This paper-thin lens can turn infrared light into visible beams—ushering in a new optical era of ultra-compact, light-bending devices. #Nanotech #Optics #Metasurface

https://geekoo.news/new-metalens-converts-infrared-light-into-visible-vision/

Quantum holograms using polarized light and metasurfaces enable precise control over entangled holographic information.
#Metasurface #Hologram #Quantum #Optics #Science

🔗 Discover more: https://spie.org/news/holograms-with-a-twist-entangling-light-and-information#:~:text=Quantum%20holograms%20using%20polarized%20light%20and%20metasurfaces%20enable%20precise%20control%20over%20entangled%20holographic%20information%2C%20advancing%20practical%20applications%20in%20quantum%20communication%20and%20anti%2Dcounterfeiting%20technologies

Revolutionizing optics: Harvard's bilayer metasurface offers unparalleled control over light, paving the way for advanced imaging and communication technologies. #Optics #Metasurface #Photonics

https://geekoo.news/advancing-optics-the-emergence-of-bilayer-metasurfaces/

🌟 New selected research highlight 🌟

Tunable highly reflective metasurfaces – International team led by @unihannover researchers demonstrate wavelength-selective metamirrors based on sapphire and silicon nanoparticles

Metasurfaces are sheet materials with artificial structures smaller than the electromagnetic wavelength with which they interact. A new study led by researchers at the Institute for Gravitational Physics at @unihannover, Germany, presents the first experimental validation of the feasibility of realizing a reflective metasurface at selected wavelengths. The metasurface presented in this study is based on a single-layer nanoparticle array consisting of silicon cylinders on a sapphire substrate. The fabricated structures have a reflectivity of about 95% (at 1064 nm or 1550 nm), which can be improved by further optimization of the fabrication and characterization processes. This technology has the potential to be used in future gravitational-wave detectors. There, single-layer reflective surfaces mitigate coating thermal noise, an important source of instrumental disturbance.

ℹ️ https://www.aei.mpg.de/1202212/tunable-highly-reflective-metasurfaces
📄 https://onlinelibrary.wiley.com/doi/10.1002/adpr.202400116 (Open Access)

#metasurface #photonics #metamirrors #GravitationalWaveDetectors #research

🌟 Neues Forschungshighlight 🌟

Tunable highly reflective metasurfaces – International team led by @unihannover researchers demonstrate wavelength-selective metamirrors based on sapphire and silicon nanoparticles

Metasurfaces are sheet materials with artificial structures smaller than the electromagnetic wavelength with which they interact. A new study led by researchers at the Institute for Gravitational Physics at @unihannover, Germany, presents the first experimental validation of the feasibility of realizing a reflective metasurface at selected wavelengths. The metasurface presented in this study is based on a single-layer nanoparticle array consisting of silicon cylinders on a sapphire substrate. The fabricated structures have a reflectivity of about 95% (at 1064 nm or 1550 nm), which can be improved by further optimization of the fabrication and characterization processes. This technology has the potential to be used in future gravitational-wave detectors. There, single-layer reflective surfaces mitigate coating thermal noise, an important source of instrumental disturbance.

ℹ️ https://www.aei.mpg.de/1202729/tunable-highly-reflective-metasurfaces (englisch)
📄 https://onlinelibrary.wiley.com/doi/10.1002/adpr.202400116 (Open Access)

#metasurface #photonics #metamirrors #GravitationalWaveDetectors #research

#SGU #TheSkepticsGuideToTheUniverse:
The Skeptics Guide #1006 - Oct 19 2024

Interview with #Christian_Hubicki; From #TikTok: Fake #Spacestation; News Items:
#AI #Common_Sense, #Malnutrition in #Africa, Latest #Starship Launch, New #Metasurface, #Exomoon;
Who's That Noisy; Your Questions and E-mails: Myopia; #Science or Fiction

Webseite der Episode: https://www.theskepticsguide.org/podcast/sgu

Mediendatei: https://traffic.libsyn.com/secure/skepticsguide/skepticast2024-10-19.mp3

'Night vision lenses' could give you power to see in the dark using simple eyeglasses
https://www.livescience.com/technology/night-vision-lenses-could-give-you-power-to-see-in-the-dark-using-simple-eyeglasses #nightvision #lenses #eyeglasses #metasurface #PumpBeam #X—RaySpecs

Augmented reality slims down with #AI and #holograms https://spectrum.ieee.org/augmented-reality-glasses-metasurface "New #AR eyeglasses provide trim, wearable displays that don't cause headaches"; #metasurface #glasses

Full-colour 3D holographic augmented-reality displays with metasurface waveguides https://www.nature.com/articles/s41586-024-07386-0

Referenced link: https://phys.org/news/2023-06-metasurface-enables-strong-coupling-effects.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-06-metasurface-enables-strong-coupling-effects.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1672244350120603649#m

#Metasurface enables strong coupling effects between light and #transitionmetaldichalcogenides @NatureMaterials https://www.nature.com/articles/s41563-023-01580-7 https://phys.org/news/2023-06-metasurface-enables-strong-coupling-effects.html

Referenced link: https://techxplore.com/news/2023-04-non-reciprocal-metasurface-based-magnetic-meta-atoms.html
Discuss on https://discu.eu/q/https://techxplore.com/news/2023-04-non-reciprocal-metasurface-based-magnetic-meta-atoms.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/TechXplore_com/status/1646143638911451136#m

RT by @physorg_com: A non-reciprocal #metasurface based on magnetic meta-atoms @NatureElectron https://www.nature.com/articles/s41928-023-00936-w https://techxplore.com/news/2023-04-non-reciprocal-metasurface-based-magnetic-meta-atoms.html

New selected research highlight: Silicon nanospheres for improved gravitational-wave detection – Important first steps towards a novel mirror coating for precision metrology applications

➡️ https://www.aei.mpg.de/1009039/silicon-nanospheres-for-improved-gravitational-wave-detection

📄 https://www.sciencedirect.com/science/article/pii/S0925346723001908

#metasurface #nanospheres #silicon #GravitationalWaves

New selected research highlight: Silicon nanospheres for improved gravitational-wave detection – Important first steps towards a novel mirror coating for precision metrology applications

➡️ https://www.aei.mpg.de/1009039/silicon-nanospheres-for-improved-gravitational-wave-detection

📄 https://www.sciencedirect.com/science/article/pii/S0925346723001908

#metasurface #nanospheres #silicon #GravitationalWaves

Referenced link: https://phys.org/news/2023-02-metasurface-laser-fiber-cavity-spatiotemporal.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-02-metasurface-laser-fiber-cavity-spatiotemporal.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1628841422408261632#m

#Metasurface enters laser fiber cavity for spatiotemporal mode control @SPIEtweets https://www.spiedigitallibrary.org/journals/advanced-photonics/volume-5/issue-02/026002/Intracavity-spatiotemporal-metasurfaces/10.1117/1.AP.5.2.026002.full https://phys.org/news/2023-02-metasurface-laser-fiber-cavity-spatiotemporal.html

Yesterday we kicked of project #CORE3D (https://www.photonikforschung.de/projekte/kmu-und-start-ups/projekt/core-3d.html), a collaborative research project between mcd - modern camera designs GmbH and Fraunhofer IOF

In this project we will combine refractive and diffractive optics to create industry-scalable #MetaSurface-empowered optical solutions with unprecedented performance.

#EmbraceTheMeta.

Do you care about metasurfaces? Well, we've made a big leap in #metasurface technology! Our new conformable metasurface can show two separate images just by changing its shape. with @andreadifalco5 @mmwave_EPR Learn more: bit.ly/3XoHbaz #OpenScience #photonics

#Metamaterials use 3d structure to give materials special and exotic properties that do not exist in the constituent materials.

Of all their important applications, the creation of artificial tongues is a particularly eye-catching breakthrough.

📽️ https://www.youtube.com/watch?v=ELhGIymUQnw
#metasurface #sensors

Referenced link: https://phys.org/news/2022-09-metasurface-images-illumination.html
Discuss on https://discu.eu/q/https://phys.org/news/2022-09-metasurface-images-illumination.html

Originally posted by Phys.org / @physorg_com@twitter.com: https://twitter.com/physorg_com/status/1574840828736016406#m

#Metasurface engineered to create three different images depending on illumination @opticalsociety @OpticalSociety https://opg.optica.org/oe/viewmedia.cfm https://phys.org/news/2022-09-metasurface-images-illumination.html

New Light Field Camera Can Focus Up-Close and Far Away Simultaneously

#news #technology #depthoffield #lens #lightfieldcamera #metalens #metasurface #nanophotonic #research

Compact Wide-Angle Metalens Camera Eliminates Bulky Glass Optics

#equipment #mobile #technology #compactcamera #highquality #machinelearning #metalens #metalenses #metaoptics #metasurface #metasurfaces #nanooptic #nanotechnology #neuralnanooptic #submicron #tinycamera #wideangle

Researchers Shrink High-Res Camera Down to the Size of a Grain of Salt

Researchers from the University of Princeton and the University of Washington have developed a high-resolution, full-color camera that is the size of a grain of salt that is the next generation of metasurface technology.

Tiny cameras have long been thought to have the potential to see problems in the human body and help scientists and medical professionals treat various illnesses, but past implementations of metasurface-based compact cameras have only been able to produce fuzzy, distorted images with limited fields of view.

"While sensors with submicron pixels do exist, further miniaturization has been prohibited by the fundamental limitations of conventional optics," the researchers say. "Traditional imaging systems consist of a cascade of refractive elements that correct for aberrations, and these bulky lenses impose a lower limit on camera footprint. A further fundamental barrier is a difficulty of reducing focal length, as this induces greater chromatic aberrations."

But these researchers appear to have overcome these issues. In a paper published on Nature and summarized by Princeton University, the team shows that it was able to produce what they describe as "crisp" full-color photos that are "on-par" with a conventional compound camera that is 500,000 times larger. The team is calling the new camera a "neural nano-optic" system.

The metasurface is studded with 1.6 million cylindrical posts that are each roughly the size of an HIV virus. Each post has unique geometry and functions like an optical antenna, Princeton explains. These unique cylinders combine with machine learning algorithms that interpret how light hits each and combine the data together to produce high-quality images.

Below is a figure from the paper that shows what the neural nano-optic camera can capture compared to previous methods.

"We perform comparisons against a traditional hyperbolic meta-optic designed for 511 nm and the state-of-the-art cubic meta-optic from Colburn et al," the researchers explain. "Additional experimental comparisons against alternative single-optic and meta-optic designs are shown in Supplementary Note 11. Ground truth images are acquired using a six-element compound optic that is 550,000× larger in volume than the meta-optics. Our full computational reconstruction pipeline runs at real-time rates and requires only 58 ms to process a 720 px × 720 px RGB capture."

Previous micro-sized image example (left) versus the new neural nano-optics camera result (right). | Via Princeton Engineering

The researchers are now working to add more computational abilities to the camera, and beyond improving the image quality they would like to add the capability for object detection and sensing that would be relevant in medicine and robotics.

"We could turn individual surfaces into cameras that have ultra-high resolution, so you wouldn't need three cameras on the back of your phone anymore, but the whole back of your phone would become one giant camera," Felix Heide, the study's senior author and an assistant professor of computer science at Princeton says. "We can think of completely different ways to build devices in the future."

_Image credits: Header image from the research team, via Princeton University _

#equipment #news #technology #compactcamera #machinelearning #metalens #metaoptics #metasurface #metasurfaces #nanooptic #nanotechnology #neuralnanooptic #submicron #tinycamera