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Published on: April 1, 2020
Near-field focusing with optical phase antennas
A G Curto1, A Manjavacas, F J García de Abajo
1ICFO Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860, Castelldefels (Barcelona), Spain.
Optics Express
|November 13, 2009
Summary
Researchers created 3D phase antennas with concentric rings that produce tight focal spots. These lenses create subwavelength focal spots at a distance, enabling applications in microscopy and lithography.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Near-field focusing is crucial for advanced optical applications.
- Phase antennas offer a novel approach to controlling light at the nanoscale.
Purpose of the Study:
- To investigate the near-field focusing properties of 3D phase antennas.
- To analyze the impact of geometrical parameters on lens performance.
Main Methods:
- Fabrication of 3D phase antennas using silicon or gold rings in a silica matrix.
- Characterization of near-field focusing properties and focal spot formation.
- Systematic analysis of geometrical parameters: number of rings, ring thickness, and focal distance.
Main Results:
- Achieved tight focal spots using concentric ring structures.
- Demonstrated subwavelength focal spot formation at distances of tens of wavelengths.
- Identified key geometrical parameters influencing lens performance.
Conclusions:
- 3D phase antennas can achieve efficient near-field focusing.
- The design enables subwavelength focusing at remote distances.
- Potential applications include remote sensing, penlight microscopy, and lithography.
