Nanostructured GRIN microlenses for Gaussian beam focusing
Nanostructured GRIN microlenses for Gaussian beam focusing
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DOI：
10.1016/j.optcom.2009.12.047
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发表时间：
2010-05-01
影响因子：
2.4
通讯作者：
Taghizadeh, Mohammad R.
中科院分区：
文献类型：
--
作者：
Nowosielski, Jedrzej M.;Buczynski, Ryszard;Taghizadeh, Mohammad R.
研究了高斯光束通过具有任意折射率分布的高折射率对比度纳米结构折射率微透镜的传输。纳米结构梯度折射率微透镜的概念是基于有效介质理论，我们数值计算表明，使用FDTD方法，纳米结构梯度折射率微透镜可以聚焦高斯光束以相同的方式，以传统的梯度折射率微透镜，纳米结构梯度折射率微透镜的厚度减少了近两个数量级相比，传统的梯度折射率透镜。我们还调查了一个非常高的对比度的纳米结构梯度折射率微透镜的情况下，标准的标量和近轴梯度折射率理论的准确性。近轴GRIN透镜理论仅给出高斯光束在这种高对比度纳米结构GRIN微透镜中传播的近似描述。(C)2009爱思唯尔有限公司版权所有。
Gaussian beam propagation through a novel high refractive index contrast nanostructured Gradient-Index (GRIN) microlens with an arbitrary refractive index distribution is investigated. The concept of the nanostructured GRIN microlenses is based on the effective medium theory and we show numerically, using the FDTD method, that nanostructured GRIN microlenses can focus Gaussian beams in an identical manner to conventional GRIN microlenses, Nanostructured GRIN microlenses have a reduced thickness by almost two orders of magnitude compared to conventional GRIN lenses. We also investigate the accuracy of the standard scalar and paraxial GRIN theory in the case of a very high contrast nanostructured GRIN microlens. The paraxial GRIN lens theory is shown only to give an approximate description of Gaussian beam propagation in such a high contrast nanostructured GRIN microlens. (C) 2009 Elsevier B.V. All rights reserved.