纳米孔隙聚合物光学薄膜透过率谱线的数值计算

用时域有限差分(FiniteDifferenceTimeDomain-FDTD)算法模拟了光从真空垂直入射到表面覆盖有一层纳米孔隙聚合物薄膜的玻璃介质,得到了在不同波长下的纳米孔隙薄膜的透过率谱线 将FDTD模拟结果的透过率谱线与理论谱线相对照,估算出了该薄膜的等效折射率 我们分别模拟了孔隙率为5%、10%、15%、20%和30%的薄膜,得到了它们的透过率谱线,而且利用这些谱线得到了它们不同的等效折射率值 文末给出了只有两层薄膜构成的纳米孔隙宽带增透薄膜的结构,而且利用FDTD算法模拟了光经过这种增透膜入射到玻璃介质的过程,结果显示这种增透膜在可见光波长范围的透过率高达99. 5%

用简化Mie理论及K—K关系求微粒复折射率的透射法

用简化的Mie散射理论及Kramers-Kronig关系式,从单频透射比光谱反演微粒的复折射率。用较大粒径的碳黑微粒作了模拟计算,结果表明本方法计算比较简单,比现有方法提高了精度,扩大了波长及粒径范围。最后利用红外分光光度计测出的透射比光谱确定了煤粒的复折射率。

磁光波导的折射率、吸收系数等参数的测量

本文提出用透射率谱测量波导的折射率、吸收系数等参数的测量方法，对其原理进行了分析，为测量和数据处理提供了理论依据．

Optical Path Length,Temperature,and Wavelength Effects Simulation on Ozone Gas Absorption Cross Sections towards Green Communications

Ozone is a green house gas. Ozone absorption cross sections have been reported with discrepancies and inconsistencies. In this paper, simultaneous effects of the optical path length and temperature variations on ozone gas absorption cross sections are investigated at different wavelengths. HITRAN 2012, the latest available line list on spectralcalc.com simulator, is used in this study to simulate ozone gas absorption cross sections in relation to the simultaneous effects of the optical path length and temperature at the wavelengths of 603 nm and 575 nm. Results obtained for gas cells with the optical path length from 10 cm to 120 cm show that the decrease in temperatures from 313 K to 103 K results in the increase in ozone gas absorption cross sections. At wavelengths of 603 nm and 575 nm, the percentage increase of ozone gas absorption cross sections is 1.22% and 0.71%, respectively. Results obtained in this study show that in the visible spectrum, at constant pressure, ozone gas absorption cross sections are dependent on the temperature and wavelength but do not depend on the optical path length. Analysis in this work addresses discrepancies in ozone gas absorption cross sections in relation to the temperature in the visible spectrum; thus, the results can be applied to get optimal configuration of high accuracy ozone gas sensors.

表面等离子体激元波导测量材料的折射率

利用表面等离子体激元不仅可以实现在纳米尺度上操控光子,而且为发展更加微型化、集成化的光波导等光学元器件提供了有利条件.如果表面等离子体激元波导金属薄膜一侧材料的折射率已知,那么利用表面等离子体激元的场增强效应就可以对另一侧材料的折射率进行高灵敏度的探测.作者利用Mathematica软件对表面等离子体激元波导如何测量衬底一侧材料的折射率进行了模拟,得到了物质折射率与模场分布和反射谱峰值之间的关系,为理解表面等离子体激元波导的测量机理提供了思路.

基于硅基微环谐振器的折射率传感研究综述

片上折射率传感在安全检查、环境监测、健康诊断和食品监督等领域有着广阔的应用前景,基于硅基微环谐振器的折射率传感器具有微型化、集成化等优点,已成为当前研究的热点。文章首先对硅基微环谐振器的折射率传感探测原理进行了介绍,然后依据探测原理分类梳理了国内外硅基微环折射率传感的最新研究进展,并分析总结了不同传感探测原理的优缺点,最后讨论了现阶段硅基微环谐振器在折射率传感中存在的问题和未来的发展方向。