Journal article
Bioinspired microstructured polymer surfaces with antireflective properties
National Centre for Nano Fabrication and Characterization, Technical University of Denmark1
Nanofabrication, National Centre for Nano Fabrication and Characterization, Technical University of Denmark2
Polymer Microsystems, Nanofabrication, National Centre for Nano Fabrication and Characterization, Technical University of Denmark3
Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics, Department of Health Technology, Technical University of Denmark4
Nanoprobes, Drug Delivery and Sensing, Department of Health Technology, Technical University of Denmark5
Department of Health Technology, Technical University of Denmark6
Technical University of Denmark7
Magnetic Resonance, Department of Health Technology, Technical University of Denmark8
Magnetic Resonance by Optics, Magnetic Resonance, Department of Health Technology, Technical University of Denmark9
Over the years, different approaches to obtaining antireflective surfaces have been explored, such as using index-matching, interference, or micro-and nanostructures. Structural super black colors are ubiquitous in nature, and biomimicry thus constitutes an interesting way to develop antireflective surfaces.
Moth-eye nanostructures, for example, are well known and have been successfully replicated using micro-and nanofabrication. However, other animal species, such as birds of paradise and peacock spiders, have evolved to display larger structures with antireflective features. In peacock spiders, the antireflective properties of their super black patches arise from relatively simple microstructures with lens-like shapes organized in tightly packed hexagonal arrays, which makes them a good candidate for cheap mass replication techniques.
In this paper, we present the fabrication and characterization of antireflective microarrays inspired by the peacock spider’s super black structures encountered in nature. Firstly, different microarrays 3D models are generated from a surface equation. Secondly, the arrays are fabricated in a polyacrylate resin by super-resolution 3D printing using two-photon polymerization.
Thirdly, the resulting structures are inspected using a scanning electron microscope. Finally, the reflectance and transmittance of the printed structures are characterized at normal incidence with a dedicated optical setup. The bioinspired microlens arrays display excellent antireflective properties, with a measured reflectance as low as 0.042 ± 0.004% for normal incidence, a wavelength of 550 nm, and a collection angle of 14.5°.
These values were obtained using a tightly-packed array of slightly pyramidal lenses with a radius of 5 µm and a height of 10 µm.
Language: | English |
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Publisher: | MDPI |
Year: | 2021 |
Pages: | 2298 |
ISSN: | 20794991 |
Types: | Journal article |
DOI: | 10.3390/nano11092298 |
ORCIDs: | Wetzel, Alexandre Emmanuel , 0000-0003-4863-2851 , Bunea, Ada Ioana , Taboryski, Rafael , Del Castillo Iniesta, Nuria , Engay, Einstom , Mandsberg, Nikolaj Kofoed and Berg-Sørensen, Kirstine |