  Low-frequency (LF) wireless communications play a crucial role in ensuring
anti-interference, long-range, and efficient communication across various
environments. However, in conventional LF communication systems, their antenna
size is required to be inversely proportional to the wavelength, so that their
mobility and flexibility are greatly limited. Here we introduce a novel
prototype of LF receiving antennas based on optically levitated nanoparticles,
which overcomes the size-frequency limitation to reduce the antenna size to the
hundred-nanometer scale. These charged particles are extremely sensitive to
external electric field as mechanical resonators, and their resonant
frequencies are adjustable. The effectiveness of these antennas was
experimentally demonstrated by using the frequency shift keying (2FSK)
modulation scheme. The experimental results indicate a correlation between
error rate and factors such as transmission rate, signal strength, and vacuum
degree with a signal strength of approximately 0.1V/m and a bit error rate
below 0.1%. This advancement in leveraging levitated particle mechanical
resonators (LPMRs) as LF antennas marks a significant stride in long-distance
communication technology.
