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采用有限时域差分方法模拟计算了在空气介质和水介质中条形天线的长度、厚度、宽度等几何参数以及入射光的偏振方向对光学天线红外特性的影响。光学天线在水中的响应波长相比空气介质中有明显红移，且空气中的一个响应峰在水中变为了两个；光学天线的长度直接影响其响应波长，两者呈现正比关系；天线的宽度在一定程度上影响了反射谱的半高宽,天线宽度每增加005μm，反射谱半高宽就增加01μm，天线的厚度在一定范围内对天线的红外特性影响较小；当天线的形状尺寸不变时，其入射光的偏振方向与天线长轴方向平行时，可以获得最大的增强。因此根据上述模拟计算的结果，可为设计探测海洋营养盐的高灵敏度红外光学天线打下一个夯实的理论基础。
Abstract：The infrared characteristics of optical antenna in water media was simulate using finite difference time domain (FDTD) method. The influence of geometrical parameters of the rectangular antenna and the polarized angle of incident light are obtained by calculating the infrared reflection spectra. The results showed that there were two peaks on the reflectance spectrum in water medium, while there is just one peak in the air medium. And the resonance wavelength becomes longer in water than that in air medium. Resonance wavelength increased with the increses of antenna length, and indicates linear relationship. Antenna width influenced FWHM of these spectrums. When antenna width increased 0-05μm, the FWHM increased 0-1μm. The effect of antenna height was very weak when the antenna length changed in a range. Keeping the shape of antenna, when the polarization direction of incident lignt parallel to the long axis, we can obtain the maximum enhancement. Based on these results, we designed an antennas to enhance the infrared absorption of marine nutrients.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20160084
引用信息:
[1]李章德1,陈靓1,孙鹏1，2,等.水对光学天线红外特性的影响研究[J],2016(增刊):2016, 46(增): 148-153.DOI:10.16441/j.cnki.hdxb.20160084.
基金信息:
国家自然科学基金项目（ 41476082,41076057）资助 Supported by National Natrual Science Foudation of China(41476082,41076057)