Biomedical subjects

Shunquan Wang

Publications and source records attributed to Shunquan Wang.

4 recordsLinked to original sources

PubMed2006

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. Inductively coupled plasma-etching technology was used to fabricate the grating. The deep-etched high-density fused-silica transmission grating is suitable for use in a DWDM system because of its high efficiency, low polarization-dependent loss, parallel demultiplexing, and stable optical performance. The fabricated deep-etched high-density fused-silica transmission gratings should play an important role in DWDM systems.

Journal Article↗

PubMed2006

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=2.5) is verified through experiments with the scanning near-field optical microscopy technique, in which a He-Ne laser is used as its polarization is changed from the TE mode to the TM mode. The polarization-dependent Talbot effect should help us to understand more clearly the diffraction behavior of a high-density grating in nano-optics and contribute to wide application of the Talbot effect.

Journal Article↗

PubMed2005

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. Etch rate of fused silica is relatively high, and it demonstrates a linear relation between etched depth and working time. Results of the diffraction of gratings fabricated under the optimized etching condition match theoretical results well.

Journal Article↗

PubMed2002

[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 (157.7 +/- 9.0) mm Hg (SBP), (95.0 +/- 16.5) mm Hg (DBP) before entry to (130.6 +/- 11.0) mm Hg (SBP), (80.0 +/- 12.0) mm Hg (DBP), at the end of the study, with significant difference as compared with that of a control group (P < 0.001). The decrement was significant (P < 0.005). Patients' life style was changed and life quality improved. The rate of complications, disability and mortality declined in the study group five times than those in the control group. The total score of SCL-90 was significantly declined in the study group than control group. CONCLUSIONS: The beneficial effect of community and family intervention and health knowledge education was confirmed in this study. There is still a long way to go for popularizing public health education, training professional health personnel and enhancing the compliance of hypertensive patients to treatment.

Community Health Services↗