[HN Gopher] Metasurface antenna to manipulate all fundamental ch...
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       Metasurface antenna to manipulate all fundamental characteristics
       of EM waves
        
       Author : ortusdux
       Score  : 8 points
       Date   : 2023-12-15 21:15 UTC (1 hours ago)
        
 (HTM) web link (www.nature.com)
 (TXT) w3m dump (www.nature.com)
        
       | westurner wrote:
       | "A universal metasurface antenna to manipulate all fundamental
       | characteristics of electromagnetic wave" (2023)
       | 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 wrote:
       | 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 wrote:
       | Similar: "Photonic chip transforms lightbeam into multiple beams
       | with different properties" (2022)
       | https://news.ycombinator.com/item?id=36580151 :
       | 
       | "Universal visible emitters in nanoscale integrated photonics"
       | (2022)
       | https://opg.optica.org/optica/fulltext.cfm?uri=optica-10-7-8...
       | 
       | Though maybe also,
       | 
       | "Electrons turn piece of wire into laser-like light source"
       | (2023) 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
        
       | aappleby wrote:
       | 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".
        
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       (page generated 2023-12-15 23:02 UTC)