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High-order spoof localized surface plasmons supported on a complementary metallic spiral structure.

Zhen Gao¹, Fei Gao¹, Baile Zhang^1,2

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

Scientific Reports

|April 16, 2016

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Researchers discovered new high-order spoof localized surface plasmons (spoof-LSPs) modes on complementary metallic spiral structures. These modes show greater sensitivity to refractive index changes, suggesting potential as microwave and terahertz plasmonic sensors.

Area of Science:

Condensed matter physics
Electromagnetism
Materials science

Background:

Spoof localized surface plasmons (spoof-LSPs) are electromagnetic modes that mimic optical plasmons on metallic surfaces at lower frequencies.
Previous research primarily focused on low-order spoof-LSPs modes, limiting sensing capabilities.
Metallic spiral structures offer a platform for supporting unique plasmonic phenomena.

Purpose of the Study:

To experimentally demonstrate the existence of multiple high-order spoof-LSPs modes on a complementary metallic spiral structure.
To investigate the sensing capabilities of these newly observed high-order spoof-LSPs modes.
To explore potential applications in microwave and terahertz sensing technologies.

Main Methods:

Experimental fabrication and characterization of complementary metallic spiral structures.

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Exact numerical simulations to model and analyze spoof-LSPs modes.

Near-field imaging experiments to directly visualize the high-order spoof-LSPs modes at microwave frequencies.

Main Results:

Successfully demonstrated multiple high-order spoof-LSPs modes, previously unreported.
Observed these modes experimentally at microwave frequencies.
Showcased that higher-order spoof-LSPs modes exhibit significantly larger frequency shifts in response to local refractive index changes compared to low-order modes.

Conclusions:

Complementary metallic spiral structures support novel high-order spoof-LSPs modes.
These high-order modes offer enhanced sensitivity for refractive index sensing.
The findings suggest potential applications for complementary metallic spiral structures as plasmonic sensors in microwave and terahertz regimes.