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Three-dimensional SiO2 photonic crystals (PhCs) are fabricated on quartz substrates by the vertical deposition method. Scanning electron microscopy measurement reveals that the samples exhibit an ordered close-packed arrangement of SiO2 spheres. It is found that the position of the [111] photonie band gap (PBG) shifts to a long wavelength (red shift) with increasing sphere size. Gap broadening effects are observed due to the presence of defects in the samples. Moreover, the optical properties of the PBG are very sensitive to the annealing temperature. Our results indicate that the optical properties of the PBG can be easily tuned in the visible region by appropriate experimental parameters, which will be useful for practical applications of PhC optical devices. 相似文献
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Controlled Evolution of Silicon Nanocone Arrays Induced by Ar+ Sputtering at Room Temperature 下载免费PDF全文
Controlled evolution of silicon nanocone arrays induced by Ar^+ sputtering at room temperature, using the coating carbon as a mask, is demonstrated. The investigation of scanning electron microscopy indicates that the morphology of silicon nanostructures can be controlled by adjusting the thickness of the coating carbon film. Increasing the thickness of the coating carbon film from 50-60 nm, 250-300 nm and 750-800 nm to 1500 nm, the morphologies of silicon nanostructures are transformed from smooth surface ripple, coarse surface ripple and surface ripple with densely distributed nanocones to nanocone arrays with a high density of about 1 × 10^9- 2 × 10^9 cm^-2. 相似文献
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可膨胀管(SET)工艺是国外开发的一项新技术,采用膨胀锥通过钢管就地膨胀,从而使钢管内径减小最少。于上世纪九十年代由皇家荷兰壳牌石油公司提出的技术设想,并且目前被广泛用于石油勘探作业中,对于是有挖掘与开采工业有巨大的应用价值。本文从可膨胀管技术原理分析为基础,研究其在目前相关领域的应用情况。 相似文献
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