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Multipole resonance and Vernier effect in compact and flexible plasmonic structures
Yeonsoo Lim1, Soo-Chan An1, Hoon Yeub Jeong1
1Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.
Scientific Reports
|November 25, 2021
Summary
Researchers created flexible spoof surface plasmon resonators using metal-ink printing. These compact devices show stable microwave resonances under bending and enable spectral filtering and refractive index sensing.
Area of Science:
- Plasmonics and Photonics
- Microwave Engineering
- Materials Science
Background:
- Spoof surface plasmons (SSPs) on corrugated metal surfaces offer strong field confinement at low frequencies, crucial for compact microwave photonic devices.
- Existing technologies often lack flexibility and miniaturization capabilities for advanced microwave applications.
Purpose of the Study:
- To develop and characterize compact spoof plasmon resonators using metal-ink printing on flexible substrates.
- To investigate the performance of these resonators under mechanical stress (bending).
- To demonstrate spectral filtering and refractive index sensing functionalities.
Main Methods:
- Fabrication of spoof plasmon resonators using metal-ink printing on flexible substrates.
- Experimental observation and analysis of multipole resonances in the microwave frequency range.
- Investigation of resonance behavior under substrate bending.
- Implementation of Vernier effect-based spectral filtering by coupling two resonators of slightly different sizes.
- Characterization of refractive index sensing capabilities by analyzing resonance amplitude and frequency shifts.
Main Results:
- Successfully constructed compact spoof plasmon resonators using a flexible metal-ink printing technique.
- Observed stable multipole resonances in the microwave frequencies, maintained even under significant bending.
- Demonstrated spectral filtering using the Vernier effect by selectively addressing higher-order resonances.
- Showcased refractive index sensing capabilities, with tunable resonance amplitude and frequency based on resonator overlap.
Conclusions:
- Metal-ink printed flexible spoof plasmonic structures are viable for compact microwave photonic devices.
- The demonstrated resonators exhibit robustness to bending and offer tunable functionalities for spectral filtering and sensing.
- This technology holds promise for developing highly functional, flexible photonic elements for tight field confinement and manipulation.
