Characterization of acceptance angles of small circular apertures.
Characterization of acceptance angles of small circular apertures.
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DOI：
10.1364/oe.17.023903
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发表时间：
2009-12
期刊：
影响因子：
3.8
通讯作者：
Ying Min Wang;G. Zheng;Changhuei Yang
中科院分区：
文献类型：
--
作者：
Ying Min Wang;G. Zheng;Changhuei Yang
我们通过模拟和实验测量来表征用于光收集的小圆孔的接收角。通过检查作为孔径尺寸的函数的全宽半最大接收角，我们表明，圆形孔径的接收角达到最小的67度，然后在单模和多模传输之间的过渡（约400 nm）周围反弹。这一现象可以用单模到多模传输过程中模式耦合效率的变化来解释。在理解光通过亚波长孔径的传输行为方面的这项工作将指导更好的基于孔径的成像设备的设计，其中孔径被用作光收集单元。
We characterize the acceptance angles of small circular apertures for light collection by simulations and experimental measurements. By examining the full width half maximum acceptance angle as a function of the aperture size, we show that the acceptance angle of a circular aperture reaches a minimum of 67 deg before rebounding around the transition between single mode and multimode transmission (approximately 400 nm). This behavior can be explained by the change of mode-coupling efficiency during the transition from single mode to multimode propagation regime. This work in understanding of the behavior of light transmission through subwavelength apertures will guide the design of better aperture based imaging devices where apertures are used as light collection units.