Phonon Polariton-assisted Infrared Nanoimaging of Local Strain in Hexagonal Boron Nitride
- Shanghai Jiao Tong Univ. (China). Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- National Institute for Materials Science, Namiki, Tsukuba (Japan)
- Shanghai Jiao Tong Univ. (China). Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China); Shanghai Jiao Tong Univ. (China). Institute of Natural Sciences
- Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Div.; Univ. of California, Berkeley, and Lawrence Berkeley National Laboratory, CA (United States). Kavli Energy NanoSciences Inst.
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 ~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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1526580
- Journal Information:
- Nano Letters, Vol. 19, Issue 3; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Scaling and Reflection Behaviors of Polaritons in Low‐Dimensional Materials
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journal | September 2019 |
Probing Polaritons in 2D Materials with Synchrotron Infrared Nanospectroscopy
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journal | December 2019 |
Soliton superlattices in twisted hexagonal boron nitride
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journal | September 2019 |
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