Owing to the increase in the time people spend indoors, coupled with the pervasiveness of
high-performance smart devices, the importance of indoor positioning techniques has …

Generally, the linear motion between the source of a wave and an observer leads to a linear
Doppler effect. It is associated with the linear momentum of the wave. For electromagnetic …

The Doppler effect is a universal wave phenomenon that has spurred a myriad of
applications. In early manifestations, it was implemented by interference with a reference …

Gratings which are in apparent motion reveal some startling properties for classical
radiation, especially for luminal gratings traveling at or around the speed of light. We show …

Reciprocity is a fundamental principle of wave physics related to time-reversal symmetry.
Nonreciprocal wave behaviors have been pursued for decades because of their great …

Research on breaking time-reversal symmetry to realize one-way wave propagation is a
growing area in photonic and phononic crystals and metamaterials. In this Letter, we present …

Multiplexing technology with increased information capacity plays a crucial role in the realm
of acoustic communication. Different quantities of sound waves, including time, frequency …

A longstanding pursuit in information communication is to increase transmission capacity
and accuracy, with multiplexing technology playing as a promising solution. To overcome …

In the recent decade, the rotational Doppler effect has garnered considerable attention for
stimulating the development of applications such as rotational Doppler velocity and …

In 1971, Zel'dovich predicted that quantum fluctuations and classical waves reflected from a
rotating absorbing cylinder will gain energy and be amplified. This concept, which is a key …