Abstract: This article presents an efficient synthesis method for generating vortex beams based on donut-shaped orbital angular momentum (OAM) metasurfaces. It not only allows one to synthesize the ...

In a breakthrough that challenges conventional physics, scientists have confirmed the existence of “second sound” — a ...

MIT researchers observe a “second wave” of heat in superfluid helium, confirming that heat propagates like sound.

As the communication range increases, turbulence becomes a significant atmospheric process that affects the propagation of optical waves. This paper presents a more accurate NLOS channel model by ...