Gradient-index phononic crystals for highly dense flexural energy harvesting

被引：64

作者：

Hyun, Jaeyub ^{[1
,2
]}

Choi, Wonjae ^{[1
]}

Kim, Miso ^{[1
]}

机构：

[1] KRISS, Ctr Safety Measurement, 267 Gajeong Ro, Daejeon 34113, South Korea

[2] Univ Calif San Diego, Jacobs Sch, Struct Engn Dept Jacobs, 9500 Gilman Dr, La Jolla, CA 92093 USA

来源：

APPLIED PHYSICS LETTERS | 2019年 / 115卷 / 17期

关键词：

WAVES;

D O I：

10.1063/1.5111566

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Gradient-index (GRIN) refers to a system where the refractive index changes spatially within a specific region. GRIN phononic crystals are capable of not only amplifying the magnitude of wave energies but also controlling the directional nature of the wave propagation, thus offering substantial benefits with regard to energy harvesting (EH) improvements. Here, we propose a systematic design method for GRIN phononic crystals which combine the two-dimensional Reissner-Mindlin plate model and a genetic algorithm for optimization. This design process allows us to design a GRIN phononic crystal with any arbitrary refractive index profile or complex shape of the unit cells. The experimentally verified focusing capability of the GRIN phononic crystals led to the realization of piezoelectric energy harvesting with a maximum areal power density value of up to 240.4 mW/m(2), considerably outperforming the existing non-GRIN-based EH systems without direction controllability. Published under license by AIP Publishing.

引用

页数：5

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