Abstract
We present a novel technique based on linear zone plate (LZP) by which linear singularities regarded as fractional vortex dipoles are efficiently generated. Our approach requires applying spiral phase to a LZP, so fractional vortex dipoles are then acquired. By also implementing transverse phase shift to the spiral LZP, we are able to equally divide the number of the produced dark beams carrying mixed phase dislocations into two transverse separate parts. As a result, by varying a so called the controlling parameter the lateral positions of the focused fractional vortex dipoles are changed. Since we are able to generate dark beams in different and specific linear positions, therefore we suggest these features will be of great interest in one-dimensional optical trapping. All results are completely verified by experimental works.
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Sabatyan, A., Gharbi, S. Appearance of fractional vortex dipoles by using spiral linear zone plate. Opt Quant Electron 49, 226 (2017). https://doi.org/10.1007/s11082-017-1062-z
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DOI: https://doi.org/10.1007/s11082-017-1062-z