Tunable optical topological transitions of plasmon polaritons in WTe<sub>2</sub> van der Waals films

Yuangang Xie; Chong Wang; Fucong Fei; Yuqi Li; Qiaoxia Xing; Shenyang Huang; Yuchen Lei; Jiasheng Zhang; Lei Mu; Yaomin Dai; Fengqi Song; Hugen Yan

doi:10.1038/s41377-023-01244-w

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Tunable optical topological transitions of plasmon polaritons in WTe₂ van der Waals films

Original Articles

- Tunable optical topological transitions of plasmon polaritons in WTe₂ van der Waals films
- Light: Science & Applications Vol. 12, Issue 9, Pages: 1807-1817(2023)
- Affiliations：
  
  1.State Key Laboratory of Surface Physics, Key Laboratory of Micro and NanoPhotonic Structures (Ministry of Education), and Department of Physics, Fudan University, 200433 Shanghai, China
  2.Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, 100081 Beijing, China
  3.Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081 Beijing, China
  4.National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and College of Physics, Nanjing University, 210093 Nanjing, China
  5.Atom Manufacturing Institute (AMI), 211805 Nanjing, China
  6.Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 211805 Nanjing, China
- Author bio：
  
  Chong Wang (chongwang@bit.edu.cn)
  Fucong Fei (feifucong@nju.edu.cn)
  Hugen Yan (hgyan@fudan.edu.cn)
- Funds：
- DOI：10.1038/s41377-023-01244-w
  CLC：
- Published：30 September 2023，
  
  Published Online：09 August 2023，
  
  Received：01 April 2023，
  
  Revised：20 July 2023，
  
  Accepted：23 July 2023
- Accepted：
Scan QR Code
Xie, Y. G. et al. Tunable optical topological transitions of plasmon polaritons in WTe₂ van der Waals films. Light: Science & Applications, 12, 1807-1817 (2023).
DOI：

Xie, Y. G. et al. Tunable optical topological transitions of plasmon polaritons in WTe₂ van der Waals films. Light: Science & Applications, 12, 1807-1817 (2023). DOI： 10.1038/s41377-023-01244-w.

摘要

Abstract

Naturally existing in-plane hyperbolic polaritons and the associated optical topological transitions

which avoid th

e nano-structuring to achieve hyperbolicity

can outperform their counterparts in artificial metasurfaces. Such plasmon polaritons are rare

but experimentally revealed recently in WTe

van der Waals thin films. Different from phonon polaritons

hyperbolic plasmon polaritons originate from the interplay of free carrier Drude response and interband transitions

which promise good intrinsic tunability. However

tunable in-plane hyperbolic plasmon polariton and its optical topological transition of the isofrequency contours to the elliptic topology in a natural material have not been realized. Here we demonstrate the tuning of the optical topological transition through Mo doping and temperature. The optical topological transition energy is tuned over a wide range

with frequencies ranging from 429 cm

−1

(23.3 microns) for pure WTe

to 270 cm

−1

(37.0 microns) at the 50% Mo-doping level at 10 K. Moreover

the temperature-induced blueshift of the optical topological transition energy is also revealed

enabling active and reversible tuning. Surprisingly

the localized surface plasmon resonance in skew ribbons shows unusual polarization dependence

accurately manifesting its topology

which renders a reliable means to track the topology with far-field techniques. Our results open an avenue for reconfigurable photonic devices capable of plasmon polariton steering

such as canaling

focusing

and routing

and pave the way for low-symmetry plasmonic nanophotonics based on anisotropic natural materials.

关键词

Keywords

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Tunable optical topological transitions of plasmon polaritons in WTe2 van der Waals films

DOI：10.1038/s41377-023-01244-w

摘要

Abstract

关键词

Keywords

references

Tunable optical topological transitions of plasmon polaritons in WTe₂ van der Waals films