What is microlens array?

What is microlens array?

Microlens arrays (or micro-lens arrays) are one- or two-dimensional arrays of microlenses, i.e., rather small lenses (lenslets). In most cases, the lenslets form a periodic pattern either of square or hexagonal type, where the lens pitch is a few hundred micrometers, some tens of micrometers or even less.

What type of microscope is a microlens microscope?

optical microscopes
In optical microscopes, two microlens arrays create uniform illumination. Two microlens arrays are placed into the illumination path of a microscope, achieving highly accurate imaging. Microlenses are also used in 3D imaging and displays.

What are the uses of micro lens?

Applications. Single micro-lenses are used to couple light to optical fibres; microlens arrays are often used to increase the light collection efficiency of CCD arrays and CMOS sensors, to collect and focus light that would have otherwise fallen onto the non-sensitive areas of the sensor.

What are MLA optics?

Micro Lens Array (MLA) from ams operate as ultra-small projectors which have images integrated into the micro-optic lens, producing sharp images in brilliant color.

How are microlens arrays made?

Microlens arrays can be made by injection molding or by embossing from some master form. This is done particularly with plastic (polymer) materials. There are printing methods, where microdroplets of a liquid polymer material are deposited on a plane surface to form lenslets.

WHAT IS lens pitch?

The “pitch” of the lens is the fraction of a full sinusoidal period that the ray traverses in the lens (i.e., a lens with a pitch of 0.25 has a length equal to 1/4 of a sine wave, which would collimate a point source located at the surface of the lens).

How is a microlens made?

What is gradient index lens?

Gradient index micro lenses (GRIN lenses or GRIN Rod Lenses) have a radially varying index of refraction that causes an optical ray to follow a sinusoidal propagation path through the lens. They combine refraction at the end surfaces along with continuous refraction within the lens.

Are micro and macro lens same?

It turns out that macro and micro lenses are actually different names for the same thing and they both refer to lenses that you’d use to shoot macro photography. Canon calls their macro photography lenses “macro lenses” and Nikon calls them “micro lenses.” Go figure.

Microlens. Micro-lens arrays contain multiple lenses formed in a one-dimensional or two-dimensional array on a supporting substrate. If the individual lenses have circular apertures and are not allowed to overlap, they may be placed in a hexagonal array to obtain maximum coverage of the substrate.

What are the characteristics of spherical and aspherical microlens arrays?

Most spherical and aspherical microlens arrays are customized solutions, especially designed and manufactured for the individual needs of our customers. We manage to manufacture microlens arrays with the following typical characteristics: *) High relative radius tolerance ( < 0.2% ) For deviating requirements, please contact our specialists.

How many microlens are used in a microscope?

In optical microscopes, two microlens arrays can be used to realize uniform illumination. By placing two microlens arrays into the illumination path of a microscope, a coefficient of variation of the illumination uniformity between 1% and 2% can be achieved.

How are lens arrays made?

Lens arrays are usually produced with a micro-fabrication method which forms all microlenses in a single production step. For example, one may employ a photolithographic method, where the lens pattern is defined by a photolithographic mask, which can be of grayscale or binary type.