Harnessing the power of polarization
Not far from where Edwin Land — the inventor of the Polaroid camera — made his pioneering discoveries about polarized light, researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) are continuing to unlock the power of polarization.
Recently, a team of researchers led by Federico Capasso, the Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering, encoded multiple holographic images in a metasurface that can be unlocked separately with differently polarized light.
This advancement could improve holograms for anti-fraud protection and entertainment, as well as offer more control over the manipulation and measurement of polarization.
The research was published in Physical Review Letters.
“The novelty of this type of metasurface is that for the first time we have been able to embed vastly different images that don’t look at all like each other — like a cat and a dog — and access and project them independently using arbitrary states of polarization,” said Capasso, the senior author of the paper.
Polarization is the path along which light vibrates. Previous research from the Capasso lab used nanostructures sensitive to polarization to produce two different images encoded in the metasurface. However, those images were dependent on one another, meaning both were created but only one appeared in the field of vision.
The metasurface made of titanium dioxide, a widely available material, consists of an array of polarization-sensitive pillars — also called nanofins — that redirect the incident light. Unlike previous arrays, which were uniform in size, these nanofins vary in orientation, height and width, depending on the encoded images.
“Each nanofin has different, precisely controllable polarization properties,” said Noah Rubin, co-first author of the paper and graduate student in the Capasso Lab. “You use this library of elements to design the encoded image.”
Different polarizations read different elements.
“This metasurface can be encoded with any two images, and unlocked by any two polarizations, so long as they are perpendicular to each other,” said Rubin. “You can also embed different functionalities. It can be a lens for one polarization and if you go to a different polarization, it can be a hologram. So, this work is general statement about what can be done with metasurfaces and enables new optics for polarization.”
It allows you to compress a number of functionalities, which would normally spread over several components, and put them all in a single optical element.Tweet This
“This is another powerful example of metasurfaces,” said Capasso. “It allows you to compress a number of functionalities, which would normally spread over several components, and put them all in a single optical element.”
The Latest on: Holograms
via Google News
The Latest on: Holograms
- German circus swaps real animals for hologramson February 2, 2020 at 7:30 am
A German circus which stopped using real-life animals in its performances has welcomed them back into the ring three decades later, this time as holograms. Circus Roncalli, which was founded in 1976, ...
- Newly Published Visiongain Report: Security Paper Market Report 2019-2029on January 31, 2020 at 2:55 am
Forecasts by Component (Substrates, Watermarks, Threads and Holograms), by Application (Bank Notes, Passports, Identity Cards, Certificates, Legal and Government Documents, Cheques and Stamps) Plus ...
- Pharmaceutical Anti-Counterfeiting Technologies Market to Record an Exponential CAGRon January 30, 2020 at 2:45 am
According to a new report published by Allied Market Research, titled, "Pharmaceutical Anti-Counterfeiting Technologies Market by Product (Barcodes, Radiofrequency Identification (RFID), Holograms/OVD ...
- Holocaust survivors’ testimony will live on as hologramson January 28, 2020 at 9:45 am
Attendees at the Holocaust Remembrance Day ceremony in Ottawa hold up "We Remember" signs. Seventy-five years after the liberation of Auschwitz, the 27th of January remains a day to remember, to ...
- This tiny LiDAR sensor lets you control your TV, laptop, or projector (or any display) with gestureson January 28, 2020 at 8:20 am
It sounds a little counterintuitive, but the Glamos is a ridiculously tiny little device that creates a LiDAR field in mid-air that you can swipe through, sort of similar to how Tony Stark interacted ...
- Will Holograms Gonna Be A Thing In Future?on January 28, 2020 at 6:52 am
That day is not so far when the dream of real holograms will actually become a reality. Scientists all over the world have come up with new and innovative ways, latest advance technologies to create ...
- Levi's® Lounge x Alliance Francaise Bombay present The FKBass Holograms Projecton January 27, 2020 at 10:50 am
In partnership with Levi's Lounge and the French Institute in India, Alliance Française de Bombay brings you the unique concert, we bring you the unique concert FKBass Holograms featuring the FKBass - ...
- The digital holography market is projected to reach USD 5.4 billion by 2024 from USD 2.2 billion in 2019; growing at a CAGR of 19.8%on January 26, 2020 at 11:59 pm
New York, Jan. 27, 2020 (GLOBE NEWSWIRE) -- Reportlinker.com announces the release of the report "Digital Holography Market by Offering, Application, Vertical, Technique, Process, Region - Global ...
- How 3D holograms and AI are preserving Holocaust survivors' storieson January 26, 2020 at 1:17 am
This new project, however, goes much further than simple recordings. Interactive hologram Using proprietary technology, the USC initiative employs machine learning and artificial intelligence to ...
via Bing News