Tunable and scalable fabrication of plasmonic dimer arrays with sub-10 nm nanogaps by area-selective atomic layer deposition

被引:2
|
作者
Zhang, Chengwu [1 ,2 ]
Gao, Tuo [1 ,2 ]
Sheets, Donal [2 ,3 ]
Hancock, Jason N. [2 ,3 ]
Tresback, Jason [4 ]
Willis, Brian [1 ,2 ]
机构
[1] Univ Connecticut, Dept Chem & Biomol Engn, Storrs, CT 06269 USA
[2] Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA
[3] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA
[4] Harvard Univ, Ctr Nanoscale Syst, Cambridge, MA 02138 USA
来源
基金
美国国家科学基金会;
关键词
NANOPARTICLE ARRAYS; ELECTRODES; SEPARATION; ANTENNAS; PAIRS;
D O I
10.1116/6.0001205
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Nanogaps in metallic nanostructures produce local field enhancements with potential applications in surface enhanced spectroscopy, solar energy conversion, and photocatalysis. Atomic layer deposition is applied as a conformal coating to modify nanogap sizes and tune the optical properties of plasmonic dimer arrays with sub-10 nm nanogaps. Nanostructures are fabricated using layers of gold and palladium to combine features of plasmonics and area-selective atomic layer deposition, where copper metal is deposited on palladium-covered surfaces. Direct measurements of optical extinction for successive smaller nanogaps and thicker copper coatings show that spectral features become broadened at first due to heating-induced shape changes but subsequently sharpen as copper coatings form on palladium structures. Furthermore, longitudinal resonances of plasmonic dimers blue shift for thin coatings due to heating and decreasing aspect ratio, but thicker coatings lead to red shifts due to narrowing nanogaps. Together, these results show that area-selective atomic layer deposition is a promising tool for achieving large area arrays of plasmonic dimers with sub-10 nm nanogaps.
引用
收藏
页数:6
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