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Near-infrared transmittance enhancement using fully conformal antireflective structured surfaces on microlenses fabricated by direct laser writing
Univ N Carolina, NC 28223 USA.
Univ N Carolina, NC 28223 USA.
Lasertel North Amer, AZ USA.
US CONEC, NC USA.
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2019 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 58, no 1, article id 010501Article in journal (Refereed) Published
Abstract [en]

Structured surfaces composed of subwavelength-sized features offer multifunctional properties including antireflective characteristics that are increasingly important for the development of micro-optical components. Here, three-dimensional (3-D) direct laser writing, via two-photon polymerization, is used to fabricate planoconvex spherical microlenses with antireflective structured surfaces. The surfaces are composed of subwavelength-sized conicoid structures, which are arranged fully conformal to the convex surface of the microlenses. The dimensions of the conicoid structures are optimized to effectively reduce Fresnel reflection loss over a wide band in the near-infrared spectral range from 1.4 to 2.2 mu m, with a maximum reduction at 1.55 mu m. Infrared reflection and transmission measurements are used, in combination with 3-D finite element calculations, to investigate the performance of the microlenses. The experimental results reveal that in the spectral range from 1.4 to 2.2 mu m an effective suppression of the Fresnel reflection loss at the convex surface of spherical microlenses can be achieved. The transmittance enhancement is ranging from 1% to 3% for spherical microlenses with antireflective structured surfaces, in comparison to an uncoated reference. (C) 2019 Society of Photo-Optical Instrumentation Engineers (SPIE)

Place, publisher, year, edition, pages
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS , 2019. Vol. 58, no 1, article id 010501
Keywords [en]
microlens fabrication; antireflection coatings; direct laser writing; nanostructures
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-157285DOI: 10.1117/1.OE.58.1.010501ISI: 000463893000002OAI: oai:DiVA.org:liu-157285DiVA, id: diva2:1323782
Note

Funding Agencies|National Science Foundation within the I/UCRC Center for Metamaterials [1624572]; Swedish Agency for Innovation Systems [2014-04712]; Department of Physics and Optical Science of the University of North Carolina at Charlotte

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-12

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