Visible-Range Multiple-Channel Metal-Shell Rod-Shaped Narrowband Plasmonic Metamaterial Absorber for Refractive Index...

Area of Science:

• Nanophotonics
• Metamaterials
• Plasmonics

Background:

• Multiple resonance modes are crucial for nanophotonic devices but challenging to achieve in the visible spectrum.
• Existing plasmonic metamaterial absorbers (PMAs) face limitations in visible range sensitivity and tunability.

Purpose of the Study:

• To design and investigate a novel multiple-channel plasmonic metamaterial absorber (PMA) operating in the visible range.
• To evaluate the PMA's performance for sensitive refractive index (RI) and temperature sensing applications.

Main Methods:

• Utilized finite element method (FEM) simulations to analyze the absorber's optical properties.
• Investigated absorptance spectrum, magnetic flux, surface charge densities, electric field intensity, and electromagnetic power loss density.

Main Results:

• The proposed PMA exhibits tunable narrowband absorptance channels (three or five) in the visible range.
• Achieved high refractive index sensitivity (up to 600.00 nm/RIU) and figure of merit (FOM) (up to 120.00 RIU⁻¹).
• Demonstrated simultaneous temperature sensitivity of 0.22 nm/°C for multiple modes.

Conclusions:

• The designed PMA is suitable for highly sensitive refractive index and temperature sensing in the visible spectrum.
• The novel design overcomes challenges in achieving multiple resonance modes for nanophotonic devices.