What are microlenses used for?

can be achieved using on this method. However, this process requires expensive equipment and complicated procedures to produce the mask on the wafer. Besides, the control precision of the mask fabrication technology should be improved to meet certain requirements in the miniaturization of lenses. However, the optical system is hard to be miniaturized since it needs overlapping of the concave and the convex bulk lenses .

Wu MH, Whitesides GM. Fabrication of arrays of two-dimensional micropatterns using microspheres as lenses for projection photolithography. For more info on related products, consult ourother guidesor visit theThomas Supplier Discovery Platformto locate potential sources of supply or view details on specific products. Schlingloff G, Kiel HJ, Schober A. Microlenses as amplification for CCD-based detection devices for screening applications in biology, biochemistry, and chemistry. We also have lens configurations as hexagonal and square configurations, along with random, with options of close packed lenses or with gaps between the lenses.

Cylindrical Microlens

These methods are similar to the production processes for integrated circuits and other microelectronics. Holo/Or offers amicrolens arraywith 100% “packing,” that’s covering the entire surface without gaps between your lenses, to make sure maximum energy efficiency and optimal zero-order homogenization. Holo/Or also offersbroadband diffusers , often known as engineered diffusers, which are a unique kind of microlens array with a non-uniform arrangement, presenting much better shaping uniformity in comparison to an individual lens array.

• The photodiode with out a microlens collects a significantly lower part of incoming photons, because the ones that impact on shielded areas are not useful in control integration.
• The main element to the indirect methods is how to generate concave microlenses with precise geometry.

a spherical surface. Like the problem in the fabrication of planar compound eye, the requirement of precise alignment of the photodetector and microlens is hard to attain. We present a high-numerical aperture, doublet microlens array for imaging micron-sized objects. The proposed doublet architecture consists of glass microspheres trapped on a predefined selection of silicon microholes and covered with a thin polymer layer. A standard silicon microfabrication process and a novel fluidic assembly technique were combined to obtain a range of 56 μm diameter microlenses with a numerical aperture of ~0.5. Using this array, we demonstrated brightfield and fluorescent image formation of objects on a CCD sensor minus the use of intermediate lenses. High-NA (NA ~ 0.64) spherical microlenses are also microfabricated by injecting SU-8 photoresist through microfabricated nozzles and utilizing surface tension to form micro-balls .

Cylindrical Microlens

For most optical systems in this application group, amulti-spot DOEwith a focus lens can offer more flexibility and better performance. “These novel photodetector arrays offer important advantages in comparison to confocal microscopy but can’t collect as much light as traditional single point detectors,” said Duocastella. “We think that microlenses, and laser catapulting specifically, will help enhance the performance of these photodetector arrays and expand their use on the list of microscopy community.” Guo R, Yuan D, Das S. Large-area microlens arrays fabricated on flexible polycarbonate sheets via single-step laser interference ablation. Low (4×) and high (40×) magnification measurements were extracted from a 4 × 4 microlens array and from the single microlens respectively to obtain the point spread function .