NO NEED FOR COLOR CORRECTION—HARVARD PHYSICISTS’ FLAT OPTICS, USING NANOTECHNOLOGY, GETS IT RIGHT THE FIRST TIME
Most lenses are, by definition, curved. After all, they are named for their resemblance to lentils, and a glass lens made flat is just a window with no special powers.
But a new type of lens created at the Harvard School of Engineering and Applied Sciences(SEAS) turns conventional optics on its head.
A major leap forward from a prototype device demonstrated in 2012, it is an ultra-thin, completely flat optical component made of a glass substrate and tiny, light-concentrating silicon antennas. Light shining on it bends instantaneously, rather than gradually, while passing through. The bending effects can be designed in advance, by an algorithm, and fine-tuned to fit almost any purpose.
With this new invention described today in Science, the Harvard research team has overcome an inherent drawback of a wafer-thin lens: light at different wavelengths (i.e., colors) responds to the surface very differently. Until now, this phenomenon has prevented planar optics from being used with broadband light. Now, instead of treating all wavelengths equally, the researchers have devised a flat lens with antennas that compensate for the wavelength differences and produce a consistent effect—for example, deflecting three beams of different colors by the same angle, or focusing those colors on a single spot.
“What this now means is that complicated effects like color correction, which in a conventional optical system would require light to pass through several thick lenses in sequence, can be achieved in one extremely thin, miniaturized device,” said principal investigator Federico Capasso, the Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering at Harvard SEAS.
Bernard Kress, Principal Optical Architect at Google [X], who was not involved in the research, hailed the advance:
“Google [X], and especially the Google Glass group, is relying heavily on state-of-the-art optical technologies to develop products that have higher functionalities, are easier to mass produce, have a smaller footprint, and are lighter, without compromising efficiency,” he said. “Last year, we challenged Professor Capasso’s group to work towards a goal which was until now unreachable by flat optics. While there are many ways to design achromatic optics, there was until now no solution to implement a dispersionless flat optical element which at the same time had uniform efficiency and the same diffraction angle for three separate wavelengths. We are very happy that Professor Capasso did accept the challenge, and also were very surprised to learn that his group actually solved that challenge within one year.”
The Latest on: Ultra-thin optics
via Google News
The Latest on: Ultra-thin optics
- KITS Eyecare Adds Digital Ultra-Thin Progressive Lens Manufacturing Capabilities For Customerson March 4, 2021 at 4:41 am
Marks entry into US$8 billion market and one of the fastest growing segments in optical KITS digital progressives will launch to customers at a ...
- Contact lenses featuring gold nanoparticles could correct colour blindnesson March 3, 2021 at 7:47 pm
Researchers in Abu Dhabi have infused contact lenses with gold nanoparticles to create a safer way to see colours – lenses that could help people with colour blindness.
- Huawei Launches Huawei × Gentle Monster Eyewear Ii In The Kingdom Of Saudi Arabia: Leading The Way In Smart Audio Fashionon February 28, 2021 at 7:34 am
The semi-open, ultra-thin, large-amplitude speaker effectively ... The newly upgraded Smart Interaction function turns the glasses into your own personal assistant, which offers not only faster ...
- Beat eye fatigue with a pair of glasses from this EyeBuyDirect saleon February 24, 2021 at 4:57 pm
Choose from blue-light blocking lenses, transition lenses, or ultra-thin high-index lenses for a truly customized pair of glasses. Check out EyeBuyDirect's styles here and be sure to use code ...
- Ultra-thin Windows with High Flatnesson February 24, 2021 at 12:58 pm
For the polished optics is often put on pitch plate in polishing processing ... the flatness would become very lower. To get high flatness and ultra thin windows is always challenging for ...
- Ultra-Thin Glass Market Size to Hit US$ 33.45 Billion by 2027on February 23, 2021 at 4:03 pm
Ultra-thin glass refers to a high-end glass that possesses minimum thickness compared to other types of glasses. It is very thin even thinner compared to a single human hair strand hence offer ...
- Reconfigurable all-dielectric metalens with diffraction-limited performanceon February 22, 2021 at 7:55 am
We present a generic design principle enabling binary switching of metasurfaces between arbitrary phase profiles and propose a new figure-of-merit (FOM) tailored for reconfigurable meta-optics.
- 42 Genius Things People Use All The Time & Wish They'd Bought Sooneron February 20, 2021 at 3:02 am
Or, make life easier with no-tie shoelaces, blue light-blocking glasses, and shower drain hair catchers. With so many genius products on the list, it's pretty difficult to go wrong. So whether you ...
- The Worldwide Ultra-thin Glass Industry is Expected to Reach $14.3 Billion by 2025on February 12, 2021 at 1:15 pm
Ultra-thin glasses are widely used in consumer electronics for applications, such as displays and sensors. Properties such as electrical conductivity and sensitivity, transmissivity, and ...
- Global Ultra-thin Glass Market (2020 to 2025) - Shorter Product Lifecycles of Consumer Electronics Presents Opportunitieson February 11, 2021 at 5:28 am
CONTACT: ResearchAndMarkets.com Laura Wood, Senior Press Manager [email protected] For E.S.T Office Hours Call 1-917-300-0470 For U.S./CAN Toll Free Call 1-800-526-8630 For GMT Office ...
via Bing News