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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Unidirectional and wavelength-selective photonic sphere-array nanoantennas.
Yang G Liu1, Wallace C H Choy, Wei E I Sha
1Institute of Applied Physics and Computational Mathematics, Fenghao East Road, Beijing, China.
Optics Letters
|June 5, 2012
Summary
We developed a novel photonic nanoantenna (NA) that achieves high directionality and wavelength selectivity by minimizing metallic losses. This design offers enhanced performance for applications like photon detection and light emission control.
Area of Science:
- Photonics
- Nanotechnology
- Optical Engineering
Background:
- Plasmonic Yagi-Uda nanoantennas (NAs) offer directionality but suffer from inherent metallic losses.
- Achieving both strong directionality and wavelength selectivity in NAs is crucial for advanced optical applications.
Purpose of the Study:
- To design a photonic sphere-array nanoantenna (NA) that overcomes the limitations of plasmonic NAs.
- To achieve strong directionality and wavelength selectivity while minimizing optical losses.
Main Methods:
- Designing a photonic sphere-array nanoantenna configuration.
- Utilizing a sharp Fano resonance from a reflector tuned to a dipole resonance of a sphere-chain director.
- Analyzing the spectral overlap for tunable resonance and high directionality.
Main Results:
- Demonstrated a photonic sphere-array NA with strong directionality and wavelength selectivity.
- Reduced inherent metallic losses compared to plasmonic counterparts.
- Achieved tunable spectral overlap between Fano and dipole resonances for precise control.
Conclusions:
- The proposed photonic sphere-array NA provides a pathway to highly directional and selective optical devices.
- This design is particularly beneficial for applications in photon detection and manipulation of spontaneous emission.
- Offers a loss-minimized alternative to plasmonic NAs for optical functionalities.
