Experimental verification of the rainbow trapping effect in adiabatic plasmonic gratings

被引:132
作者
Gan, Qiaoqiang [1 ,2 ]
Gao, Yongkang [1 ]
Wagner, Kyle [3 ]
Vezenov, Dmitri [3 ]
Ding, Yujie J. [1 ]
Bartoli, Filbert J. [1 ]
机构
[1] Lehigh Univ, Ctr Opt Technol, Elect & Comp Engn Dept, Bethlehem, PA 18015 USA
[2] SUNY Buffalo, Elect Engn Dept, Buffalo, NY 14260 USA
[3] Lehigh Univ, Dept Chem, Bethlehem, PA 18015 USA
基金
美国国家科学基金会;
关键词
slow light; surface dispersion engineering; surface plasmons; MODES; INDEX; LIGHT;
D O I
10.1073/pnas.1014963108
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We report the experimental observation of a trapped rainbow in adiabatically graded metallic gratings, designed to validate theoretical predictions for this unique plasmonic structure. One-dimensional graded nanogratings were fabricated and their surface dispersion properties tailored by varying the grating groove depth, whose dimensions were confirmed by atomic force microscopy. Tunable plasmonic bandgaps were observed experimentally, and direct optical measurements on graded grating structures show that light of different wavelengths in the 500-700-nm region is "trapped" at different positions along the grating, consistent with computer simulations, thus verifying the "rainbow" trapping effect.
引用
收藏
页码:5169 / 5173
页数:5
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