Van der Waals Phonon Polariton Microstructures for Configurable Infrared Electromagnetic Field Localizations

Wuchao Huang; Fengsheng Sun; Zebo Zheng; Thomas G. Folland; Xuexian Chen; Huizhen Liao; Ningsheng Xu; Joshua D. Caldwell; Huanjun Chen; Shaozhi Deng

doi:10.1002/advs.202004872

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Van der Waals Phonon Polariton Microstructures for Configurable Infrared Electromagnetic Field Localizations

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Van der Waals Phonon Polariton Microstructures for Configurable Infrared Electromagnetic Field Localizations

Wuchao Huang, Fengsheng Sun, Zebo Zheng, Thomas G. Folland, Xuexian Chen, Huizhen Liao, Ningsheng Xu, Joshua D. Caldwell, Huanjun Chen and Shaozhi Deng

Advanced science, Vol.8(13), pp.2004872-n/a

07/01/2021

DOI: 10.1002/advs.202004872

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Abstract

Polar van der Waals (vdW) crystals that support phonon polaritons have recently attracted much attention because they can confine infrared and terahertz (THz) light to deeply subwavelength dimensions, allowing for the guiding and manipulation of light at the nanoscale. The practical applications of these crystals in devices rely strongly on deterministic engineering of their spatially localized electromagnetic field distributions, which has remained challenging. The polariton interference can be enhanced and tailored by patterning the vdW crystal α‐MoO3 into microstructures that support highly in‐plane anisotropic phonon polaritons. The orientation of the polaritonic in‐plane isofrequency curve relative to the microstructure edges is a critical parameter governing the polariton interference, rendering the configuration of infrared electromagnetic field localizations by enabling the tuning of the microstructure size and shape and the excitation frequency. Thus, the study presents an effective rationale for engineering infrared light flow in planar photonic devices. By taking advantage of the in‐plane hyperbolic phonon polariton and spatial confinement effects, the nanoscale tailoring of mid‐infrared electromagnetic field localizations in van der Waals α‐MoO3 microstructures of different shapes and sizes is demonstrated. It is further shown that orientation of the in‐plane isofrequency curve relative to the microstructure edge is a critical parameter governing the localized electromagnetic field distributions.

electromagnetic field localizations

microstructures

nanoimaging

phonon polaritons

van der Waals crystals

Details

Title: Subtitle: Van der Waals Phonon Polariton Microstructures for Configurable Infrared Electromagnetic Field Localizations
Creators: Wuchao Huang - Sun Yat-sen University
Fengsheng Sun - Sun Yat-sen University
Zebo Zheng - Sun Yat-sen University
Thomas G. Folland - Vanderbilt University
Xuexian Chen - Sun Yat-sen University
Huizhen Liao - Sun Yat-sen University
Ningsheng Xu - Sun Yat-sen University
Joshua D. Caldwell - Vanderbilt University
Huanjun Chen - Sun Yat-sen University
Shaozhi Deng - Sun Yat-sen University
Resource Type: Journal article
Publication Details: Advanced science, Vol.8(13), pp.2004872-n/a
DOI: 10.1002/advs.202004872
ISSN: 2198-3844
eISSN: 2198-3844
Number of pages: 10
Grant note: National Natural Science Foundation of China (91963205; 11904420) National Science Foundation Division of Materials Research (1904793) Guangdong Basic and Applied Basic Research Foundation (2019A1515011355; 2020A1515011329) National Key Basic Research Program of China (2019YFA0210203) China Postdoctoral Science Foundation (2019M663199) Changjiang Young Scholar Program
Language: English
Date published: 07/01/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984428812502771

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