Abstract:
The
diffraction of a dielectric microline pair is optimized by numerical
simulations to generate an efficient focusing pattern with a micron-scale
footprint. Microlines separated by 1.12 μm are fabricated by two-photon
polymerization on a glass substrate, and their diffraction pattern is characterized
by three-dimensional wide-field transmission microscopy. A line pair, having a
width W=0.40 μm and a height H=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.
Publisher/link
to publication: Chinese Optics
Letters. 2019;17 DOI:10.3788/COL201917.082201
Link COL: http://www.opticsjournal.net/ViewFull0.htm?aid=OJ5c8af1f71c789fc2
Link OSA: https://www.osapublishing.org/col/abstract.cfm?uri=col-17-8-082201
Link ResearchGate:
https://www.researchgate.net/publication/334417020_Diffraction-limited_microfocusing_generated_by_polymer_microlines_separated_by_112_mm
