German researchers use 3D printing to create the world's smallest lens, which is only twice the size of human hair. The researchers claim that the miniature lens is expected to create a salt-sized camera that will bring life to medical imaging, covert surveillance, robotics and drone technology...
In order to achieve high precision in laminate manufacturing, researchers at the University of Stuttgart in Germany use ultrashort laser pulses – below 100 femtoseconds (fs) at 785 nm, in sub-micron (um) levels. The accuracy of the local hardening photoresist.
The researchers used a microscope to directly focus the laser pulse onto a liquid photoresist (on a glass substrate or fiber tip).
After exposure, the unexposed photoresist is then washed away with a solvent to leave a hardened transparent polymer. This allows researchers to design complex optical lens stacks, including common spherical lenses, parabolic or aspheric lenses.
Timo Gissibl, a Ph.D. student at the University of Stuttgart, directly prints a miniature lens with a diameter of 125 μm at the front end of the fiber, which can be used to achieve a miniaturized endoscope. 20160817 microlens NT01P1 Color SEM image of a miniature triple lens fabricated directly on the fiber.
Timo Gissibl also prints surface fibers and micro-objects directly onto CMOS imaging chips to create extremely small sensors with integrated optics. 20160817 microlens NT01P2 Regularly arranged doublets are fabricated directly on CMOS image sensors
Researchers hope to use this optical lens to design smaller, lighter cameras for drones and robots.
Such miniature lenses can also be applied to lighting systems, including light emitting diode (LED) applications where light must be focused in a particular direction. Using this layered manufacturing approach, the researchers claim that from conception to finished product, it takes less than a day to develop a physical prototype.
The program is supported by the Spitzenforschung cutting-edge research project at Baden-Wurttemberg Stiftung. The high-precision femtosecond 3D printer was created by Nanoscribe (a startup founded by KIT researchers).
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