / Tb1-xDyxFe2-y with the polycarbonate layer in size of 5×2.75×20 mm3 at room temperature, resulting in a half-wave...
The relative gain intensity and corresponding permitted parametric of optical parametric oscillator based on periodically poled RbTiOAsO4 (PPRTA) have been analyzed and simulated. The permitted grating period of PPRTA was compared with those of periodically poled lithium niobate (PPLN) and periodically poled potassium titanyl phosphate (PPKTP).
On the basis of the variational approach, this paper examines the dynamics of a pulse in fibers with periodic dispersion and nonlinearity. With this approach, a set of couple different equations for the evolution of the pulse width and chirp are obtained. We annalyse the propagation of dispersion and nonlinearity-managed solitons. The result demonstrates that compared with only dispersion management,...
Luminescence properties of the oxidized Si-rich SiNx films prepared at low temperature were investigated. Strong photoluminescence from the samples can be observed at room temperature. The spectral profile exhibits some obviously modulated features upon the excited wavelength. By employing the oxidized Si-rich SiNx films as the luminescent active layers, the devices with low turn-on voltage have also...
Phototherapy has attracted increasing attention in recent years because numerous applications and controlled studies on the method have been reported. According to these reports, low-level red light irradiation can lead to celluar proliferation and enhance cell differentiation. The purpose of this in vitro study is to investigate the influence of red light from a light-emitting diode (LED) on rat...
Terahertz time-domain spectroscopy is a newly developed technique, which can provide a direct fingerprint spectroscopy of the molecular structure or conformational state of a compound. The relationship between the optical activity of some amino acids and their THz spectroscopy is presented. Based on their THz spectroscopy these amino acids are precisely clustered into three kinds: L-s D-s and DL-s...
A supermagnetic iron oxide (SPIO) microspheres is emerging as an ideal tool for cell tracking and drug targeting delivery. However, its low intracellular labeling efficiency has limited the potential usage. We have developed CdTe-incorporated CMCH/SiO2-coated core-shell composite microspheres, Fe3O4@SiO2@CMCH/CdTe (FSCC), with diameters of 210 nm, as a multifunctional magnetic vector that can efficiently...
An autostereoscopic three dimensional display composed of a flat panel display and two parallax barriers is given. Parallax barrier 1 facing the backlight acts as the function of the parallax barriers in ordinary autostereoscopic three dimensional displays, and parallax barrier 2 facing viewers acts as the function of decreasing the crosstalk of stereoscopic images. The operation principle of the...
A novel fiber Bragg grating (FBG) tilt sensor is proposed to detect the magnitude as well as the direction of a two-dimensional inclination by using four FBGs. High angle sensitivity and measurement resolution has been achieved and the temperature effect has been eliminated completely without additional temperature compensation schemes. Experimental results verified the feasibility of the proposed...
A novel all-optical sampling based on nonlinear polarization rotation in a semiconductor optical amplifier is presented. An analog optical signal and an optical pulses train are injected into semiconductor optical amplifier simultaneously, and the analog light modulates the output optical pulse through controlling the rotated angle of nonlinear polarization rotation of the optical pulse. Therefore,...
This paper proposes a method called Jump method for optimization of optical thin films. The method is a kind of hybrid approach. It is the combination of local search strategy using modified Coordinate-Wise Algorithm and global search strategy using modified Evolutionary Algorithm. Jump method was successfully applied to the design of a dielectric beam splitter. The result indicates that Jump method...
We proposed the coupling and competition of second harmonic generation (SHG) and acousto-optic (AO) interaction in periodically poled lithium niobate (PPLN). The reciprocal vector of PPLN compensates the SHG wave-vector mismatch when quasi-phase-matching (QPM) condition is satisfied, while phonons with suitable frequencies may affect it by scattering photons to different polarization state. Second...
The structural characteristics, deposition rate, absorption spectra and optical band gap of the silicon-germanium thin films, which were prepared by RF-PECVD, had been researched under the diffferent Germane's concentration. By test of Raman, all the silicon-germanium thin films presented amorphous and the spectral peaks were located around 480cm-1. According to the trend of optical band gap, the...
A wavelength selective optical isolator is proposed. Being different from conventional isolators, a well-designed wave plate is employed and works together with the Faraday rotator. Different wavelengths thus experiences different phase retardation so that wavelength-dependant polarization states are obtained for bidirectional beams. A (1.49 μm, 1.31 μm) wavelength selective isolator is demonstrated,...
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