Packed Yagi-Uda nano-antennas using a unidirectional feed at visible wavelengths

Area of Science:

• Photonics and Nanotechnology
• Optical Engineering
• Plasmonics

Background:

• Controlling light at the nanoscale is crucial for on-chip optical communication systems.
• Conventional optical nano-antennas often face limitations in directivity and size.

Purpose of the Study:

• To introduce a novel, compact, and highly directive Yagi-Uda (P-YU) nano-antenna.
• To enhance the control over intensity and direction of optical waves for integrated photonic circuits.

Main Methods:

• Designed a packed Yagi-Uda (P-YU) nano-antenna utilizing a pair of strongly interacting gold nanorods as a feed.
• Leveraged antiphase hybridized plasmons at approximately 610 nm for unidirectional radiation.
• Simulated and analyzed the antenna's directivity and gain characteristics.

Main Results:

• Achieved dramatically improved directivity and gain in a significantly shortened antenna structure.
• Demonstrated that the P-YU nano-antenna design allows for reduced director count or overall size.
• Observed enhanced directionality in emission due to the sophisticated plasmonic feed.

Conclusions:

• The P-YU nano-antenna represents a significant advancement in miniaturized optical devices.
• This design offers a promising solution for efficient on-chip optical communications.
• The findings pave the way for next-generation integrated photonic technologies.