Plasmonic array nanoantennas on layered substrates: modeling and radiation characteristics

Area of Science:

• Plasmonics
• Nanophotonics
• Optical Engineering

Background:

• Plasmonic core-shell nano-radiators are key components in nanophotonics.
• Controlling radiation performance of nanoantennas is crucial for device applications.
• Engineered substrates offer a method to manipulate nanoantenna behavior.

Purpose of the Study:

• To theoretically characterize the performance of plasmonic core-shell nano-radiator arrays on layered substrates.
• To investigate engineered substrates for manipulating nanoantenna radiation.
• To develop an analytical model for predicting nanoantenna performance.

Main Methods:

• Green's function analysis of dipoles above layered materials.
• Modeling subwavelength spherical particles as induced electric dipoles.
• Validation using full-wave finite difference time domain (FDTD) numerical technique.

Main Results:

• Demonstrated that nano-particle arrays and multilayer substrates can engineer radiation patterns and beam angles.
• Each particle acts as an induced electric dipole at electric scattering resonances.
• The theoretical model accurately predicts nanoantenna performance.

Conclusions:

• Novel arraying of nano-particles and tailored multilayer substrates enable precise control over optical nanoantennas.
• The developed analytical approach provides an effective tool for studying plasmonic nano-radiator performance.
• Finite substrate size effects can be explored using FDTD.