Graphene Plasmon Resonances for Electrically-Tunable Sub-Femtometer Dimensional Resolution

Area of Science:

• Plasmonics
• Nanotechnology
• Materials Science

Background:

• Localized surface plasmon resonances (LSPRs) are crucial for nanoscale optical phenomena.
• Graphene's unique electronic properties offer tunable optical responses.
• Achieving sub-femtometer dimensional resolution is a significant challenge in metrology.

Purpose of the Study:

• To propose and investigate a coupled graphene structure (CGS) for achieving electrically tunable sub-femtometer dimensional resolution.
• To explore the potential of LSPRs in graphene-based structures for high-precision sensing.
• To demonstrate electrical tunability of measurement resolution and spectral properties.

Main Methods:

• Analytical and numerical investigations of the CGS.
• Modeling of localized surface plasmon resonances (LSPRs) within the dielectric spacer.
• Simulation of electrical tuning via gate voltage to modify graphene's chemical potential.
• Exploration of multi-graphene ribbon configurations for resonant frequency comb generation.

Main Results:

• The CGS supports two branches of LSPRs with significantly higher coupling efficiency for odd-order modes.
• Sub-femtometer resolution for detecting spacer thickness changes is achievable using the lowest order LSPR mode.
• LSPR wavelength and dimensional resolution are electrically tunable from 9.5 to 33 μm and 4.3 to 15 nm/pm, respectively.
• A resonant frequency comb with tunable intervals was generated using multiple graphene ribbons, enabling multi-location sensing.

Conclusions:

• The proposed CGS offers a promising platform for ultra-precise dimensional metrology with electrical tunability.
• The study demonstrates the feasibility of achieving sub-femtometer resolution for spacer thickness detection.
• The tunable resonant frequency comb opens possibilities for advanced sensing applications at the nanoscale.