The focal length of a lens means that a camera has to have a certain thickness - or so we might think. Insect eyes show that this need not be the case: A camera chip based on the compound-eye principle can be used for person recognition and is as thin as paper.
If people were insects, books on optics would certainly look different. The camera illustrated as the technical equivalent next to a cross-section of the eye with just one lens, one iris and one retina would not be of the conventional type. A compound camera would have many hundreds of individual eyes. Each light-sensitive unit, consisting of a lens and a photocell, would capture a narrow segment of the environment. All the images together form the complete picture. An insect’s compound eye will never achieve a particularly high optical resolution, but the principle according to which it registers images does possess some advantages, and if these were incorporated in a camera it would be very flat and could cover a wide field of view.
It was precisely these advantages which inspired research scientists at the Fraunhofer Institute for Applied Optics and Precision Engineering IOF to develop their ultra-flat camera system. “Our latest prototypes are thinner than 0.4 millimeters,” emphasizes Andreas Bräuer, who is in charge of the Microoptics unit in Jena. “You can gain a real sense of how thin that is by picking up three sheets of carbon paper between your fingers.” Cameras incorporating conventional “human-eye” optics - such as those used in mobile phones - are at best no thinner than seven millimeters.
Johannes Ehrlenspiel | alfa
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19.10.2016 | University of Waterloo
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
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COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
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'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
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