4 ms·

Metasurface antenna to manipulate all fundamental characteristics of EM waves

17 points by ortusdux 3y ago

westurner 3y ago
All (reversible adiabatic) quantum operators are unitary transformations of a Bloch sphere. (Basically a unit circle with complex amplitude i as the third coordinate.) How many rotations are needed to form a Church-Turing-Deutsch- complete quantum platform?
westurner 3y ago
"A universal metasurface antenna to manipulate all fundamental characteristics of electromagnetic wave" (2023) https://www.nature.com/articles/s41467-023-40717-9 https://www.nature.com/articles/s41467-023-40717-9 : > Abstract: Metasurfaces have promising potential to revolutionize a variety of photonic and electronic device technologies. However, metasurfaces that can simultaneously and independently control all electromagnetics (EM) waves’ properties, including amplitude, phase, frequency, polarization, and momentum, with high integrability and programmability, are challenging and have not been successfully attempted. Here, we propose and demonstrate a microwave universal metasurface antenna (UMA) capable of dynamically, simultaneously, independently, and precisely manipulating all the constitutive properties of EM waves in a software-defined manner. Our UMA further facilitates the spatial- and time-varying wave properties, leading to more complicated waveform generation, beamforming, and direct information manipulations. In particular, the UMA can directly generate the modulated waveforms carrying digital information that can fundamentally simplify the architecture of information transmitter systems. The proposed UMA with unparalleled EM wave and information manipulation capabilities will spark a surge of applications from next-generation wireless systems, cognitive sensing, and imaging to quantum optics and quantum information science.
westurner 3y ago
Similar: "Photonic chip transforms lightbeam into multiple beams with different properties" (2022) https://news.ycombinator.com/item?id=36580151 https://news.ycombinator.com/item?id=36580151 : "Universal visible emitters in nanoscale integrated photonics" (2022) https://opg.optica.org/optica/fulltext.cfm?uri=optica-10-7-871&id=532411 https://opg.optica.org/optica/fulltext.cfm?uri=optica-10-7-8... Though maybe also, "Electrons turn piece of wire into laser-like light source" (2023) https://news.ycombinator.com/item?id=33490730 https://news.ycombinator.com/item?id=33490730 : "Coherent Surface Plasmon Polariton Amplification via Free Electron Pumping" (2023) https://doi.org/10.21203/rs.3.rs-1572967/v1 https://doi.org/10.21203/rs.3.rs-1572967/v1
aappleby 3y ago
This is really cool stuff. The "eavesdrop-proof" modulation scheme is particularly interesting - I'm curious as to why they didn't also frame that bit as also reducing interference, as it seems like it would allow a base station to steer more beams without "stepping on its own feet".
K0balt 3y ago
Software defined lenses, holographic projection, and many other absolutely wild possibilities come into potential reach with this. It’s going to revolutionize a lot of fields.

17 points by ortusdux 3y ago

All (reversible adiabatic) quantum operators are unitary transformations of a Bloch sphere. (Basically a unit circle with complex amplitude i as the third coordinate.) How many rotations are needed to form a Church-Turing-Deutsch- complete quantum platform?

westurner 3y ago

"A universal metasurface antenna to manipulate all fundamental characteristics of electromagnetic wave" (2023) https://www.nature.com/articles/s41467-023-40717-9 https://www.nature.com/articles/s41467-023-40717-9 : > Abstract: Metasurfaces have promising potential to revolutionize a variety of photonic and electronic device technologies. However, metasurfaces that can simultaneously and independently control all electromagnetics (EM) waves’ properties, including amplitude, phase, frequency, polarization, and momentum, with high integrability and programmability, are challenging and have not been successfully attempted. Here, we propose and demonstrate a microwave universal metasurface antenna (UMA) capable of dynamically, simultaneously, independently, and precisely manipulating all the constitutive properties of EM waves in a software-defined manner. Our UMA further facilitates the spatial- and time-varying wave properties, leading to more complicated waveform generation, beamforming, and direct information manipulations. In particular, the UMA can directly generate the modulated waveforms carrying digital information that can fundamentally simplify the architecture of information transmitter systems. The proposed UMA with unparalleled EM wave and information manipulation capabilities will spark a surge of applications from next-generation wireless systems, cognitive sensing, and imaging to quantum optics and quantum information science.

westurner 3y ago

Similar: "Photonic chip transforms lightbeam into multiple beams with different properties" (2022) https://news.ycombinator.com/item?id=36580151 https://news.ycombinator.com/item?id=36580151 : "Universal visible emitters in nanoscale integrated photonics" (2022) https://opg.optica.org/optica/fulltext.cfm?uri=optica-10-7-871&id=532411 https://opg.optica.org/optica/fulltext.cfm?uri=optica-10-7-8... Though maybe also, "Electrons turn piece of wire into laser-like light source" (2023) https://news.ycombinator.com/item?id=33490730 https://news.ycombinator.com/item?id=33490730 : "Coherent Surface Plasmon Polariton Amplification via Free Electron Pumping" (2023) https://doi.org/10.21203/rs.3.rs-1572967/v1 https://doi.org/10.21203/rs.3.rs-1572967/v1

aappleby 3y ago

This is really cool stuff. The "eavesdrop-proof" modulation scheme is particularly interesting - I'm curious as to why they didn't also frame that bit as also reducing interference, as it seems like it would allow a base station to steer more beams without "stepping on its own feet".

K0balt 3y ago

Software defined lenses, holographic projection, and many other absolutely wild possibilities come into potential reach with this. It’s going to revolutionize a lot of fields.