Phonon Polaritons in Monolayers of Hexagonal Boron Nitride

Siyuan Dai; Wenjing Fang; Nicholas Rivera; Yijing Stehle; Bor‐Yuan Jiang; Jialiang Shen; Roland Yingjie Tay; Christopher J. Ciccarino; Qiong Ma; Daniel Rodan‐Legrain; Pablo Jarillo‐Herrero; Edwin Hang Tong Teo; Michael M. Fogler; Prineha Narang; Jing Kong; Dimitri N. Basov

doi:10.1002/adma.201806603

journal article·2019-09Open access

Phonon Polaritons in Monolayers of Hexagonal Boron Nitride

Siyuan Dai, Wenjing Fang, Nicholas Rivera, Yijing Stehle, Bor‐Yuan Jiang, Jialiang Shen, Roland Yingjie Tay, Christopher J. Ciccarino, Qiong Ma, Daniel Rodan‐Legrain, Pablo Jarillo‐Herrero, Edwin Hang Tong Teo, Michael M. Fogler, Prineha Narang, Jing Kong, Dimitri N. Basov

Advanced Materials· Volume 31· Issue 37

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Abstract

Abstract Phonon polaritons in van der Waals materials reveal significant confinement accompanied with long propagation length: important virtues for tasks pertaining to the control of light and energy flow at the nanoscale. While previous studies of phonon polaritons have relied on relatively thick samples, here reported is the first observation of surface phonon polaritons in single atomic layers and bilayers of hexagonal boron nitride (hBN). Using antenna‐based near‐field microscopy, propagating surface phonon polaritons in mono‐ and bilayer hBN microcrystals are imaged. Phonon polaritons in monolayer hBN are confined in a volume about one million times smaller than the free‐space photons. Both the polariton dispersion and their wavelength–thickness scaling law are altered compared to those of hBN bulk counterparts. These changes are attributed to phonon hardening in monolayer‐thick crystals. The data reported here have bearing on applications of polaritons in metasurfaces and ultrathin optical elements.

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Research context

Nanomaterials

OpenAlex topics: Thermal Radiation and Cooling Technologies · Plasmonic and Surface Plasmon Research · Metamaterials and Metasurfaces Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Materials Research and Education Center Department of Mechanical Engineering Auburn University Auburn AL 36849 USA

Department of Electrical Engineering & Computer Sciences Massachusetts Institute of Technology Cambridge MA 02139 USA

John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA 02139 USA

Department of Physics Massachusetts Institute of Technology Cambridge MA 02139 USA

Sichuan University Pittsburgh Institute Sichuan University Sichuan Chengdu 610017 China

Department of Physics University of California, San Diego La Jolla CA 92093 USA

School of Electrical and Electronic Engineering Nanyang Technology University 50 Nanyang Avenue Singapore 639798 Singapore

Department of Physics Columbia University New York NY 10027 USA

Funding

U.S. Department of Energy · Basic Energy Sciences · Air Force Office of Scientific Research · Gordon and Betty Moore Foundation · National Science Foundation · Army Research Office

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