Since when? HF radio has no such shortcomings when you don't take its envelope and try to modulate visual frequencies with it. That's a fool's errand. Not just with HF but VHF and UHF. I suspect the article is actually talking about GHz frequencies. That's just not HF, sorry.
Plasmonic Modulators Directly Convert Terahertz Waves to Optical Signalshackaday.com/2025/04/14/plasmo…
Plasmonic Modulators Directly Convert Terahertz Waves To Optical Signals
A major bottleneck with high-frequency wireless communications is the conversion from radio frequencies to optical signals and vice versa. This is performed by an electro-optic modulator (EOM), whi…Hackaday
