Selective amplification of spoof localized surface plasmons.

Area of Science:

• Plasmonics
• Metamaterials
• Microwave Engineering

Background:

• Spoof localized surface plasmons (LSPs) are crucial for subwavelength wave manipulation.
• Existing resonators often lack efficient amplification mechanisms.
• Corrugated metal-insulator-metal (MIM) structures offer tunable plasmonic properties.

Purpose of the Study:

• To demonstrate selective amplification of spoof LSPs in a resonator.
• To enhance the transmission intensity of spoof LSPs.
• To investigate the amplification mechanism for microwave sensing applications.

Main Methods:

• Designing a corrugated MIM ring resonator with coupling stubs.
• Incorporating an amplifier chip for signal enhancement.
• Utilizing circuit and full-wave simulations for mechanism investigation.
• Experimental validation of simulated results.

Main Results:

• Achieved selective amplification of the quadrupole mode.
• Increased transmission intensity from -6.46 dB to 10.74 dB via bias voltage adjustment.
• Demonstrated excellent agreement between numerical simulations and experimental measurements.

Conclusions:

• The developed active amplified resonator effectively amplifies spoof LSPs.
• The device shows significant potential for high-performance chemical and biological sensing at microwave frequencies.
• The study provides a robust platform for active plasmonic devices.