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Optical source transformations
N Kundtz1, D A Roberts, J Allen
1Center for Metamaterials and Integrated Plasmonics, Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.
Optics Express
|December 24, 2008
Summary
Transformation optics, a method for controlling wave propagation, is expanded to include sources. This technique, demonstrated with simulations, restores dipole radiation patterns for complex antenna designs.
Area of Science:
- Physics
- Electromagnetics
- Wave Propagation
Background:
- Transformation optics designs complex media to control wave propagation.
- Current methods primarily use passive space transformations.
- The technique's potential with active sources remains underexplored.
Purpose of the Study:
- To explore and demonstrate the application of transformation optics to include source distributions.
- To illustrate the potential of source transformations for advanced wave control.
- To propose source transformations as a novel antenna design methodology.
Main Methods:
- Applying coordinate transformations to regions including source distributions.
- Utilizing finite-element full-wave simulations for analysis.
- Investigating the restoration of dipole radiation patterns.
Main Results:
- Demonstrated successful restoration of dipole radiation patterns from distorted antennas.
- Confirmed effectiveness with a 'pin-wheel' antenna and a bent dipole.
- Validated the concept of source transformations through simulations.
Conclusions:
- Source transformations offer a powerful new approach in transformation optics.
- This method shows significant promise for designing conformal antennas.
- Expanded transformation optics can effectively manage wave propagation from complex sources.
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