Wave Manipulations by Coherent Perfect Channeling

TL;DR

This paper explores coherent perfect channeling (CPC), demonstrating how two coherent waves can be completely directed into other waveguides with minimal loss, using specially designed subwavelength scatterers, with experimental and theoretical insights.

Contribution

It introduces new scatterers for acoustic CPC, confirms one experimentally, and develops a scattering matrix framework applicable to various scalar waves.

Findings

Discovery of two CPC scatterers for acoustic waves

Experimental confirmation of one scatterer

Development of a scattering matrix formalism

Abstract

We report experimental and theoretical investigations of coherent perfect channeling (CPC), a process that two incoming coherent waves in waveguides are completely channeled into one or two other waveguides with little energy dissipation via strong coherent interaction between the two waves mediated by a deep subwavelength dimension scatterer at the common junction of the waveguides. Two such scatterers for acoustic waves are discovered, one confirmed by experiments and the other predicted by theory, and their scattering matrices are formulated. Scatterers with other CPC scattering matrices are explored, and preliminary investigations of their properties are conducted. The scattering matrix formulism makes it possible to extend the applicable domain of CPC to other scalar waves, such as electromagnetic waves and quantum wavefunctions.