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Circular Microlens Array
Optical Lenses

Circular Microlens Array

Supplier
Zhilanweina
Category
Optical Lenses
Origin
China

Microlens arrays are typical micro/nano-optical elements: numerous micrometer-to-millimeter lenslets form two-dimensional periodic rectangular, hexagonal, or other patterns on one substrate. Each independently focuses light, modulates phase, divides wavefronts, homogenizes beams, or performs light-field imaging. They enable functions beyond conventional optics and new systems with low weight, small size, and easy integration. Definition: circular microlens arrays have circular lenslet apertures, as illustrated. Key parameters: 1. Pitch, adjacent lenslet-center spacing, determines density, typically tens of micrometers to millimeters; see figure. 2. EFL, individual focal length, determines focusing capability; see figure. 3. Fill factor, clear area divided by total array area. Circular boundaries limit theoretical rectangular packing to about 78.5% and close hexagonal packing to about 90.7%. 5. Surface shape, mainly spherical, with aspheres for precise spherical-aberration correction. Principles: 1. Focusing. Each independent miniature converging lens follows refraction laws. Parallel light bends at the curved surface due to the lens/air index difference. Each aperture's sub-beam converges to an individual focus in its focal plane. 2. Imaging. Micrometer-to-millimeter convex lenslets use geometrical refraction, but small apertures require diffraction/wave-optics analysis in many situations. Parallel rays refract toward the axis and focus. Focal length f is focus-to-principal-plane distance; u is object-to-lens distance and v image-to-lens distance. Gaussian imaging is referenced without a displayed expression. Infinite-distance objects form focal-plane spots; finite objects form real or virtual images on the other side, as stated. 3. Wavefront division. Circular aperture boundaries divide continuous wavefronts into lenslet-matched discrete sub-wavefronts, which recombine/overlap at the image plane after each lenslet acts, producing the target field. 4. Beam convergence. Micrometer-to-millimeter convex lenslets retain conventional refractive convergence. Manufacturing/customization: the company describes itself as an early Chinese independent precision micro/nano-optics developer with years of R&D/industrial experience. Engineers in optical design, micro/nanofabrication, and precision inspection have extensive array/DOE experience for independent nonstandard designs/process solutions. Its integrated in-house lithography line develops/produces circular arrays throughout. Pitch accuracy consistently reaches micrometer levels, overall figure uniformity is described as industry-leading, fill factors approach full coverage as claimed, and light utilization is high. Fused silica, silicon, germanium, and ZnSe cover UV through far IR. Custom antireflection/laser-resistant coatings tolerate intense light and maintain performance at high/low temperatures. The team controls simulation, structural optimization, prototypes, batches, and complete outgoing inspection, serving small university/research prototypes and large industrial orders. Short lead times and dedicated engineers provide rapid setup/corrections and complete homogenization, Hartmann sensing, and light-field reconstruction solutions. This circular-array page states that the company's quadrilateral arrays are widely used in Hartmann sensing, light-field imaging, precision laser processing, CCD coupling, and thermal imaging. Stable process precision/quality and after-sales support have secured long-term research/industry collaboration. The company describes itself as one of few Chinese benchmark suppliers independently developing/mass-producing the full array chain, offering technical, capacity, and after-sales assurance. Image captions: circular-array schematic; pitch schematic; focal-length schematic; circular-microlens microscope test; circular-microlens interferometer test.

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Overview

Microlens arrays are typical micro/nano-optical elements: numerous micrometer-to-millimeter lenslets form two-dimensional periodic rectangular, hexagonal, or other patterns on one substrate. Each independently focuses light, modulates phase, divides wavefronts, homogenizes beams, or performs light-field imaging. They enable functions beyond conventional optics and new systems with low weight, small size, and easy integration. Definition: circular microlens arrays have circular lenslet apertures, as illustrated. Key parameters: 1. Pitch, adjacent lenslet-center spacing, determines density, typically tens of micrometers to millimeters; see figure. 2. EFL, individual focal length, determines focusing capability; see figure. 3. Fill factor, clear area divided by total array area. Circular boundaries limit theoretical rectangular packing to about 78.5% and close hexagonal packing to about 90.7%. 5. Surface shape, mainly spherical, with aspheres for precise spherical-aberration correction. Principles: 1. Focusing. Each independent miniature converging lens follows refraction laws. Parallel light bends at the curved surface due to the lens/air index difference. Each aperture's sub-beam converges to an individual focus in its focal plane. 2. Imaging. Micrometer-to-millimeter convex lenslets use geometrical refraction, but small apertures require diffraction/wave-optics analysis in many situations. Parallel rays refract toward the axis and focus. Focal length f is focus-to-principal-plane distance; u is object-to-lens distance and v image-to-lens distance. Gaussian imaging is referenced without a displayed expression. Infinite-distance objects form focal-plane spots; finite objects form real or virtual images on the other side, as stated. 3. Wavefront division. Circular aperture boundaries divide continuous wavefronts into lenslet-matched discrete sub-wavefronts, which recombine/overlap at the image plane after each lenslet acts, producing the target field. 4. Beam convergence. Micrometer-to-millimeter convex lenslets retain conventional refractive convergence. Manufacturing/customization: the company describes itself as an early Chinese independent precision micro/nano-optics developer with years of R&D/industrial experience. Engineers in optical design, micro/nanofabrication, and precision inspection have extensive array/DOE experience for independent nonstandard designs/process solutions. Its integrated in-house lithography line develops/produces circular arrays throughout. Pitch accuracy consistently reaches micrometer levels, overall figure uniformity is described as industry-leading, fill factors approach full coverage as claimed, and light utilization is high. Fused silica, silicon, germanium, and ZnSe cover UV through far IR. Custom antireflection/laser-resistant coatings tolerate intense light and maintain performance at high/low temperatures. The team controls simulation, structural optimization, prototypes, batches, and complete outgoing inspection, serving small university/research prototypes and large industrial orders. Short lead times and dedicated engineers provide rapid setup/corrections and complete homogenization, Hartmann sensing, and light-field reconstruction solutions. This circular-array page states that the company's quadrilateral arrays are widely used in Hartmann sensing, light-field imaging, precision laser processing, CCD coupling, and thermal imaging. Stable process precision/quality and after-sales support have secured long-term research/industry collaboration. The company describes itself as one of few Chinese benchmark suppliers independently developing/mass-producing the full array chain, offering technical, capacity, and after-sales assurance. Image captions: circular-array schematic; pitch schematic; focal-length schematic; circular-microlens microscope test; circular-microlens interferometer test.

Specifications

ParameterValue
Substrate MaterialFused Silica, Silicon, Germanium, Zinc Selenide

Applications

Shack-Hartmann sensing: each microlens subaperture divides the beam and focuses its portion onto a CCD/CMOS spot. A planar wavefront gives reference positions on lens axes; distortion, tilt, or aberration shifts the spots. Algorithms use offsets to reconstruct the full wavefront and detect error. Light-field cameras: each circular microlens spatially samples and independently images object points in its field into corresponding array pixels. Registering intensity and arrangement enables image transfer, multiaperture stitching, or joint phase/intensity reconstruction. Laser homogenization: converts Gaussian or other nonuniform input to a uniform flat-top. Single-array or dual-array schemes, classically MLA1+MLA2, overlap sub-beams by interference or geometric superposition rather than focusing an image, producing rectangular flat-top spots for industrial lasers and lithographic illumination. IR focal-plane coupling: concentrates light on detector elements; focal-plane arrangement and energy concentration provide dense spot arrays, parallel lithography, or tailored target irradiance.

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Supplier Information

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Zhilanweina
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Chengdu Zhilan Micro-Nano Technology Co., Ltd. focuses on micro-nano optics, engaging in the design, fabrication, and application of micro-nano optical structures. The company masters continuous-surface micro-optical element processing technology based on grayscale modulation, capable of designing high-performance microlens arrays, diffractive optical elements (DOE), complex field modulation elements, etc. Products include microlens arrays, phase plates, DOEs, gratings, photomasks, etc., which have been applied in space exploration, 3D imaging, optoelectronic measurement, smart home, human-computer interaction, and other fields, cooperating with nearly a hundred domestic institutions. Adhering to the principle of customer first, the company provides professional services in optical design, component processing, system integration, etc.

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