研究目的
Investigating the implementation and control of a tunable two-dimensional photonic crystal for surface plasmon polaritons using a graphene monolayer integrated in a back-gated platform with nano-structured gate insulators.
研究成果
The study demonstrates a broadly tunable two-dimensional photonic crystal for surface plasmon polaritons using a graphene monolayer. The platform allows for the formation of a photonic bandgap and strong modulation of the local plasmonic density of states, which can be controlled by the applied gate voltage. The implementation of an artificial domain wall supports highly confined one-dimensional plasmonic modes. This electrostatically-tunable photonic crystal paves the way for practical on-chip light manipulation.
研究不足
The performance of the devices at ambient temperature is not fully satisfactory due to decreased quality factor from electron-phonon interaction. The plasmonic damping rate limits the observed LDOS enhancement factor.
1：Experimental Design and Method Selection:
The study employs a graphene monolayer integrated in a back-gated platform with nano-structured gate insulators to create a tunable photonic crystal for surface plasmon polaritons (SPPs). Infrared nano-imaging is used to observe the formation of a photonic bandgap and modulation of the local plasmonic density of states.
2：Sample Selection and Data Sources:
The samples consist of a continuous graphene monolayer on a patterned SiO2 gate insulator layer. Data is acquired through near-field imaging techniques at cryogenic temperatures to minimize plasmonic losses.
3：List of Experimental Equipment and Materials:
A home-built scattering-type scanning near-field optical microscope (s-SNOM) coupled to a continuous-wave CO2 laser is used for imaging. The system operates in ultra-high vacuum and cryogenic temperatures.
4：Experimental Procedures and Operational Workflow:
The incoming laser beam is focused on an AFM tip, which acts as an optical antenna. The tip-scattered light is registered by a detector, and the near-field signal is extracted by a demodulation scheme. Images are taken at various gate voltages to observe the tunability of the photonic crystal.
5：Data Analysis Methods:
The near-field amplitude images are analyzed as maps of local electric field Ez, with simulations used to interpret the observed phenomena, such as the formation of a plasmonic bandgap and localized SPPs.
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