High sensitivity biological sample measurement has been achieved by using a 10° tilted fiber Bragg grating sensing probe. Human acute leukemia cells with different intracellular densities were clearly discriminated by identifying their slight refraction index (RI) perturbations in the range from 1.3342 to 1.3344, combining with a temperature self-calibration property. We studied the relationship between the intracellular density of cells (S50 and S60) and their RIs, the experimental results provide a potential way to verify the hypothesis for "density alteration in non-physiological cells (DANCE)".
LIU FuGUO TuanLIU JianGuoZHU XiaoYangLIU YuGUAN BaiOuALBERT Jacques
The experimental optimization of a 10 GHz optoelectronic oscillator (OEO) based on a 1.55 μm directly modulated distributed feedback (DFB) laser is demonstrated in this paper. The phase noise of the directly modulated laser (DML) based OEO is significantly reduced by proper selection of the laser's bias current and by using a dispersion shifted fiber as a delay line. The phase noise performance of the DML OEO achieved after optimization is close to that of a conventional OEO constructed using a commercial DFB laser and a LiNbO 3 Mach-Zehnder modulator. The DML based OEO is most promising for future realization of a miniature OEO architecture with the components integrated on a semiconductor substrate.
WANG LiXianZHU NingHuaLIU JianGuoLI WeiZHU HongLiangWANG Wei
A selectable infiltrating large hollow core photonic band-gap fiber is fabricated with simple arc discharge technique. The offset, discharge duration, arc current and discharge times are optimized for selected sealing side air-holes but leave the central large air-hole partially open. The collapse length of the PCF is shortened by increasing the number of discharges and offset with discharge duration and arc current kept at a relatively low level. Light with the wavelength located at the photonic band-gap can still propagate while the central hollow air-hole is infiltrated with a kind of oil with refractive index of 1.30. The selectable infiltrating large hollow core photonic band-gap fiber has potential application for implementing novel lasers, sensors and tunable optoelectronic devices.
As an organic optical fiber with a diameter comparable to or less than the wavelength of light,polymer nanofibers have been attracting increasing attention as a platform for manipulating light at the nanoscale.A variety of applications for polymer optical nanofibers,including waveguides,light sources and sensors,have been reported in recent years.In this article,the recent progress in the field of polymer optical nanofibers is reviewed in terms of their fabrication,characterization and applications.In particular,we focus on functionalized polymer nanofibers doped with functional materials,such as dye molecules,noble metal nanoparticles,quantum dots and rare earth ions,which greatly expand their capabilities of generating,propagating,converting and modulating light at the nanoscale.
