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Visualizzazione post con etichetta optics. Mostra tutti i post
Visualizzazione post con etichetta optics. Mostra tutti i post

lunedì 17 agosto 2020

# gst: vacuum fluctuations (even in complete darkness)

<< physics is increasingly discovering how our universe is shaped by fluctuations of physical fields, which not only lead to tiny shifts of spectral lines of atoms, but moreover may cause the evaporation of black holes, and are ultimately responsible for the large-scale structure of our universe,  >>

AA  << have now made a large leap toward controlling strongly enhanced vacuum fluctuations much faster than typical timescales of virtual photons. To this end, they created a specialized semiconductor structure in which electrons are extremely strongly coupled to the light fields of tiny antennas designed for the so-called terahertz spectral range. As a result, vacuum fluctuations of light and matter fields participate in the interaction, strongly increasing the presence of virtual photons—even in complete darkness. >>

Understanding vacuum fluctuations in space. University of Regensburg. Aug 10, 2020.


<< The abrupt modification of the vacuum ground state causes spectrally broadband polarization oscillations confirmed by (AA) quantum model. In the future, this subcycle shaping of hybrid quantum states may trigger cavity-induced quantum chemistry, vacuum-modified transport or cavity-controlled superconductivity, opening new scenarios >>

M. Halbhuber, J. Mornhinweg, et al. Non-adiabatic stripping of a cavity field from electrons in the deep-strong coupling regime. Nat. Photonics. doi: 10.1038/ s41566-020-0673-2. Aug 10, 2020.




sabato 28 marzo 2020

# gst: hyperuniform- disordered platforms to create, detect and manipulate light

AA << introduced a hyperuniform-disordered platform to realize near-infrared photonic devices to create, detect and manipulate light. >>

Thamarasee Jeewandara. Hyperuniform disordered waveguides and devices for near infrared silicon photonics. Phys.org. Jan 13, 2020. 

https://m.phys.org/news/2020-01-hyperuniform-disordered-waveguides-devices-infrared.html

AA << show that the hyperuniform-disordered platform enables improved  compactness, enhanced energy efficiency, and better temperature  stability compared to the silicon  photonics devices based on rib and  strip waveguides. >>

Milan M. Milosevic, Weining Man, et al. Hyperuniform disordered waveguides and devices for near infrared silicon photonics. Sci Rep 9, 20338. doi: 10.1038/s41598-019-56692-5. Dec 30, 2019.

https://www.nature.com/articles/s41598-019-56692-5