期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 50, 期 17, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa61cb
关键词
photonic nanojet; pupil mask; cuboid; diffraction limit
资金
- Ser Cymru National Research Network in Advanced Engineering and Materials [NRNF66, NRN113]
- Newton Research Collaboration Programme [NRCP1516/1/153]
- Knowledge Economy Skills Scholarships [BUK289]
Photonic nanojets can be created via plane wave irradiation of multi-shaped mesoscale dielectric particles, and a waist of full-width at half-maximum (FWHM) smaller than the diffraction limit can be achieved in this process. In this paper, photonic nanojet produced by a pupil-masked 3D dielectric cuboid lens is numerically investigated under the irradiation of 532 nm wavelength plane wave. It is found that a pupil-masked cuboid lens is not only able to produce photonic nanojets with shorter FWHMs, but also increase its maximal intensity at certain masking ratios on the receiving surface. This phenomenon is different from the result of the spherical-lens reported in previous publications, and is attributed to the convergence of power flow and near-field numerical aperture (NA) increase after analysis of simulated power flow diagrams.
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