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dc.contributor.authorKlemm, A.B.
dc.contributor.authorStellinga, D.
dc.contributor.authorMartins, E.R.
dc.contributor.authorLewis, L.
dc.contributor.authorO'Faolain, L.
dc.contributor.authorKrauss, T.F.
dc.identifier.citationKlemm , A B , Stellinga , D , Martins , E R , Lewis , L , O'Faolain , L & Krauss , T F 2014 , ' Focusing with planar microlenses made of two-dimensionally varying high contrast gratings ' , Optical Engineering , vol. 53 , no. 9 , 095104 .
dc.descriptionThe authors thank the European Union for the financial support through Marie Curie Action FP7-PEOPLE-2010-ITN Project No. 264687 “PROPHET”.en
dc.description.abstractWe report on the focusing performance of reflective two-dimensionally varying high contrast grating lenses based on silicon. The combination of their subwavelength nature and their high refractive index contrast makes it possible to create highly tolerant and planar microlenses. We used a rigorous mathematical code to design the lenses and verified their performance with finite element simulations. We also investigated the effects of grating thickness, angle, and wavelength of incidence in these simulations. Experimentally, we show the evolution of the beam profile along the optical axis for a lens with a high (0.37) numerical aperture. We have explored a wide range of numerical apertures (0.1-0.93) and show that the lenses behave as expected across the full range. Our analyses demonstrate the large design flexibility with which these lenses can be made along with ease of fabrication and potential for a number of applications in micro-optics.
dc.relation.ispartofOptical Engineeringen
dc.subjectDiffractive opticsen
dc.subjectFlat opticsen
dc.subjectPhotonic crystalsen
dc.subjectHigh index contrasten
dc.subjectNumerical apertureen
dc.subjectQC Physicsen
dc.titleFocusing with planar microlenses made of two-dimensionally varying high contrast gratingsen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Microphotonics and Photonic Crystals Groupen
dc.description.statusPeer revieweden
dc.identifier.grantnumber264687 264687 264687en

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