Double defects-induced elastic wave coupling and energy localization in a phononic crystal

Jo, Soo-Ho; Shin, Yong Chang; Yoon, Heonjun; Youn, Byeng D.

doi:10.1186/s40580-021-00277-4

Cited by 41 publications

(12 citation statements)

References 62 publications

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“…In accordance with previous work on the experimental validation of the defect-band-splitting phenomenon under elastic waves [31], the degree of defect-band splitting becomes smaller as the distance between the double defects becomes larger.…”

Section: Spacing Between Double Defectssupporting

confidence: 91%

“…line-or point-symmetry) between the strain fields of the double defects. These notable characteristics have been proved in both simulations and experiments [31]. Therefore, this approach allows one double-defect-introduced PnC to be exerted as a mechanical energy amplifier at multiple frequencies as an advanced approach compared to the single-defect approach.…”

Section: Introductionmentioning

confidence: 75%

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Double piezoelectric defects in phononic crystals for ultrasonic transducers

Jo¹,

Lee²,

Yoon³

et al. 2023

J. Phys. D: Appl. Phys.

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Significant prior research has explored elastic wave-energy localization via a defect mode of a phononic crystal (PnC). The integration of defect-introduced PnCs and piezoelectric materials has paved the path for the development of new conceptual products for applications in energy harvesters, wave filters, and ultrasonic sensors. Recently, an attempt has been made to deviate from this paradigm and design an ultrasonic transducer that generates elastic waves. Unfortunately, the previous works have been limited to a single-defect situation. Therefore, as an advanced approach, this work aims to expand the PnC design space into double defects, which will make the ultrasonic transducer useful at several frequencies. As a first step, this study targets longitudinal wave generation. To predict the wave-generation performance, a previous analytical model that was built for energy-harvesting purposes under a single-defect situation is modified to be suitable for the present wave-generation purpose under a double-defect situation. Moreover, two parametric studies are executed to analyze how the output responses change based on changes to the input voltage setting and the spacing between the double defects. We hope that these ultrasonic transducers can be potentially applicable for nondestructive testing in structural health monitoring and ultrasonic imaging in medical science.

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Section: Spacing Between Double Defectssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 75%

Double piezoelectric defects in phononic crystals for ultrasonic transducers

Jo¹,

Lee²,

Yoon³

et al. 2023

J. Phys. D: Appl. Phys.

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“…Considering the inter-distance effects of double defects on energy-localization performance in Ref. [ 50 ], an increase in the inter-distance between the double defects degraded the coupling between them and reduced the splitting degree of the defect bands. The double defects became decoupled after a particular inter-distance.…”

Section: Proposed Phononic Crystals With L-shape Triple Defectsmentioning

confidence: 99%

L-shape triple defects in a phononic crystal for broadband piezoelectric energy harvesting

Yoon

Shin

et al. 2022

Nano Convergence

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This study proposes a phononic crystal (PnC) with triple defects in an L-shape arrangement for broadband piezoelectric energy harvesting (PEH). The incorporation of defects in PnCs has attracted significant attention in PEH fields owing to properties such as energy localization and amplification near the defect. Several studies have been conducted to enhance output electric power of PnC-based PEH systems with single defects. However, it is susceptible to the limitations of narrow bandwidth. Recently, double-defect-incorporated systems have been proposed to widen the PEH bandwidth via defect-band splitting. Nevertheless, the PEH performance rapidly decreases in the frequency range between the split defect bands. The limitations of single- and double-defect-incorporated systems can be resolved by the incorporation of the proposed design concept, called the L-shape triple defects in a PnC. The isolated single defect at the top vertex of the letter ‘L’ compensates for the limitations of double-defect-incorporated systems, whereas the double defects at the bottom vertices compensate for the limitations of the single-defect-incorporated systems. Hence, the proposed design can effectively confine and harvest elastic-wave energy over broadband frequencies while enhancing the application of single and double defects. The effectiveness of the proposed design concept is numerically validated using the finite element method. In the case of a circular hole-type PnC, it is verified that the PnC with L-shape triple defects broadens the bandwidth, and improves the output voltage and electric power compared with those of single- and double-defect-incorporated systems. This study expands the design space of defect-incorporated PnCs and might shed light on other engineering applications of the frequency detector and elastic wave power transfer.

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“…The phononic crystal (PnC) defect results in a high degree of elastic wave localization and provides an efficient way of energy collection in piezoelectric energy harvesting (PEH) devices, which has attracted much attention [1][2][3][4][5][6]. Bandgap is an extraordinary property of PnCs, and elastic waves in the bandgap frequency range decay rapidly and cannot propagate through the PnCs [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%