Chemical switching of low-loss phonon polaritons in α-MoO3 by hydrogen intercalation

Yingjie Wu, Qingdong Ou, Yuefeng Yin, Yun Li, Weiliang Ma, Wenzhi Yu, Guanyu Liu (), Xiaoqiang Cui, Xiaozhi Bao, Jiahua Duan, Gonzalo Álvarez-Pérez, Zhigao Dai, Babar Shabbir, Nikhil Medhekar, Xiangping Li (), Chang-Ming Li, Pablo Alonso-González and Qiaoliang Bao ()
Additional contact information
Yingjie Wu: Monash University
Qingdong Ou: Monash University
Yuefeng Yin: Monash University
Yun Li: Monash University
Weiliang Ma: Chinese Academy of Sciences
Wenzhi Yu: Monash University
Guanyu Liu: Jinan University
Xiaoqiang Cui: Jilin University
Xiaozhi Bao: University of Macau
Jiahua Duan: Universidad de Oviedo
Gonzalo Álvarez-Pérez: Universidad de Oviedo
Zhigao Dai: Monash University
Babar Shabbir: Monash University
Nikhil Medhekar: Monash University
Xiangping Li: Jinan University
Chang-Ming Li: Qingdao University
Pablo Alonso-González: Universidad de Oviedo
Qiaoliang Bao: Monash University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Phonon polaritons (PhPs) have attracted significant interest in the nano-optics communities because of their nanoscale confinement and long lifetimes. Although PhP modification by changing the local dielectric environment has been reported, controlled manipulation of PhPs by direct modification of the polaritonic material itself has remained elusive. Here, chemical switching of PhPs in α-MoO3 is achieved by engineering the α-MoO3 crystal through hydrogen intercalation. The intercalation process is non-volatile and recoverable, allowing reversible switching of PhPs while maintaining the long lifetimes. Precise control of the intercalation parameters enables analysis of the intermediate states, in which the needle-like hydrogenated nanostructures functioning as in-plane antennas effectively reflect and launch PhPs and form well-aligned cavities. We further achieve spatially controlled switching of PhPs in selective regions, leading to in-plane heterostructures with various geometries. The intercalation strategy introduced here opens a relatively non-destructive avenue connecting infrared nanophotonics, reconfigurable flat metasurfaces and van der Waals crystals.

Date: 2020
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DOI: 10.1038/s41467-020-16459-3

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