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Unconventional, efficient and flexible bifocal lens design by metalens and AFA beam combination
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering. TMU, Dept Mat Engn, Nanomat Grp, POB 14115-143, Tehran, Iran.
Fasa Univ, Coll Sci, Dept Phys, Fasa 7461781189, Iran..
Univ Valencia, Dept Opt & Optometry & Vis Sci, Dr Moliner 50, E-46100 Burjassot, Spain..
2019 (English)In: Journal of Optics, ISSN 2040-8978, E-ISSN 2040-8986, Vol. 21, no 5, article id 055101Article in journal (Refereed) Published
Abstract [en]

In the field of metasurface-based light focusing, both convex metalenses with parabolic phase profile and autofocused Airy (AFA) beams play essential roles. AFA beam generation as a combination of two convergent mirrored Airy beams leaves the space between the two launched Airy profiles inefficient with zero amplitude transmission and constant phase distribution. In this paper, we propose using this inutile space as an independent metalens. We show that coincidence of the focal spot of the metalens to that of the AFA beam will increase the focusing intensity more than 24 percent at its focal point. It is shown that using the nonoperative space between the two launched Airy beams as an independent metalens not only does not disrupt the AFA focusing efficiency, but also enables us to use the full potential of the space to increase the focusing efficiency or flexibly assigning the focusing spots.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019. Vol. 21, no 5, article id 055101
Keywords [en]
metasurfaces, auto focused airy beams, metalens, bifocal lenses
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-249848DOI: 10.1088/2040-8986/ab0fe8ISI: 000462838400001Scopus ID: 2-s2.0-85067808898OAI: oai:DiVA.org:kth-249848DiVA, id: diva2:1306536
Note

QC 20190424

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-10-04Bibliographically approved

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