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Crystals 2019, 9(4), 198; https://doi.org/10.3390/cryst9040198

Flexible Photonic Nanojet Formed by Cylindrical Graded-Index Lens

Department of Biomedical Engineering, National Yang-Ming University, Taipei City 11221, Taiwan
Received: 18 March 2019 / Revised: 5 April 2019 / Accepted: 5 April 2019 / Published: 7 April 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
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Abstract

Photonic nanojets formed in the vicinity of the cylindrical graded-index lens with different types of index grading are numerically investigated based on the finite-difference time-domain method. The cylindrical lens with 1600 nm diameter is assembled by eighty-seven hexagonally arranged close-contact nanofibers with 160 nm diameter. Simulation and analysis results show that it is possible to engineer and elongate the photonic nanojet. Using differently graded-index nanofibers as building elements to compose this lens, the latitudinal and longitudinal sizes of the produced photonic nanojet can be flexibly adjusted. At an incident wavelength of 532 nm, the cylindrical lens with index grading = 2 can generate a photonic nanojet with a waist about 173 nm (0.32 wavelength). This lens could potentially contribute to the development of a novel device for breaking the diffraction limit in the field of optical nano-scope and bio-photonics. View Full-Text
Keywords: cylindrical lens; photonic nanojet; graded-index cylindrical lens; photonic nanojet; graded-index
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Liu, C.-Y. Flexible Photonic Nanojet Formed by Cylindrical Graded-Index Lens. Crystals 2019, 9, 198.

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