Phonon Polariton-assisted Infrared Nanoimaging of Local Strain in Hexagonal Boron Nitride

被引：62

作者：

Lyu, Bosai ^{[1
,2
]}

Li, Hongyuan ^{[1
,2
]}

Jiang, Lili ^{[3
]}

Shan, Wanfei ^{[1
,2
]}

Hu, Cheng ^{[1
,2
]}

Deng, Aolin ^{[1
,2
]}

Ying, Zhe ^{[1
,2
]}

Wang, Lele ^{[1
,2
]}

Zhang, Yiran ^{[1
,2
]}

Bechtel, Hans A. ^{[4
]}

Martin, Michael C. ^{[4
]}

Taniguchi, Takashi ^{[5
]}

Watanabe, Kenji ^{[5
]}

Luo, Weidong ^{[1
,2
,6
]}

Wang, Feng ^{[3
,7
,8
,9
]}

Shi, Zhiwen ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ, Shanghai 200240, Peoples R China

[2] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Lawrence Berkeley Natl Lab, Adv Light Source Div, Berkeley, CA USA

[5] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[6] Shanghai Jiao Tong Univ, Inst Nat Sci, Shanghai 200240, Peoples R China

[7] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

[8] Univ Calif Berkeley, Kavli Energy NanoSci Inst, Berkeley, CA 94720 USA

[9] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2019年 / 19卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Local strain; 2D materials; infrared nanoscopy; phonon polaritons; GRAPHENE; PLASMON;

D O I：

10.1021/acs.nanolett.8b05166

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Strain plays an important role in condensed matter physics and materials science because it can strongly modify the mechanical, electrical, and optical properties of a material and even induce a structural phase transition. Strain effects are especially interesting in atomically thin two-dimensional (2D) materials, where unusually large strain can be achieved without breaking them. Measuring the strain distribution in 2D materials at the nanometer scale is therefore greatly important but is extremely challenging experimentally. Here, we use near-field infrared nanoscopy to demonstrate phonon polariton-assisted mapping and quantitative analysis of strain in atomically thin polar crystals of hexagonal boron nitride (hBN) at the nanoscale. A local strain as low as 0.01% can be detected using this method with similar to 20 nm spatial resolution. Such ultrasensitive nanoscale strain imaging and analysis technique opens up opportunities for exploring unique local strain structures and strain-related physics in 2D materials. In addition, experimental evidence for local strain-induced phonon polariton reflection is also provided, which offers a new approach to manipulate light at deep subwavelength scales for nanophotonic devices.

引用

页码：1982 / 1989

页数：8

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