Imaging-quality 3D-printed centimeter-scale lens

Assefa, Bisrat G.; Pekkarinen, Markku; Partanen, Henri; Biskop, Joris; Turunen, Jari; Saarinen, Jyrki

doi:10.1364/oe.27.012630

Cited by 50 publications

(25 citation statements)

References 13 publications

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“…Using cheaper camera and diffraction grating can bring the total price down to few hundred euros [8]. Recent development in 3D-printing imaging quality lenses [16] may lower the cost further in the future. A further benefit of using 3D-printed optics would be that, as it does not matter if normal or aberration corrected lens is printed, one could use better lenses in do-it-yourself imagers without additional cost and thus reduce the amount of aberrations.…”

Section: Methodsmentioning

confidence: 99%

A Do-It-Yourself Hyperspectral Imager Brought to Practice with Open-Source Python

Riihiaho¹,

Eskelinen²,

Pölönen³

2021

Sensors

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Commercial hyperspectral imagers (HSIs) are expensive and thus unobtainable for large audiences or research groups with low funding. In this study, we used an existing do-it-yourself push-broom HSI design for which we provide software to correct for spectral smile aberration without using an optical laboratory. The software also corrects an aberration which we call tilt. The tilt is specific for the particular imager design used, but correcting it may be beneficial for other similar devices. The tilt and spectral smile were reduced to zero in terms of used metrics. The software artifact is available as an open-source Github repository. We also present improved casing for the imager design, and, for those readers interested in building their own HSI, we provide print-ready and modifiable versions of the 3D-models required in manufacturing the imager. To our best knowledge, solving the spectral smile correction problem without an optical laboratory has not been previously reported. This study re-solved the problem with simpler and cheaper tools than those commonly utilized. We hope that this study will promote easier access to hyperspectral imaging for all audiences regardless of their financial status and availability of an optical laboratory.

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Section: Methodsmentioning

confidence: 99%

A Do-It-Yourself Hyperspectral Imager Brought to Practice with Open-Source Python

Riihiaho¹,

Eskelinen²,

Pölönen³

2021

Sensors

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“…In order to fabricate graphene enhanced THz metasurface, we employ a high-resolution layer-by-layer 3D printing technique [ 29 , 30 , 31 ] with 3D printer having three independent heads. Each head sends out drops of the liquid polymer LUX-Opticlear (Luxexcel, Alpharetta, GA, USA).…”

Section: Methodsmentioning

confidence: 99%

Terahertz Absorber with Graphene Enhanced Polymer Hemispheres Array

et al. 2021

Self Cite

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We propose an original technique for the fabrication of terahertz (THz) metasurfaces comprising a 3D printed regular array of polymer hemispheres covered with a thin conductive layer. We demonstrate that the deposition of a thin metal layer onto polymer hemispheres suppresses the THz reflectivity to almost zero, while the frequency range of such a suppression can be considerably broadened by enhancing the structure with graphene. Scaling up of the proposed technique makes it possible to tailor the electromagnetic responses of metasurfaces and allows for the fabrication of various components of THz photonics.

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“…Three-dimensional (3D) printing, referring to the technology of fabricating 3D parts layer-by-layer from computer-aided design (CAD) models, is a promising method for fabricating elements that are challenging using traditional technologies, such as vascular stents [4], microfluidic devices [5], micro-lattices [6], and some optical components (for example, micro-lens arrays [7,8], ultracompact multi-lens objectives [9], and aspheric lenses [10][11][12]). Stereolithography (SLA) is a 3D printing technology that uses photocurable resin to manufacture objects [13], and characterizes high resolution and accuracy.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Customized Aspheric Lenses for Imaging

Zhu¹,

Zhang

et al. 2021

Polymers

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A simple and efficient process for fabricating customized aspheric lenses is reported, in which a stereolithographic 3D printer combined with the meniscus equilibrium post-curing technique is employed. Two kinds of UV-curable resins, DentaClear and HEMA, were used for printing aspheric lenses in our experiments. The printed DentaClear lens featured low surface profile deviation of ~74 and showed satisfactory optical imaging resolution of 50.80 lp/mm, i.e., 4.92 . The surface roughness of the printed lens with DentaClear was measured to be around 2 nm with AFM. The surface roughness was improved as a result of post-curing, which reduced the ripples on printed lens surfaces. In contrast, the printed HEMA lens exhibited a significant stair-stepping effect with a large surface profile deviation of ~150. The ripples were somewhat apparent even if the printed HEMA lens surface was smoothed by means of post-curing. No sharp image can be obtained with the HEMA lens in the resolution testing. The composition of HEMA resin may be the reason for the relatively poor surface quality and optical properties.

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Imaging-quality 3D-printed centimeter-scale lens

Cited by 50 publications

References 13 publications

A Do-It-Yourself Hyperspectral Imager Brought to Practice with Open-Source Python

A Do-It-Yourself Hyperspectral Imager Brought to Practice with Open-Source Python

Terahertz Absorber with Graphene Enhanced Polymer Hemispheres Array

3D Printing of Customized Aspheric Lenses for Imaging

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