Scientists at Harvard University, more precisely physicists, have successfully developed an ultra-thin lens with a thickness of only 60 nanometers, which is thinner than a piece of paper, similar to human hair and more shocking. Yes, this will be a lens without distortion at all.
It has been an indisputable fact that imaging technology has been constrained by the development of glass lenses for centuries, and even the latest fiber optic technology cannot escape the limitations of materials. But recently, a joint team of several senior researchers in engineering and applied physics at Harvard University tried to break this tradition. They intend to make a set of lenses that are completely free of distortion.
The principle of this lens is to cover the surface with a layer of liquid silicon "golden antenna"-a V-shaped structure, these antennas can collect light, store light for a short time, and then emit the light in a new direction. In addition to its almost no volume, its advantage also has a more important feature-no distortion:
"The flat lens eliminates the optical distortion of the traditional wide-angle lens, such as the fisheye effect. Astigmatism and coma also do not exist, so its imaging or signal is very accurate, and it does not require complicated correction techniques.
Chief scientist Francesco Aieta said that the technology may one day "replace all lenses in all optical systems with a flat surface."
If this technology can be mass-produced in the future, it will greatly improve the difficulty of balancing the volume and image quality of the camera in the design process.
The research team created a brand new 60-nanometer thick silicon lens, and then etched tiny gold-plated antennas on the silicon surface. Because the overall structure and scale are in the nanometer range, the structure of the lens is thinner than the wavelength of light. Each gold-plated antenna is a micro-resonator, and the gold-plated antenna on the surface of the silicon lens has different types of gradients. Therefore, when the light enters, it can be effectively bent. From the traditional optical design, it is the phase shift between the silicon lens and the air. In such cases, combining the discontinuous gradation of the phase through the interface can theoretically control the reflection and refraction of light. The laws of light reflection and refraction have been greatly challenged.
If the final research translates into productivity, then maybe one day in the future, it may replace the current variety of optical products, from microscopes to telescopes.
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