Polarizing beam splitter of a deep-etched fused-silica grating.

We described a highly efficient polarizing beam splitter (PBS) of a deep-etched binary-phase fused-silica grating, where TE- and TM-polarized waves are mainly diffracted in the -1st and 0th orders, respectively. To achieve a high extinction ratio and diffraction efficiency, the grating depth and period are optimized by using rigorous coupled-wave analysis, which can be well explained based on the modal method with effective indices of the modes for TE/TM polarization. Holographic recording technology and inductively coupled plasma etching are employed to fabricate the fused-silica PBS grating.

Polarization-dependent Talbot effect.

The term "polarization-dependent Talbot effect" means that the Talbot self-imaging intensity of a high-density grating is different for TE and TM polarization modes. Numerical simulations with the finite-difference time-domain method show that the polarization dependence of the Talbot images is obvious for gratings with period d between 2 lambda and 3 lambda. Such a polarization-dependent difference for TE and TM polarization of a high-density grating of 630 lines/mm (corresponding to d/lambda=2.

Deep-etched high-density fused-silica transmission gratings with high efficiency at a wavelength of 1550 nm.

We describe the design, fabrication, and excellent performance of an optimized deep-etched high-density fused-silica transmission grating for use in dense wavelength division multiplexing (DWDM) systems. The fabricated optimized transmission grating exhibits an efficiency of 87.1% at a wavelength of 1550 nm.

Optimized condition for etching fused-silica phase gratings with inductively coupled plasma technology.

Polymer deposition is a serious problem associated with the etching of fused silica by use of inductively coupled plasma (ICP) technology, and it usually prevents further etching. We report an optimized etching condition under which no polymer deposition will occur for etching fused silica with ICP technology. Under the optimized etching condition, surfaces of the fabricated fused silica gratings are smooth and clean.

[A community-based prospective control study of comprehensive intervention in hypertensive patients].

Objective: To explore the effect of comprehensive intervention and the prognosis of hypertensive patients in a community.

Methods: To monitor and follow up the hypertencive patients in a community and their families, to intervene comprehensively and prospectively and to make comparison with a control group.

Results: The blood pressure of the study group declined from (157.