Tootfinder

Tilbage på Wasa station for juleaftensdag -
Jeg skal snakke med @andreasnyholm.bsky.social på TV2 news cirka kl12.15 om vores #iQ2300 projekt og hvad det er jeg egentlig gŸre i Antarktis lige nu, hvis i er ikke ellers optaget og synes det lyder interessant..

it is funny to me that the metaphor for "installing software" is still unboxing an optical disc, despite nobody in the last 15 years actually shipping software that way

#Zhongmou wins U.S. #FDA clearance for China's first optogenetic human trials https://www.linkedin.com/p…

Zhongmou Wins U.S. FDA Clearance for China’s First Optogenetic Human Trials
ZM-02 becomes the first China-origin optogenetic therapy authorized for U.S.

🪮 New light-powered gears fit inside a strand of hair
#optics

New light-powered gears fit inside a strand of hair
Researchers at the University of Gothenburg have made light-powered gears on a micrometer scale. This paves the way for the smallest on-chip motors in history, which can fit inside a strand of hair. The research is published in the journal Nature Communications.

High-precision luminescence cryothermometry strategy by using hyperfine structure
Marina N. Popova, Mosab Diab, Boris Z. Malkin
https://arxiv.org/abs/2511.19088 https://arxiv.org/pdf/2511.19088 https://arxiv.org/html/2511.19088
arXiv:2511.19088v1 Announce Type: new
Abstract: A novel, to the best of our knowledge, ultralow-temperature luminescence thermometry strategy is proposed, based on a measurement of relative intensities of hyperfine components in the spectra of Ho$^{3 }$ ions doped into a crystal. A $^{7}$LiYF$_4$:Ho$^{3 }$ crystal is chosen as an example. First, we show that temperatures in the range 10-35 K can be measured using the Boltzmann behavior of the populations of crystal-field levels separated by an energy interval of 23 cm$^{-1}$. Then we select the 6089 cm$^{-1}$ line of the holmium $^5I_5 \rightarrow ^5I_7$ transition, which has a well-resolved hyperfine structure and falls within the transparency window of optical fibers (telecommunication S band), to demonstrate the possibility of measuring temperatures below 3 K. The temperature $T$ is determined by a least-squares fit to the measured intensities of all eight hyperfine components using the dependence $I(\nu) = I_1 \exp(-b\nu)$, where $I_1$ and $b = a\nu \frac{\nu}{kT}$ are fitting parameters and a accounts for intensity variations due to mixing of wave functions of different crystal-field levels by the hyperfine interaction. In this method, the absolute and relative thermal sensitivities grow at $T$ approaching zero as $\frac{1}{T^2}$.and $\frac{1}{T}$, respectively. We theoretically considered the intensity distributions within hyperfine manifolds and compared the results with experimental data. Application of the method to experimentally measured relative intensities of hyperfine components of the 6089 cm$^{-1}$ PL line yielded $T = 3.7 \pm 0.2$ K. For a temperature of 1 K, an order of magnitude better accuracy is expected.
toXiv_bot_toot

#Mural na Wasserwerku w #Görlitz.
https://www.openstreetmap.org/?mlat=51.140…

Sora, which is fun and simple to use, shows that OpenAI remains good at creating viral products, unlike Meta, whose Vibes video feed feels half-baked and obtuse (M.G. Siegler/Spyglass)
https://spyglass.org/openai-sora-2-app/

Sora Soars
Another viral product hit for OpenAI, this time in video...

Non-invasive optical quantification of methanol in bottled spirits
An\'e Kritzinger, George O. Dwapanyin, Ralf Mouthaan, Graham D. Bruce, Kishan Dholakia
https://arxiv.org/abs/2510.06593

Non-invasive optical quantification of methanol in bottled spirits
Food and beverage contamination poses a persistent global threat. A prime example is the presence of methanol in counterfeit or illicit spirits, causing severe and often fatal poisoning worldwide. Rapid, non-destructive, and on-site screening methods capable of molecular analysis directly through commercial packaging are therefore urgently needed for quality control and consumer safety. Here, we introduce a non-invasive optical approach based on Raman spectroscopy that judiciously combines wave…

All-optical nonlinear phase modulation in open semiconductor microcavities
Fedor A. Benimetskiy, Paul M. Walker, Anthony Ellul, Oleksandr Kyriienko, Martina Morassi, Aristide Lema\^itre, Tommi Isoniemi, Maurice S. Skolnick, Jacqueline Bloch, Sylvain Ravets, Dmitry N. Krizhanovskii
https://arxiv.org/abs/2510.04789

All-optical nonlinear phase modulation in open semiconductor microcavities
We report a significant advancement in ultra low power light-by-light phase modulation using open semiconductor microcavities in the strong light-matter coupling regime. We achieve cross-phase modulation of up to 247$\pm$17 mrad per particle between laser beams attenuated to single-photon average intensities. This breakthrough extends the potential for quantum information processing and nonlinear quantum optics in strongly coupled light-matter systems, setting a new benchmark in the field witho…