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Meta has a new post talking a bit more about the silicon carbide waveguides used in the Orion AR glasses. Funny they mentioned lithium niobate, I wonder how much they suffered (or put to good use) from the birefringence, the pyroelectric effect, the goddamn lithium that diffuses everywhere...

21,191 Aufrufe • vor 1 Jahr •via X (Twitter)

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outside five sigmavor 1 Jahr

Crystal Clear: Our Silicon Carbide Waveguides & the Path to Orion’s Large FoV

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outside five sigmavor 1 Jahr

Mandatory mention of this paper from Jacob Khurgin since we are talking about going after higher refractive index

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outside five sigmavor 1 Jahr

And this work to show the power of pyroelectric effect

Profilbild von outside five sigma
outside five sigmavor 1 Jahr

I'd never wish to reduce my sensory spectrum but oh wouldn't it be nice if we can't see below ~530 nm, and Gallium Phosphide (GaP) would be transparent with a refractive index of ~3.3! Optical constants of GaP

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STATvor 1 Jahr

When patents for name brand medicines expire, the price of that medicine drops significantly as generic versions enter the market, but that process can take a while. Watch a new video in STAT's 'Behind the Counter' series:

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Michelle C. Hauervor 1 Jahr

Lithium Niobate. Does exactly what you want and all the things you don’t.

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outside five sigmavor 1 Jahr

lol so accurate, plus often not exactly what you want 😂

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bubble boi in NY 🗽vor 1 Jahr

What’s special about lithium niabate ?

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outside five sigmavor 1 Jahr

Maybe I should make a thread about it, but it's the go to material for EO modulators for decades, converting electrical signals from computers to optical signals in fibers so they could network in long range and high speed. About a bit more than 10 years ago people figured out how to make thin film of it on wafers, and since then it's been getting hotter and hotter for photonic circuits. In their case it is because of its higher refractive index ~2.3 compared to glass ~1.5, and you could make waveguides with more states of light in it and larger FOV. But SiC is even higher ~2.6 so that's what they end up using.

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quadratic formvor 1 Jahr

Also, when I hear lithium niobate, doesn’t this mean much of this is custom made?

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outside five sigmavor 1 Jahr

“It was a huge investment, and we established the whole pipeline there. The tooling was custom-made for us by our partners, and the process was developed in-house in Meta, though our systems are research-grade because there were no manufacturing-grade systems out there. We worked with a manufacturing partner to develop manufacturing-grade slant etch tooling and processes. And now that we’ve shown what’s possible with silicon carbide, we want others in the industry to start making tools of their own.”

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Valerie Anne Smith

535,352 Aufrufe • vor 10 Monaten

Does the world have enough lithium to power all the electric vehicles and stationary batteries needed to transition the world to 100% clean, renewable energy and storage for everything? The answer is yes. In 2025, the USGS increased its estimate of world lithium resources over land by 30%, to 150 million tons, with the U.S. having the largest resource, 30 million tons, followed by Argentina, Bolivia, Chile, Australia, and China. How much lithium is this? The world has 1.1 billion passenger cars and 375 million trucks and buses. Replacing these requires about 47 million tons of lithium -- 9 million tons for the cars and 38 million tons for the trucks and buses. That’s only 31 percent of the 2025 known lithium resources, and keep in mind, the known resources grow each year as people look for more lithium. What is more, lithium stays in a vehicle during a battery’s 15 to 25-year life. At the end of the battery’s life, the battery is recycled or re-used for stationary electricity storage, so the mining is one-time. For stationary electricity storage itself, less than one-tenth the lithium, 2 to 4 million tons, is needed worldwide than is needed for vehicles. As such, current lithium resources are over three times those needed for vehicles plus storage. Also, many other battery types now exist that don’t use lithium. In sum, there is no shortage of lithium to transition the world to 100% clean, renewable energy and storage for everything. More info Video:

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