Plasmon-Enhanced Second-Harmonic Generation Nanorulers with Ultrahigh Sensitivities

被引：102

作者：

Shen, Shaoxin ^{[1
]}

Meng, Lingyan ^{[1
]}

Zhang, Yuejiao ^{[2
,3
]}

Han, Junbo ^{[4
]}

Ma, Zongwei ^{[4
]}

Hu, Shu ^{[2
,3
]}

He, Yuhan ^{[2
,3
]}

Li, Jianfeng ^{[2
,3
]}

Ren, Bin ^{[2
,3
]}

Shih, Tien-Mo ^{[1
,5
]}

Wang, Zhaohui ^{[2
,3
]}

Yang, Zhilin ^{[1
]}

Tian, Zhongqun ^{[2
,3
]}

机构：

[1] Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China

[2] Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China

[3] Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China

[4] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China

[5] Univ Calif Davis, Inst Complex Adapt Matter, Davis, CA 95616 USA

来源：

NANO LETTERS | 2015年 / 15卷 / 10期

基金：

中国国家自然科学基金;

关键词：

plasmon nanoruler; second-harmonic generation; surface plasmon resonance; core-shell nanoparticles; finite-difference time-domain; GOLD; NANOPARTICLE; RULER; SPECTROSCOPY; RESONANCES; SCATTERING; QUANTUM; LIGHT;

D O I：

10.1021/acs.nanolett.5b02569

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Attainment of spatial resolutions far below diffraction limits by means of optical methods constitutes a challenging task. Here, we design nonlinear nanorulers that are capable of accomplishing approximately 1 nm resolutions by utilizing the mechanism of plasmon-enhanced second-harmonic generation (PESHG). Through introducing Au@SiO2 (core@shell) shell-isolated nanopartides, we strive to maneuver electric-field-related gap modes such that a reliable relationship between PESHG responses and gap sizes, represented by "PESHG nanoruler equation", can be obtained. Additionally validated by both experiments and simulations, we have transferred "hot spots" to the film-nanopartide-gap region, ensuring that retrieved PESHG emissions nearly exclusively originate from this region and are significantly amplified. The PESHG nanoruler can be potentially developed as an ultrasensitive optical method for measuring nanoscale distances with higher spectral accuracies and signal-to-noise ratios.

引用

页码：6716 / 6721

页数：6

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