Tiny antenna enables portable biomedicine, food analysis, and other nano- and terahertz technologies

https://techxplore.com/news/2022-02-tiny-antenna-enables-portable-biomedicine.html

"You put a drop between the two antennas. The transmitter sends THz waves to the receiver, which picks up their modulation by the substance undergoing analysis—in this case milk—to infer its composition. But remember: THz radiation is also good for wireless communication, so the beauty of this setup is that this same antenna can also relay the analysis results to a smartphone or wherever it is you want them"