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학술지 Directly Fabricated Multi-scale Microlens Arrays on a Hydrophobic Flat Surface by a Simple Ink-jet Printing Technique
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김주연, Karl Pfeiffer, Anja Voigt, Gabi Gruetzer, Juergen Brugger
Journal of Materials Chemistry, v.22 no.7, pp.3053-3058
Royal Society of Chemistry (RSC)
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A shape-tunable approach is demonstrated for the fabrication of multi-scale polymer microlenses (μ-lenses) and microlens arrays (MLAs) using an ink-jet printing (IJP) technique. Also, the influence of the surface wetting conditions on the geometrical and optical characteristics of the printed μ-lenses is investigated. A photo-curable organic-inorganic hybrid polymeric resist (H-resist) is used; it is printed on a hydrophobic-treated glass substrate with different number of drops per μ-lens and cured using an ultraviolet lamp (UV lamp). High quality μ-lenses and MLAs with good uniformity and reproducibility were fabricated. The lens diameters and heights were controllable by changing the number of H-resist drops together with tuning the surface wetting conditions; these shape changes affect the optical properties of the μ-lenses and MLAs such as the numerical aperture (NA) and focal distance (f), as well as the f-number (f #), which indicates the light-gathering power. The optical properties of the tunable μ-lenses and MLAs are very attractive for application in optical systems such as interconnects and pixelated imagine sensors that use CCD or SPAD arrays, offering an efficient, simple and cheap alternative to the conventionally used photolithography technique. © 2012 The Royal Society of Chemistry.
KSP 제안 키워드
F-number, Flat surface, Glass substrate, Microlens array, Multi-scale, Optical characteristics, Organic-inorganic hybrid, Photo-curable, Photolithography technique, SPAD array, Surface wetting