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#photonics

3 posts3 participants0 posts today
Public
Birk Marold

Did anybody try yet to use #fusion360 or a less shitty program to do #CNC work on glass and lenses?

I carefully did try it a few months back on a microscope slide first with a carving tool, which suprizingly worked very well and also with a diamond dust? coated tip. you know these dremel polishing and sanding tools. That also worked pretty well and i was able to carve out a small rectangular chamber on the microscope slide.

What i want to do is to modify the shape of a #lens, specifically a zinc selenide lens for thermal imaging. While it is originally a co2 laser focusing lens it magnifies objects close by quite well but of course i want higher magnification and not pay a fortune for long IR lenses from thorlabs.

As i rather would like to not waste the two lenses i have for testing, i want to simulate first if the shape i want to make would actually work.

I obviously have no previous experience in designing lenses.

any idea or hint is highly welcome!

#diy#thermalvision#optics
Public
Margaret Harris

Two new types of photonic computer chips have been developed that match purely electronic chips in their raw performance. The new chips can be integrated with conventional silicon electronics and could find use in energy-hungry technologies such as #AI.

physicsworld.com/a/photonic-co

Physics World · Photonic computer chips perform as well as purely electronic counterparts, say researchers – Physics WorldNew light-based chips could boost machine leaning
#photonics#science#physics
Public
Universität Jena

With the ‘MetalnfoLab’, the #AbbeCenter of #Photonics at #UniJena is creating a state-of-the-art laser infrastructure to research nanostructured metasurfaces for information processing. Short-pulse and continuous wave laser systems form the core of the laboratory, which is used on an interdisciplinary basis and promotes strategic research approaches with light.

The European Regional Development Fund (EFRE) is supporting the laboratory with 630,000 euros. Thank you for that! 🙏 🇪🇺

Public
MPI for Gravitational Physics

🌟 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 aei.mpg.de/1202212/tunable-hig
📄 onlinelibrary.wiley.com/doi/10 (Open Access)

A graph with two insets. The inset on the left shows a CAD drawing of a metasurface composed of silicon nanocylinders (4 by 4 purple cylinders) on top of a sapphire substrate (grey rectangular slab). The inset on the top right shows an SEM image of the fabricated nanocylinder metasurface, with a 1 μm scalebar. The graph shows the reflectivity of fabricated metasurfaces compared to their theoretical predictions. The reflectivity experimentally measured for the metasurfaces designed with mirror effect at 1550 nm wavelength the experimental reflectivity is presented by a magenta line. The thickness of the lines characterizes the uncontrollable small variation of the signal during the measurements. The black dash-dotted lines correspond to the theoretical simulations. The dashed vertical lines show the spectral positions of the wavelengths, demonstrating the alignment between the experimental and theoretical reflection resonances.
#metasurface#photonics#metamirrors
Public
MPI for Gravitational Physics

🌟 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 aei.mpg.de/1202729/tunable-hig (englisch)
📄 onlinelibrary.wiley.com/doi/10 (Open Access)

A graph with two insets. The inset on the left shows a CAD drawing of a metasurface composed of silicon nanocylinders (4 by 4 purple cylinders) on top of a sapphire substrate (grey rectangular slab). The inset on the top right shows an SEM image of the fabricated nanocylinder metasurface, with a 1 μm scalebar. The graph shows the reflectivity of fabricated metasurfaces compared to their theoretical predictions. The reflectivity experimentally measured for the metasurfaces designed with mirror effect at 1550 nm wavelength the experimental reflectivity is presented by a magenta line. The thickness of the lines characterizes the uncontrollable small variation of the signal during the measurements. The black dash-dotted lines correspond to the theoretical simulations. The dashed vertical lines show the spectral positions of the wavelengths, demonstrating the alignment between the experimental and theoretical reflection resonances.
#metasurface#photonics#metamirrors
Continued thread
Public
Frederic Jacobs

The EU is investing €380M for a photonics pilot factory.

€133M euros are being allocated to production lines in Twente and Brabant in the Netherlands with co-funding of €66M from the national Dutch budget. The Nederlands have the ambition to produce by 2030 100000 wafers annually. Via @marchijnkNRC

nrc.nl/nieuws/2024/11/10/380-m

NRC · EU trekt 380 miljoen euro uit voor proeffabriek fotonische chips, productielijnen komen in Twente en Brabant By Marc Hijink
#Quantum#photonics#ChipsJointUndertaking
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