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Faraon, assistant professor of applied physics and materials science in Caltech's Division of Engineering and Applied Science, collaborated with Caltech postdoctoral researcher Amir Arbabi and Seunghoon Han from Samsung Electronics to develop the lens system. Their work was published in Nature Communications on November 28.

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Direct light is suitable for where we work or pay great attention, such as homes, offices, shops and other workplaces. Direct light falls on specific objects in a certain direction and we need it when working at home, conducting a meeting in the office and assembling a product in a factory, etc. A light fixture with directional light near the workplace is important since it improves visibility and concentrates the light to exactly where we need it.

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Engineers at Caltech have developed a system of flat optical lenses that can be easily mass-produced and integrated with image sensors, paving the way for cheaper and lighter cameras in everything from cell phones to medical devices.

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The Focus LED light system enhances visual comfort. No hot-spot and no glare, because the multi-lens design of the lamp gives a bright yet even light spot.

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Their article is titled "Miniature optical planar camera based on a wide-angle metasurface doublet corrected for monochromatic aberrations." Additional coauthors at Caltech are graduate students Ehsan Arbabi, Seyedeh Mahsa Kamali, and Yu Horie. This research was funded by Samsung Electronics, the Defense Advanced Research Projects Agency, the National Science Foundation, and the Department of Energy.

Please take a look at the picture above, the lights fall in a downward direction, forming a hotspot at the center. Here are some examples of direct lights, Downlight is a classic example of a direct light as they only illuminate downwards, and Ceiling light is another light fixture that makes the light to a particular object or area.

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"The way we make lenses hasn't changed much since the time of van Leeuwenhoek. Until now," says Caltech's Andrei Faraon (BS '04), referring to Antonie van Leeuwenhoek, a Dutch scientist and lens-maker who created some of the first microscopes.

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Next, the team plans to integrate these lenses into miniaturized cameras and microscopes, and extend their functionality and operation bandwidth.

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The metasurfaces accomplish the same task using silicon nanoposts, cylinders just 600 nanometers tall and with varying diameters in the hundreds of nanometers. (For scale, a strand of human hair is 100,000 nanometers wide.) Each metasurface is dotted with tens of millions of these posts. Light travels faster through nanoposts with smaller diameters than through nanoposts with larger diameters, so controlling the width of the nanoposts allows the engineers to finely adjust the path of light passing through the metasurface to create flat lenses.

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Direct light is created from a light fixture that concentrates all light in a certain direction. This type of light is used to emphasize and highlight a certain area or object.

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Flat, lightweight, and cheap lenses are in demand for various consumer electronics equipped with cameras, or medical devices such as endoscopes, Faraon says.

The technology relies on stacking two metasurfaces. Metasurfaces are sheets of material whose electromagnetic properties can be altered on demand. In this case, the metasurfaces are dotted with silicon cylinders smaller than a micron across that alter the way light passes through them.

In addition, the lenses can be seamlessly integrated with CMOS (complementary metal-oxide semiconductor) image sensors because they are made using the same materials and fabrication techniques. CMOS image sensors are the tiny chips that underpin digital photography, and were developed at JPL.

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A classical lens made of plastic or glass has a curved shape that bends the path of incoming light toward a single focal point. This is because light travels faster through the thinner glass at the edges of the lens than through the thicker glass at the center.

Vision inspection systems can inspect objects for defects and imperfections, including using AI for surface defects, faulty packaging, and malformed parts.

Early experiments with nanopost metasurfaces yielded lenses whose images were blurry around the edges—like a magnifying glass. However, by coupling two metasurfaces together, each nanopost-side-out, the engineers were able to create a lens system that can capture and focus light from a 70-degree angular range, making the technology useful for the first time in microscope and camera imaging applications.

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"Metasurfaces like these can be easily mass produced, much the way computer chips are," Arbabi says. "That means this could be a cheap and easily scalable way to create tiny lenses just a few millimeters in diameter."

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Focal distance is the distance between the subject you are focusing to the camera sensor. Lenses that can work at close focal distances have higher ...

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Another feature of such lighting is that the indirect light won’t get into your eyes straightly, instead, it bounces off a surface and spreads throughout the space.

Indirect lights diffuse to lighten a wide space. Most of the indirect light fixtures are hidden inside the interior decorations and are used to create ambiance. Besides using more direct light sources, indirect lighting is a smart way to create more light in a space without making the sharp contrasts of light and shadow. Such light illuminates the space with relatively smooth and soft light and will make the space feel bright and warm. In commercial applications such as offices, shops, hotels, or VIP rooms, indirect light is particularly important to illuminate the space and enhance more atmosphere throughout the day.

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Indirect light, besides, is usually used to illuminate a wide space. According to such light, the light diffuses instead of concentrating on the specific area. Thus, the indirect light creates soft and smooth lighting to the entire space.

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Lighting systems have undergone a remarkable transformation in the age of interconnected devices and smart lighting technologies. Smart lighting systems, including Zigbee,…