Wei Dunzhao, Wu Yang, Wang Yongmei, Liu Dongmei, Zhu Yunzhi, Wei Dan, Zhang Yong, Xiao Min
Opt Express. 2016 May 30;24(11):12007-12. doi: 10.1364/OE.24.012007.
We report on the extraordinary optical transmission (EOT) of an orbital angular momentum (OAM) state of light in the paraxial approximation. The OAM state transmits through a subwavelength metal hole array with a square structure, and then is analyzed by using a Mach-Zehnder interferometer. In the experiment, the transmitted light well conserves the OAM information while the transmission efficiency of the OAM mode is much greater than 1 (i.e., EOT works). Further study shows that the OAM mode has no significant influence on the transmission spectrum of the EOT paraxial process under our experimental configuration. Our work can be useful for future plasmon-based OAM devices.
我们报道了傍轴近似下光的轨道角动量（OAM）态的超常光学传输（EOT）。OAM态通过具有方形结构的亚波长金属孔阵列传输，然后使用马赫-曾德尔干涉仪进行分析。在实验中，透射光很好地保留了OAM信息，而OAM模式的传输效率远大于1（即EOT起作用）。进一步的研究表明，在我们的实验配置下，OAM模式对EOT傍轴过程的传输光谱没有显著影响。我们的工作对未来基于表面等离激元的OAM器件可能有用。
