In this talk we introduce an analytical microscopic model of EOT that only considers the SPP and neglect all other fields on the metal surface, so as to identify the pure contribution of SPP to EOT and to reconcile the previous debates on the role of SPP in EOT. Comparing the prediction of the pure-SPP model and the fully-vectorial calculations that automatically incorporate the total field on the metal surface, we find that the contribution of SPP to EOT gradually decreases as the wavelength increases from the visible to infrared, while the contribution from another residual quasi-cylindrical wave (QCW) gradually becomes dominant. By further incorporating the QCW, the model is then able to predict the EOT phenomenon over a broad spectrum range with a high accuracy, which enables an intuitive and efficient design of the relevant devices. The validity of the model is demonstrated by predicting the experimental data of the transmittance through subwavelength metallic hole arrays of various densities.

报告人简介:刘海涛，南开大学现代光学研究所教授，博士生导师。清华大学工学学士、光学工程博士，法国CNRS光学研究所博士后。研究方向为微纳米光学、表面等离激元光学。以第一作者或通讯作者发表SCI期刊论文21篇（包括1篇Nature），SCI他引272次，合作发表SCI期刊论文12篇（包括1篇Nature，2篇Physical Review Letters），SCI他引144次。在国际学术会议作特邀报告5次。主持973计划项目课题等7项国家级和省部级项目。入选教育部“新世纪优秀人才支持计划”、天津市“131”创新型人才培养工程第一层次人选（最高层次），获国家优秀青年科学基金项目资助。获得了法中科学及应用基金会Gilles Kahn奖，中国仪器仪表学会金国藩奖学金，两次获得中国光学学会王大珩光学奖（分别为高校学生奖和中青年科技人员光学奖）。