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Ultra sub-wavelength surface plasmon confinement using air-gap, sub-wavelength ring resonator arrays
Jaehak Lee1, Sangkeun Sung2, Jun-Hyuk Choi2
1Korea Advanced Institute of Science and Technology, Department of Physics, 373-1 Guseong-dong, Yuseong-Gu, Daejeon, South Korea.
Scientific Reports
|March 1, 2016
Summary
Sub-wavelength plasmonic ring resonators achieve ultra-small mode volumes for enhanced biosensing. This enables dramatic sensitivity improvements, detecting molecules like bovine serum albumin (BSA) with high precision.
Area of Science:
- Plasmonics
- Nanophotonics
- Biosensing
Background:
- Plasmonic ring resonators offer potential for highly sensitive biosensing applications.
- Achieving strong light-matter interaction requires precise control over resonator dimensions and optical modes.
Purpose of the Study:
- To fabricate sub-wavelength air-gap plasmonic ring resonators with reduced mode volumes.
- To demonstrate the enhanced biosensing capabilities of these resonators.
Main Methods:
- Fabrication of sub-10 nm air-gap plasmonic ring resonators using nanoimprinting.
- Excitation and characterization of the dipole mode in the near-infrared (NIR) range via transmission measurements.
- Demonstration of biosensing using bovine serum albumin (BSA) molecules.
Main Results:
- Successfully reduced the mode volume to 1.3 × 10⁻⁵ λ₀³ through lateral and vertical confinement.
- Achieved a dramatic enhancement in surface sensitivity up to 69 nm/nm for BSA detection.
- Demonstrated the correlation between modal height and sensitivity for adsorbed molecule layers.
Conclusions:
- Sub-wavelength plasmonic ring resonators with confined modes are effective for high-sensitivity biosensing.
- Nanoimprinting enables precise fabrication of these advanced plasmonic devices.
- The demonstrated sensitivity opens avenues for label-free biosensing of biological molecules.
