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Gate-Tuning Hybrid Polaritons in Twisted α-MoO3/Graphene Heterostructures
Zhou Zhou1,2, Renkang Song1, Junbo Xu1
1MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
Nano Letters
|November 10, 2023
Summary
Researchers actively modulated hybrid plasmon-phonon polaritons (HPPPs) in α-MoO3/graphene by controlling graphene doping. This study reveals the mechanism behind gate-dependent modulation for advanced infrared nanophotonics.
Area of Science:
- Infrared Nanophotonics
- Condensed Matter Physics
- Materials Science
Background:
- Anisotropic phonon polaritons (PhPs) offer potential for infrared nanophotonics.
- Hybridization of PhPs with graphene has shown promise for dispersion engineering.
- The mechanism of gate-dependent modulation in these heterostructures remains unclear.
Purpose of the Study:
- To investigate the gate-dependent modulation of optical response in α-MoO3/graphene heterostructures.
- To elucidate the underlying mechanism of hybrid plasmon-phonon polaritons (HPPPs) modulation.
- To provide a foundation for active control in α-MoO3-based nanophotonics.
Main Methods:
- Infrared (IR) nanospectroscopic imaging was employed.
- Measurements focused on the gate dependence of wavelength, amplitude, and dissipation rate of HPPPs.
- Studies were conducted on both single-layer and twisted bilayer α-MoO3/graphene heterostructures.
Main Results:
- Active modulation of the optical response function of HPPPs was demonstrated.
- Graphene doping monotonically increased HPPP wavelength.
- HPPP amplitude and dissipation rate exhibited a transition from anticorrelated to correlated behavior with increasing graphene doping, attributed to complex momentum interplay.
Conclusions:
- The study clarifies the gate-dependent modulation mechanism of HPPPs in α-MoO3/graphene.
- The findings highlight the intricate interplay of gate-dependent momentum components.
- This work lays the groundwork for developing active, tunable α-MoO3 nanophotonics devices.
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