Spoof localized surface plasmons in corrugated ring structures excited by microstrip line.

Area of Science:

• Electromagnetics and Plasmonics
• Microwave Engineering
• Metamaterials

Background:

• Spoof localized surface plasmons (LSPs) offer unique electromagnetic properties at subwavelength scales.
• Controlling LSP modes is crucial for designing advanced resonant structures.
• Textured surfaces enable the manipulation of electromagnetic waves at microwave frequencies.

Purpose of the Study:

• To investigate fundamental and high-order spoof LSPs in a corrugated ring resonator.
• To develop an efficient method for exciting and controlling spoof LSPs.
• To demonstrate a multi-band-pass filter based on the proposed resonator and assess its sensing capabilities.

Main Methods:

• Numerical simulations and experimental verification of spoof LSPs in a corrugated ring resonator.
• Design and fabrication of a multi-band-pass filter using the resonator.
• Testing the device's sensitivity to refractive index variations.

Main Results:

• Suppression of unwanted high-order LSP modes and enhancement of fundamental modes.
• Successful demonstration of a high-performance multi-band-pass filter at microwave frequencies.
• Experimental results show excellent agreement with simulations.
• The fabricated device exhibits sensitivity to refractive index changes, even for thin materials like paper.

Conclusions:

• The corrugated ring resonator effectively controls spoof LSPs, enabling enhanced filter performance.
• The proposed device is suitable for multi-band filtering applications in microwave frequencies.
• The resonator's sensitivity to refractive index variations opens possibilities for sensing applications.