Abstract
Data capacity is rapidly reaching its limit in modern optical communications. Optical vortex has been explored to enhance the data capacity for its extra degree of freedom of angular momentum. In traditional means, optical vortices are generated using space light modulators or spiral phase plates, which would sharply decrease the integration of optical communication systems. Here we experimentally demonstrate a planar chiral antenna array to produce optical vortex from a circularly polarized light. Furthermore, the antenna array has the ability to focus the incident light into point, which greatly increases the power intensity of the generated optical vortex. This chiral antenna array may have potential application in highly integrated optical communication systems.
Highlights
A b c d y φ x la lb p t required in order to filter the co-polarized components
We demonstrate a chiral meta-surface to convert a circularly polarized light into an optical vortex and focus the converted light to a predicated point
The meta-surface tunes the phase distribution of the incident beam based on the concept of discontinues phase modulation
Summary
A b c d y φ x la lb p t required in order to filter the co-polarized components. We demonstrate a chiral meta-surface to convert a circularly polarized light into an optical vortex and focus the converted light to a predicated point. The meta-surface tunes the phase distribution of the incident beam based on the concept of discontinues phase modulation. By properly designing the phase modulation distribution, the co-polarized component of the incident field does not participate in the focusing process. Only optical vortex can be observed in the focused field. The thickness of this planar chiral meta-surface is less than λ /4, has potential application in compact integrated optical systems
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