Tuning of Two-Dimensional Plasmon-Exciton Coupling in Full Parameter Space: A Polaritonic Non-Hermitian System

Yungang Sang, Chun Yuan Wang, Soniya S. Raja, Chang Wei Cheng, Chiao Tzu Huang, Chun An Chen, Xin Quan Zhang, Hyeyoung Ahn, Chih Kang Shih, Yi Hsien Lee, Jinwei Shi, Shangjr Gwo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Non-Hermitian photonic systems with gains and/or losses have recently emerged as a powerful approach for topology-protected optical transport and novel device applications. To date, most of these systems employ coupled optical systems of diffraction-limited dielectric waveguides or microcavities, which exchange energy spatially or temporally. Here, we introduce a diffraction-unlimited approach using a plasmon-exciton coupling (polariton) system with tunable plasmonic resonance (energy and line width) and coupling strength. By designing a chirped silver nanogroove cavity array and coupling a single tungsten disulfide monolayer with a large contrast in resonance line width, we show the tuning capability through energy level anticrossing and plasmon-exciton hybridization (line width crossover), as well as spontaneous symmetry breaking across the exceptional point at zero detuning. This two-dimensional hybrid material system can be applied as a scalable and integratable platform for non-Hermitian photonics, featuring seamless integration of two-dimensional materials, broadband tuning, and operation at room temperature.

Original languageEnglish
JournalNano letters
DOIs
StateAccepted/In press - 2021

Keywords

  • exciton
  • non-Hermitian system
  • Plasmon
  • polariton
  • two-dimensional material

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