Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting

Park, Jeonghoon; Lee, Geon; Lee, Dongwoo; Kim, Miso; Rho, Junsuk

doi:10.3390/nano12061019

Open AccessArticle

Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting

by

Jeonghoon Park

^1,†

,

Geon Lee

^1,†,

Dongwoo Lee

¹,

Miso Kim

²

and

Junsuk Rho

^1,3,4,*

¹

Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea

²

School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea

³

Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea

⁴

POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang 37673, Korea

^*

Author to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Nanomaterials 2022, 12(6), 1019; https://doi.org/10.3390/nano12061019

Submission received: 18 January 2022 / Revised: 10 March 2022 / Accepted: 19 March 2022 / Published: 21 March 2022

(This article belongs to the Special Issue Properties and Applications of Metamaterials)

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Abstract

The applicability of piezoelectric energy harvesting is increasingly investigated in the field of renewable energy. In improving harvester efficiency, manipulating elastic waves through a geometric configuration as well as upgrading harvester elements is important. Periodic structures, such as phononic crystals and metamaterials, are extensively employed to control elastic waves and enhance harvesting performance, particularly in terms of wave localization and focusing. In this study, we propose a double-focusing flexural energy harvesting platform consisting of a gradient-index lens and elastic Bragg mirror. Based on the design process, the frequency and time response of the harvesting platform are analyzed. The results indicate that the output voltage and power calculated at 1800

Ω

are 7.9 and 62 times higher than those observed in the bare plate, respectively. Even when compared to the existing gradient-index system, they are 1.5 and 2.3 times higher, respectively. These findings can facilitate the usage of periodic structures as geometric stimuli to significantly enhance harvesting performance.

Keywords: gradient-index lens; elastic Bragg mirror; energy harvesting; piezoelectric energy harvester; double-focusing platform

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MDPI and ACS Style

Park, J.; Lee, G.; Lee, D.; Kim, M.; Rho, J. Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting. Nanomaterials 2022, 12, 1019. https://doi.org/10.3390/nano12061019

AMA Style

Park J, Lee G, Lee D, Kim M, Rho J. Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting. Nanomaterials. 2022; 12(6):1019. https://doi.org/10.3390/nano12061019

Chicago/Turabian Style

Park, Jeonghoon, Geon Lee, Dongwoo Lee, Miso Kim, and Junsuk Rho. 2022. "Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting" Nanomaterials 12, no. 6: 1019. https://doi.org/10.3390/nano12061019

APA Style

Park, J., Lee, G., Lee, D., Kim, M., & Rho, J. (2022). Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting. Nanomaterials, 12(6), 1019. https://doi.org/10.3390/nano12061019

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting

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