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High Numerical Aperture Hexagonal Stacked Ring-Based Bidirectional Flexible Polymer Microlens Array
journal contribution
posted on 2017-03-02, 19:34 authored by Rajib Ahmed, Ali K. Yetisen, Haider ButtFlexible
imprinted photonic nanostructures that are able to diffract/focus
narrow-band light have potential applications in optical lenses, filters,
tunable lasers, displays, and biosensing. Nanophotonic structures
through holography and roll-to-roll printing may reduce fabrication
complexities and expenses and enable mass production. Here, 3D photonic
nanostructures of a stacked ring array were imprinted on acrylate
polymer (AP) over poly(ethylene terephthalate) (PET) substrate through
holography and lift-off processes to create a microlens array (MLA).
The surface structure of the array consisted of circular nonostepped
pyramids, and repeated patterns were in hexagonal arrangements. Stacked-ring-based
MLA (SMLA) on a flexible AP–PET substrate showed efficient
bidirectional light focusing and maximum numerical aperture (NA =
0.60) with a reasonable filling factor. The nanostructures produced
a well-ordered hexagonally focused diffraction pattern in the far
field, and power intensities were measured through angle-resolved
experiments. The variation of nanostep dimensions (width and height)
and the number of steps resulted in different photonic bandgaps, and
the arrays produced distance-dependent narrow-band light focusing.
The validation of the SMLA was demonstrated through the text, image,
and hologram projection experiments. It is anticipated that imprinted
bidirectional SMLA over flexible substrates may find applications
in optical systems, displays, and portable sensors.
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Keywords
microlens arraydistance-dependent narrow-band lightangle-resolved experimentssubstratediffraction patternmass productionholographyPolymer Microlens Arraywell-ordered hexagonallyRing-Based Bidirectionalpower intensitiesacrylate polymerring arraynonostepped pyramids3 D photonic nanostructuresphotonic bandgapsNAhologram projection experimentsphotonic nanostructuresroll-to-roll printingbidirectional SMLAdisplayHigh Numerical Aperture Hexagonaltunable laserslift-off processesNanophotonic structuresapplicationbidirectional lightAPnanostep dimensionsfabrication complexitiessurface structureStacked-ring-based MLA
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