Diffraction-limited microfocusing generated by polymer microlines separated by 1.12 μm
Résumé
The diffraction of a dielectric microline pair is optimized by numerical simulations to generate an efficient focus-ing pattern with a micron-scale footprint. Microlines separated by 1.12 μm are fabricated by two-photon polym-erization on a glass substrate, and their diffraction pattern is characterized by three-dimensional wide-field transmission microscopy. A line pair, having a width W ¼ 0.40 μm and a height H ¼ 0.80 μm, leads to diffraction-limited focusing in the visible spectrum. Depending on wavelength, its focal length, lateral resolution, and depth of focus are in the ranges of 0.8-1.3 μm, 0.22-0.44 μm, and 1.7-2.13 μm, respectively. Such a microlens based on the diffraction of only two subwavelength scatterers could be used for the design of miniature optical sensors with micron and sub-micron pixels.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
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