Menger fractal structure with negative refraction and sound tunnelling properties

Materials Research Express - Tập 6 Số 11 - Trang 116211 - 2019
Yu Liu1,2, Wenshuai Xu1,2, Meng Chen1,2, Dongliang Pei1,2, Tao Yang1,2, Heng Jiang1,2, Yuren Wang1,2
1Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
2University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China

Tóm tắt

Abstract

We construct new quasi-three-dimensional fractal acoustic metamaterials based on adoption of the Menger structure, which offers extraordinary parameters such as double-negative properties and a near-zero density. The resulting metamaterials can thus achieve negative refraction, acoustic focusing and sound tunneling. Using the finite element method and the S-parameter retrieval method, the band structures and the effective parameters of these acoustic metamaterials are researched, respectively. The negative refraction property is numerically simulated using a Gaussian beam passing through a double negative prism. A plate lens with a refractive index of n = −1 is constructed to achieve acoustic focusing and the sound tunnelling ability is verified using the near-zero-density metamaterial. The results show that the Menger fractal structures have excellent acoustic properties and are promising for acoustic applications.

Từ khóa


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Thông tin xuất bản

Materials Research Express

Tập 6 Số 11

116211

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