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Phonon lasing—coherent amplification of phonons by stimulated emission—has been achieved in a purely acoustic analog of a three-level laser scheme.
By tracking the tiny displacements of a nanoparticle trapped in an optical tweezer, scientists are able to detect the faintest of acoustic waves.
Cloaking devices made of a composite of soft and hard materials can divert elastic vibrational waves around an object as though it wasn’t there.