光学异常透射研究进展

Progress in extraordinary optical transmission

光学异常透射(extraordinary optical transmission,EOT)现象于1998年首次报道,表现为当光通过亚波长金属孔阵列时,得到的透射率在特定波长位置会比经典的小孔透射理论预言的数值高若干个数量级。该现象首次显示了金属亚波长结构中表面波引起的异常光学效应,是表面等离激元光学(plasmonics)进入活跃发展期的一个标志性事件。本文将从产生机理和相关器件应用两方面,对EOT的研究进展进行简要阐述。首先介绍EOT产生机理的宏观Bloch模式解释和微观表面波解释,以及这两种解释的最终统一;然后介绍EOT在传感、纳米偏光器、滤波、光开关和分子光谱增强等领域的应用;最后是对EOT相关研究的展望。

Extraordinary optical transmission （EOT）, first reported in 1998, refers to the severM orders of magnitude enhanced transmission at specific wavelengths with respect to the classical theory pre- dictions, when a beam of light passes through an array of metallic subwavelength holes. This discovery demonstrated as the first time the surface waves induced abnormal optical effects in metallic subwavelength structures. It represented a milestone of plasmonics as an emergent dis- cipline. This mini-review outlines the progress of EOT by addressing the underlying physics and devices application potentials. First, the macroscopic Bloch-mode scenario and the microscopic surface-wave approach as two possible explanations for the EOT phenomena, as well the relation- ship between the two explanations, will be presented. Second, the EOT effects based promised applications in sensing, nano-polarizes, filters, optical switching, and spectra enhancements, will be highlighted. Finally, possible challenges and perspectives of the EOT relevant studies will be given.