用共焦微透镜阵列量化超折射
Quantifying metarefraction with confocal lenslet arrays
摘要：
元体可以改变光的方向，其方式看起来与波动光学定律相违背，但实际上并不违背。这种方向改变仅适用于部分透射光束;其余部分以不同的方式重新定向。对于一个具体的例子，即在小透镜之间没有死区的矩形小透镜阵列的共焦对，我们在这里计算从特定（但任意）方向入射的以不同方式重新定向的均匀强度光束的功率的分数，并且我们导出描述这种重新定向的方程。这将有助于评估METATOY对太阳能集中等应用的适用性。最后，我们讨论了光在微透镜阵列上的多重光的折射和冷原子在光场存在下在势垒上的多重折射和反射之间的相似性。
英文摘要：
METATOYs can change the direction of light in ways that appear to, but do not actually, contravene the laws of wave optics. This direction change applies only to part of the transmitted light beam; the remainder gets re-directed differently. For a specific example, namely confocal pairs of rectangular lenslet arrays with no dead area between lenslets, we calculate here the fractions of power of a uniform-intensity light beam incident from a specific (but arbitrary) direction that get re-directed in different ways, and we derive an equation describing this redirection. This will facilitate assessment of the suitability of METATOYs for applications such as solar concentration. Finally, we discuss similarities between the multiple refraction of light at the lenslet arrays and multiple refraction and reflection of cold atoms at a barrier in the presence of the light fields.
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