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We investigate the dispersion characteristics of locally resonant elasticmetamaterials formed by the erection of pillars on the solid regions in a platepatterned by a periodic array of holes. We show that these solid regionseffectively act as springboards leading to an enhanced resonance behavior bythe pillars when compared to the nominal case of pillars with no holes. Thislocal resonance amplification phenomenon, which we define as the "trampolineeffect", is shown to cause subwavelength band gaps to increase in size by up toa factor of 4. This outcome facilitates the utilization of subwavelengthmetamaterial properties over exceedingly broad frequency ranges.

Trampoline metamaterial: Local resonance enhancement by springboards