Tailoring of spatial coherence in a multimode fiber by selectively exciting groups of eigenmodes.

Control of the properties of speckle patterns produced by mutual interference of light waves is important for various applications of multimode optical fibers. It has been shown previously that a high signal-to-noise ratio in a multimode fiber can be achieved by preferential excitation of lower order spatial eigenmodes in optical fiber communication. Here we demonstrate that signal spatial coherence can be tailored by changing relative contributions of the lower and higher order multimode fiber eigenmodes for the research of speckle formation and spatial coherence.

High-power low spatial coherence random fiber laser.

A high-power multi-transverse modes random fiber laser (RFL) is investigated by combining a master oscillator power-amplifier (MOPA) configuration with a segment of extra-large mode area step-index multimode fiber (MMF). Spatial coherence of the high-power multi-transverse modes RFL has been analyzed, which shows that speckle contrast is reduced dramatically with the output power increasing. In this way, considerably low speckle contrast of ~0.

Polaritonic manipulation based on the spin-selective optical Stark effect in the WS and Tamm plasmon hybrid structure.

Exciton-polaritons have shown great potential as a low-energy consumption and robust solid-state platform for photoelectronics integration and quantum information applications. Here, an all-optical method that uses the spin-sensitive optical Stark effect is proposed to manipulate exciton-polaritons for functional polaritonic operations. We use a Tamm plasmon and WS2 hybrid structure with a patterned transverse potential to form the channeled bright state of polaritons.

Decoherence of fiber supercontinuum light source for speckle-free imaging.

Speckle-free imaging is attractive in laser-illuminated imaging systems. The evolutionary process of supercontinuum decoherence in extra-large mode area step-index multimode fiber is analyzed to provide high-quality broadband light source for speckle-free imaging. It is found that spectral bandwidth, number of spatial transverse modes, and decoherence among different modes all greatly contribute to speckle reduction.

Biofilm Formation Plays a Role in the Formation of Multidrug-Resistant Toward Nutrients in Microcosm Experiments.

In this study, microcosms were established to determine the effect of nitrogen (N) and phosphorus (P) on the multidrug resistance and biofilm-forming abilities of . The expression of biofilm-formation-related genes was detected to establish correlations between genotype and phenotype. Different concentrations of N and P were added to make one control group and four treatment groups.

Targeting neuronal nitric oxide synthase by a cell penetrating peptide Tat-LK15/siRNA bioconjugate.

We developed a cell penetrating peptide (CPP) Tat-LK15, as a siRNA carrier to target nNOS. The feasibility, stability, efficiency and selectivity of this peptide-siRNA complex were evaluated in rat neuronal cells. We also compared the new method with conventional siRNA carrier Lipofectamine™.

[Effect and mechanism of miR-206/miR-613 on expression of OATP1B1].

This study was designed to explore the effect and mechanism of miR-206/miR-613 on the expression of OATP1B1 gene. Bioinformatic analysis was used to predict the potential miRNAs target sites in 3’-untranslated region (3’-UTR) of OATP1B1 mRNA. The expression level of miR-206/miR-613 and OATP1B1 mRNA and protein was determined with RT-qPCR and Western blot, respectively.

Fiber-Type Random Laser Based on a Cylindrical Waveguide with a Disordered Cladding Layer.

This letter reports a fiber-type random laser (RL) which is made from a capillary coated with a disordered layer at its internal surface and filled with a gain (laser dye) solution in the core region. This fiber-type optical structure, with the disordered layer providing randomly scattered light into the gain region and the cylindrical waveguide providing confinement of light, assists the formation of random lasing modes and enables a flexible and efficient way of making random lasers. We found that the RL is sensitive to laser dye concentration in the core region and there exists a fine exponential relationship between the lasing intensity and particle concentration in the gain solution.

Novel sensing concept based on optical Tamm plasmon.

This paper proposes a novel concept of refractive index sensing taking advantage of a high-refractive-index-contrast optical Tamm plasmon (OTP) structure, i.e., an air/dielectric alternate-layered distributed Bragg reflector (DBR) coated with metal.

All-optical bistable logic control based on coupled Tamm plasmons.

A method for realizing low-threshold all-optical bistable logic control is proposed based on Tamm plasmons (TPs), which are formed in an asymmetric dielectric Bragg reflector (DBR)-metal-DBR (ADMD) structure with a layer of Kerr medium embedded. The ADMD structure supports two TPs due to coupling of trapped modes at each metal-DBR interface, generating two dips in the structure's reflection spectrum. Thus, control (i.

Low threshold 2nd-order random lasing of a fiber laser with a half-opened cavity.

In this paper, we reported the realization of 2nd-order random lasing in a half-opened fiber cavity, which is formed by a FBG with central wavelength at the 1st-order Raman Stokes wavelength and a single-mode fiber (SMF) performing as a random distributed feedback mirror. Using this proposed method, the threshold of 1st-order (2nd-order) random lasing is reduced to 0.7 (2.

[Effects of hypoxia-inducible factor-1α on human gastric cancer cell apoptosis under in vitro CO(2) pneumoperitoneum environment].

Objective: To study the effect of hypoxia-inducible factor-1α (HIF-1α) on human gastric cancer cells apoptosis in simulated CO2 pneumoperitoneum environment.

Methods: Applied closed box to simulated CO2 pneumoperitoneum environment under the pressure of 0, 5, 10 and 15 mm Hg (1 mm Hg = 0.133 kPa).

[Effects of different CO2 pressure pneumoperitoneum on the migration and cytoskeleton in gastric cancer cells].

Objective: To investigate the influence of CO(2) and He insufflation administered at different pressures on the migration and cytoskeleton of cultured human gastric cancer cells.

Methods: The cultured gastric cancer cells MKN-45 were exposed to a CO(2) or He environment maintained at different pressures (12, 15 mm Hg). After 0, 2, 4, 6, 8 hours exposure to CO(2) or He environment, pH of the MKN-45 cells culture media was measured with blood gas analysis.

Light coupling between two parallel CO2-laser written long-period fiber gratings.

We demonstrate experimentally the light coupling effects between two parallel CO(2)-laser written long-period fiber gratings. For gratings written in standard single-mode fibers, the coupling efficiency depends strongly on the fiber orientation with the strongest coupling obtained when the exposed sides of the fibers face each other, while for gratings written in boron-doped fibers, the coupling efficiency is independent of the fiber orientation. We achieve a peak coupling efficiency of approximately 86% with gratings written in boron-doped fibers by using a suitable surrounding refractive index and offset distance between the two gratings.

[Inhibitive effects of gastric cancer cell-dendritic cell fusion vaccine on tumor cell proliferation cycle].

Objective: To study the inhibitive effects of gastric cancer cell-dendritic cell fusion vaccine on tumor cells of proliferation cycle.

Methods: Peripheral blood mononuclear cells were separated from gastric cancer patients and co-cultured with granulocyte macrophage colony stimulating factors(GM-CSF), interleukin-4(IL-4) and tumor necrosis factor-alpha(TNF-alpha) to generate mature dendritic cells. The dendritic cells and SGC7901 cells were fused by polyethylene glycol, and the pure fusion cells were screened out by selective culture systems.

Study on biological characters of SGC7901 gastric cancer cell-dendritic cell fusion vaccines.

Aim: To detect the biological characters of the SGC7901 gastric cancer cell-dendritic cell fusion vaccines.

Methods: The suspending living SGC7901 gastric cancer cells and dendritic cells were induced to be fusioned by polyethylene glycol. Pure fusion cells were obtained by selective culture with the HAT/HT culture systems.