Journal
JOURNAL OF OPTICS
Volume 17, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2040-8978/17/7/075602
Keywords
transformation optics; Fresnel zone plate; dual functionalities
Categories
Funding
- National Natural Science Foundation of China [61301072]
- Xidian University
- Royal Society, U.K.
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Instead of reshaping the standard parabolic reflector or the hyperbolic lens to propose their planar counterparts, here we choose to flatten the primary spherical wave front based on the quasi-conformal transformation optics. Ray traces, travelling from the source to the transformed planar surface, can thus be maintained of the equal electrical path length in terms of the transformation-optics Fresnel zone plate. Due to the symmetrical feature of our transformation setup, the proposed device would readily possess dual functionalities in the light focusing and collimation that can either be applied to a reflector when incorporated with a plane mirror or directly employed as a standalone lens according to the principle of the image theory.
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