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The quest for wave channeling and manipulation has driven a strong researcheffort on topological and architected materials, capable of propagatinglocalized electromagnetical or mechanical signals. With reference to an elasticstructural grid, which elements can sustain both axial and flexuraldeformations, it is shown that material interfaces can be created withstructural properties tuned by prestress states to achieve total reflection,negative refraction, and strongly localized signal channeling. The achievementof a flat lens and topologically localized modes is demonstrated and tunabilityof the system allows these properties to hold for a broad range of wavelengths.An ingredient to obtain these effects is the use, suggested here and neverattempted before, of concentrated pulsating moments. The important aspect ofthe proposed method is that states of prestress can be easily removed orchanged to tune with continuity the propagational characteristics of themedium, so that a new use of vibration channeling and manipulation is envisagedfor elastic materials.

Prestress tuning of negative refraction and wave channeling from flexural sources