Fraxicon for Optical Applications with Aperture ∼1 mm: Characterisation Study

Emerging applications of optical technologies are driving the development of miniaturised light sources, which in turn require the fabrication of matching micro-optical elements with sub-1 mm cross-sections and high optical quality. This is particularly challenging for spatially constrained biomedic...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-01, Vol.14 (3), p.287
Main Authors: Mu, Haoran, Smith, Daniel, Ng, Soon Hock, Anand, Vijayakumar, Le, Nguyen Hoai An, Dharmavarapu, Raghu, Khajehsaeidimahabadi, Zahra, Richardson, Rachael T, Ruther, Patrick, Stoddart, Paul R, Gricius, Henrikas, Baravykas, Tomas, Gailevičius, Darius, Seniutinas, Gediminas, Katkus, Tomas, Juodkazis, Saulius
Format: Article
Language:English
Subjects:
3-D printers
Aperture
Biomedical engineering
Biomedical materials
direct laser writing
Endoscopy
Energy
Fabrication
fraxicon
Fresnel lenses
Genetics
Glass substrates
Illumination
Information processing
Kinematics
Lasers
Light sources
Materials research
micro-optics
Miniature craft
Miniature objects
Nanotechnology
Numerical models
Optical components
Optical properties
Optics
Plane waves
Polymers
Propagation
RGB
SZ2080™ resist
Writing
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Summary:Emerging applications of optical technologies are driving the development of miniaturised light sources, which in turn require the fabrication of matching micro-optical elements with sub-1 mm cross-sections and high optical quality. This is particularly challenging for spatially constrained biomedical applications where reduced dimensionality is required, such as endoscopy, optogenetics, or optical implants. Planarisation of a lens by the Fresnel lens approach was adapted for a conical lens (axicon) and was made by direct femtosecond 780 nm/100 fs laser writing in the SZ2080™ polymer with a photo-initiator. Optical characterisation of the positive and negative fraxicons is presented. Numerical modelling of fraxicon optical performance under illumination by incoherent and spatially extended light sources is compared with the ideal case of plane-wave illumination. Considering the potential for rapid replication in soft polymers and resists, this approach holds great promise for the most demanding technological applications.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano14030287