Publication

Arrays of microlenses with variable focal lengths fabricated by restructuring polymer surfaces with an ink-jet device

Ramon Pericet Camara
2007
Journal Articles

Abstract

We report of a method for fabricating two-dimensional, regular arrays of polymer microlenses with focal lengths variable between 0.2 and 4.5 mm. We first make concave microlenses by ink-jetting solvent on a polymer substrate with a commercial drop-on-demand device. Solvent evaporation restructures the surface by a series of combined effects, which are discussed. In the second step we obtain convex elastomeric microlenses by casting the template made in the first step. We demonstrate the good optical quality of the microlenses by characterising their surfaces with atomic force microscopy and white light interferometry, and by directly measuring their focal lengths with ad-hoc confocal laser scanning microscopy. (C) 2007 Optical Society of America.

Official source

https://infoscience.epfl.ch/entities/publication/5d355428-40e6-436f-b0f2-7b963c06adf3

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Ramon Pericet Camara
2007
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5d355428-40e6-436f-b0f2-7b963c06adf3

About this result

Related concepts (32)

Normal lens

In photography and cinematography, a normal lens is a lens that reproduces a field of view that appears "natural" to a human observer. In contrast, depth compression and expansion with shorter or longer focal lengths introduces noticeable, and sometimes disturbing, distortion. Photographic technology employs different physical methods from the human eye in order to capture images. Thus, manufacturing optics which produce images that appear natural to human vision is problematic.

Focal length

The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly.

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A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or . There is no major difference in principle between a lens used for a still camera, a video camera, a telescope, a microscope, or other apparatus, but the details of design and construction are different.

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Arrays of microlenses with variable focal lengths fabricated by restructuring polymer surfaces with an ink-jet device

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