Journal
NANO LETTERS
Volume 21, Issue 6, Pages 2596-2602Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00198
Keywords
Plasmon; exciton; polariton; two-dimensional material; non-Hermitian system
Categories
Funding
- Ministry of Science and Technology in Taiwan [MOST-109-2123-M-007-001, MOST 107-2923-M-007-004-MY3]
- NSF of China [91950108, 11674032, 11774035]
- Yushan Scholar program of MOE in Taiwan
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The study introduces a diffraction-unlimited approach using tunable plasmonic resonance and coupling strength, which can be applied in non-Hermitian photonics with features like seamless integration of two-dimensional materials, broadband tuning, and operation at room temperature.
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.
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