Broadband plasmonic nanoantenna with an adjustable spectral response

Area of Science:

• Plasmonics and Nanophotonics
• Optical Engineering

Background:

• Plasmonic nanoantennas are crucial for manipulating light at the nanoscale.
• Common-gap designs offer unique electromagnetic coupling opportunities.
• Broadband spectral responses are desirable for various photonic applications.

Purpose of the Study:

• To investigate the spectral response of six- and eight-particle common-gap plasmonic nanoantennas.
• To demonstrate light-focusing capabilities at different frequencies.
• To explore the influence of polarization and geometric parameters on spectral characteristics.

Main Methods:

• Fabrication and characterization of multi-particle common-gap plasmonic nanoantennas.
• Numerical simulations to analyze electromagnetic field distributions and spectral responses.
• Illumination with circular and elliptical polarization to study light-matter interactions.

Main Results:

• Achieved a broadband spectral response from the common-gap nanoantenna configurations.
• Demonstrated the ability to focus light at distinct frequencies.
• Showcased spectral response manipulation through geometrical adjustments.
• Tailored spectral peak intensity using the ellipticity of polarized light.

Conclusions:

• Multi-particle common-gap plasmonic nanoantennas are effective for broadband light manipulation.
• Elliptical polarization offers a method for controlling spectral properties and light focusing.
• The design provides a versatile platform for advanced photonic applications.