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Subwavelength plasmonics for graded-index optics on a chip
Optics Letters
|October 10, 2013
Summary
Researchers developed a planar plasmonic graded-index lens to precisely control surface plasmons on-chip. This innovation enables manipulation of plasmonic modes for various integrated photonic applications.
Area of Science:
- Photonics
- Nanotechnology
- Materials Science
Background:
- Planar plasmonic devices offer on-chip integration potential for microelectronics.
- Precise control over plasmonic mode properties (shape, size) is crucial for on-chip applications.
Purpose of the Study:
- To demonstrate a planar plasmonic graded-index lens for focusing surface plasmons.
- To achieve precise control over plasmonic mode manipulation on a chip.
Main Methods:
- Carving subwavelength features into a dielectric layer atop a metal film.
- Utilizing a single binary lithographic step to define the dielectric layer.
- Creating a local control over the plasmonic mode's effective index.
Main Results:
- Experimental demonstration of focusing and divergence of surface plasmons.
- Successful manipulation of plasmonic modes using the graded-index lens.
- Achieved local control of effective index via subwavelength dielectric features.
Conclusions:
- The demonstrated graded-index lens provides a method for manipulating surface plasmon propagation.
- This approach is applicable to beam steering, splitting, cloaking, mode matching, and beam shaping.
- The technique offers a pathway for advanced on-chip plasmonic device functionalities.
