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Chen H, Fu Y, Ling L, Hu Y, Li L. Design of Locally Resonant Acoustic Metamaterials with Specified Band Gaps Using Multi-Material Topology Optimization. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3591. [PMID: 39063883 PMCID: PMC11278610 DOI: 10.3390/ma17143591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 07/17/2024] [Accepted: 07/18/2024] [Indexed: 07/28/2024]
Abstract
Locally Resonant Acoustic Metamaterials (LRAMs) have significant application potential because they can form subwavelength band gaps. However, most current research does not involve obtaining LRAMs with specified band gaps, even though such LRAMs are significant for practical applications. To address this, we propose a parameterized level-set-based topology optimization method that can use multiple materials to design LRAMs that meet specified frequency constraints. In this method, a simplified band-gap calculation approach based on the homogenization framework is introduced, establishing a restricted subsystem and an unrestricted subsystem to determine band gaps without relying on the Brillouin zone. These subsystems are specifically tailored to model the phenomena involved in band gaps in LRAMs, facilitating the opening of band gaps during optimization. In the multi-material representation model used in this method, each material, except for the matrix material, is depicted using a similar combinatorial formulation of level-set functions. This model reduces direct conversion between materials other than the matrix material, thereby enhancing the band-gap optimization of LRAMs. Two problems are investigated to test the method's ability to use multiple materials to solve band-gap optimization problems with specified frequency constraints. The first involves maximizing the band-gap width while ensuring it encompasses a specified frequency range, and the second focuses on obtaining light LRAMs with a specified band gap. LRAMs with specified band gaps obtained in three-material or four-material numerical examples demonstrate the effectiveness of the proposed method. The method shows great promise for designing metamaterials to attenuate specified frequency spectra as required, such as mechanical vibrations or environmental noise.
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Affiliation(s)
| | | | - Ling Ling
- State Key Lab of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; (H.C.); (Y.F.); (L.L.)
| | - Yujin Hu
- State Key Lab of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; (H.C.); (Y.F.); (L.L.)
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2
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Zhu C, Bamidele EA, Shen X, Zhu G, Li B. Machine Learning Aided Design and Optimization of Thermal Metamaterials. Chem Rev 2024; 124:4258-4331. [PMID: 38546632 PMCID: PMC11009967 DOI: 10.1021/acs.chemrev.3c00708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 01/31/2024] [Accepted: 02/08/2024] [Indexed: 04/11/2024]
Abstract
Artificial Intelligence (AI) has advanced material research that were previously intractable, for example, the machine learning (ML) has been able to predict some unprecedented thermal properties. In this review, we first elucidate the methodologies underpinning discriminative and generative models, as well as the paradigm of optimization approaches. Then, we present a series of case studies showcasing the application of machine learning in thermal metamaterial design. Finally, we give a brief discussion on the challenges and opportunities in this fast developing field. In particular, this review provides: (1) Optimization of thermal metamaterials using optimization algorithms to achieve specific target properties. (2) Integration of discriminative models with optimization algorithms to enhance computational efficiency. (3) Generative models for the structural design and optimization of thermal metamaterials.
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Affiliation(s)
- Changliang Zhu
- Department
of Materials Science and Engineering, Southern
University of Science and Technology, Shenzhen 518055, P.R. China
| | - Emmanuel Anuoluwa Bamidele
- Materials
Science and Engineering Program, University
of Colorado, Boulder, Colorado 80309, United States
| | - Xiangying Shen
- Department
of Materials Science and Engineering, Southern
University of Science and Technology, Shenzhen 518055, P.R. China
| | - Guimei Zhu
- School
of Microelectronics, Southern University
of Science and Technology, Shenzhen 518055, P.R. China
| | - Baowen Li
- Department
of Materials Science and Engineering, Southern
University of Science and Technology, Shenzhen 518055, P.R. China
- School
of Microelectronics, Southern University
of Science and Technology, Shenzhen 518055, P.R. China
- Department
of Physics, Southern University of Science
and Technology, Shenzhen 518055, P.R. China
- Shenzhen
International Quantum Academy, Shenzhen 518048, P.R. China
- Paul M. Rady
Department of Mechanical Engineering and Department of Physics, University of Colorado, Boulder 80309, United States
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3
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Adibnia E, Mansouri-Birjandi MA, Ghadrdan M, Jafari P. A deep learning method for empirical spectral prediction and inverse design of all-optical nonlinear plasmonic ring resonator switches. Sci Rep 2024; 14:5787. [PMID: 38461205 PMCID: PMC10924975 DOI: 10.1038/s41598-024-56522-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 03/07/2024] [Indexed: 03/11/2024] Open
Abstract
All-optical plasmonic switches (AOPSs) utilizing surface plasmon polaritons are well-suited for integration into photonic integrated circuits (PICs) and play a crucial role in advancing all-optical signal processing. The current AOPS design methods still rely on trial-and-error or empirical approaches. In contrast, recent deep learning (DL) advances have proven highly effective as computational tools, offering an alternative means to accelerate nanophotonics simulations. This paper proposes an innovative approach utilizing DL for spectrum prediction and inverse design of AOPS. The switches employ circular nonlinear plasmonic ring resonators (NPRRs) composed of interconnected metal-insulator-metal waveguides with a ring resonator. The NPRR switching performance is shown using the nonlinear Kerr effect. The forward model presented in this study demonstrates superior computational efficiency when compared to the finite-difference time-domain method. The model analyzes various structural parameters to predict transmission spectra with a distinctive dip. Inverse modeling enables the prediction of design parameters for desired transmission spectra. This model provides a rapid estimation of design parameters, offering a clear advantage over time-intensive conventional optimization approaches. The loss of prediction for both the forward and inverse models, when compared to simulations, is exceedingly low and on the order of 10-4. The results confirm the suitability of employing DL for forward and inverse design of AOPSs in PICs.
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Affiliation(s)
- Ehsan Adibnia
- Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan (USB), P.O. Box 9816745563, Zahedan, Iran
| | - Mohammad Ali Mansouri-Birjandi
- Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan (USB), P.O. Box 9816745563, Zahedan, Iran.
| | - Majid Ghadrdan
- Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan (USB), P.O. Box 9816745563, Zahedan, Iran
| | - Pouria Jafari
- Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan (USB), P.O. Box 9816745563, Zahedan, Iran
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4
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Dai P, Wang Y, Qin Q, Wang J. Band gap of shear horizontal waves for one-dimensional phononic crystals with chiral materials. Phys Rev E 2024; 109:025001. [PMID: 38491652 DOI: 10.1103/physreve.109.025001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 01/05/2024] [Indexed: 03/18/2024]
Abstract
Extensive applications of chiral lattice structures in the field of acoustic wave manipulation and vibration modulation show the effectiveness of chirality route to the design of phononic crystals. However, how and to what extent the material chirality affects the band gap properties of phononic crystals remains unclear. In this study, one-dimensional phononic crystals made of chiral materials is proposed, and a theoretical model of shear horizontal (SH) wave propagation in the chiral phononic crystals is developed based on the noncentrosymmetric micropolar elasticity theory. Through the transfer matrix method, the dispersion relationship of SH wave propagation is obtained and the effects of material chirality on the band-gap properties are investigated. Our work demonstrates that the change of material chirality can significantly affect the dispersion relationship of phononic crystals, leading to the wide band gap and low frequency. In a unit cell, when the chiral coefficients of the two parts have opposite signs but the same magnitude and the chiral directions are consistent with the vibrational direction, it is the most favorable for the phononic crystals to achieve the lowest frequency and widest band gap. This study suggests that the material chirality can be harnessed to effectively tune the band-gap properties of phononic crystals. The present study provides insight for the chirality route to the design of phononic crystals.
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Affiliation(s)
- Pengshuai Dai
- Department of Mechanics, Tianjin University, Tianjin 300054, China
| | - Yanfeng Wang
- Department of Mechanics, Tianjin University, Tianjin 300054, China
| | - Qinghua Qin
- Department of Mechanics, Tianjin University, Tianjin 300054, China
- Department of Materials Science, Shenzhen MSU-BIT University, Shenzhen 518172, China
| | - Jianshan Wang
- Department of Mechanics, Tianjin University, Tianjin 300054, China
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5
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Zhang WP, Li XT, Dai JH, Wen ZQ, Zhou Y, Chen G, Liang G. Methods for extending working distance using modified photonic crystal for near-field lithography. NANOTECHNOLOGY 2023; 35:05LT02. [PMID: 37863077 DOI: 10.1088/1361-6528/ad0591] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 10/20/2023] [Indexed: 10/22/2023]
Abstract
Near-field lithography has evident advantages in fabricating super-resolution nano-patterns. However, the working distance (WD) is limited due to the exponential decay characteristic of the evanescent waves. Here, we proposed a novel photolithography method based on a modified photonic crystal (PC), where a defect layer is embedded into the all-dielectric multilayer structure. It is shown that this design can amend the photonic band gap and enhance the desired high-kwaves dramatically, then the WD in air conditions could be extended greatly, which would drastically relax the engineering challenges for introducing the near-field lithography into real-world manufacturing applications. Typically, deep subwavelength patterns with a half-pitch of 32 nm (i.e.,λ/6) could be formed in photoresist layer at an air WD of 100 nm. Moreover, it is revealed that diversified two-dimensional patterns could be produced with a single exposure using linear polarized light. The analyses indicate that this improved dielectric PC is applicable for near-field lithography to produce super-resolution periodic patterns with large WD, strong field intensity, and great uniformity.
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Affiliation(s)
- Wen-Peng Zhang
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Xiao-Tian Li
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Jin-Hong Dai
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Zhong-Quan Wen
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Yi Zhou
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Gang Chen
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Gaofeng Liang
- Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China
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6
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Wen X, Kang L, Sun X, Song T, Qi L, Cao Y. Topological Design of Two-Dimensional Phononic Crystals Based on Genetic Algorithm. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5606. [PMID: 37629900 PMCID: PMC10456649 DOI: 10.3390/ma16165606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 07/27/2023] [Accepted: 08/02/2023] [Indexed: 08/27/2023]
Abstract
Phononic crystals are a kind of artificial acoustic metamaterial whose mass density and elastic modulus are periodically arranged. The precise and efficient design of phononic crystals with specific bandgap characteristics has attracted increasing attention in past decades. In this paper, an improved adaptive genetic algorithm is proposed for the reverse customization of two-dimensional phononic crystals designed to maximize the relative bandwidth at low frequencies. The energy band dispersion relation and transmission loss of the optimal structure are calculated by the finite-element method, and the effective wave-attenuation effect in the bandgap range is verified. This provides a solution for the custom-made design of acoustic metamaterials with excellent low-frequency bandgap sound insulation or other engineering applications.
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Affiliation(s)
- Xiaodong Wen
- School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China
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7
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Yuan H, Zhang N, Zhang H, Lu C. A Multi-Channel Frequency Router Based on an Optimization Algorithm and Dispersion Engineering. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2133. [PMID: 37513144 PMCID: PMC10386346 DOI: 10.3390/nano13142133] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 07/18/2023] [Accepted: 07/21/2023] [Indexed: 07/30/2023]
Abstract
Integrated frequency routers, which can guide light with different frequencies to different output ports, are an important kind of nanophotonic device. However, frequency routers with both a compact size and multiple channels are difficult to realize, which limits the application of these frequency routers in nanophotonics. Here, a kind of bandgap optimization algorithm, which consists of the finite element method and topology optimization, is proposed to design a multi-channel frequency router. Channels supporting photonic edge states with different frequencies are built through the synthetic dimension of translational deformation. Due to the help of the developed optimization algorithms, the number of channels and output ports can be increased up to nine while maintaining ultracompact device size. The device operates within a working band of 0.585-0.665 c/a, corresponding to 1.504-1.709 μm when the lattice constant is set as 1 μm, covering the telecom wavelength of 1.55 μm. The average crosstalk is about -11.49 dB. The average extinction ratio is around 16.18 dB. Because the bus of the device can be regarded as a part of a topological rainbow, the results show that the structure is robust to fabrication errors. This method is general, which can be used for different materials and different frequency ranges. The all-dielectric planar configuration of our router is compact, robust, and easy to integrate, providing a new method for on-chip multi-channel broadband information processing.
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Affiliation(s)
- Hongyi Yuan
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Nianen Zhang
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Hongyu Zhang
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Cuicui Lu
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
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8
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Qiu Y, Chen S, Hou Z, Wang J, Shen J, Li C. Chiral Metasurface for Near-Field Imaging and Far-Field Holography Based on Deep Learning. MICROMACHINES 2023; 14:789. [PMCID: PMC10143881 DOI: 10.3390/mi14040789] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 03/22/2023] [Accepted: 03/29/2023] [Indexed: 06/29/2023]
Abstract
Chiral metasurfaces have great influence on the development of holography. Nonetheless, it is still challenging to design chiral metasurface structures on demand. As a machine learning method, deep learning has been applied to design metasurface in recent years. This work uses a deep neural network with a mean absolute error (MAE) of 0.03 to inverse design chiral metasurface. With the help of this approach, a chiral metasurface with circular dichroism (CD) values higher than 0.4 is designed. The static chirality of the metasurface and the hologram with an image distance of 3000 μm are characterized. The imaging results are clearly visible and demonstrate the feasibility of our inverse design approach.
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Affiliation(s)
- Yihang Qiu
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
| | - Sixue Chen
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
| | - Zheyu Hou
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
| | - Jingjing Wang
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
| | - Jian Shen
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
| | - Chaoyang Li
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
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9
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Ma J. Phonon Engineering of Micro‐ and Nanophononic Crystals and Acoustic Metamaterials: A Review. SMALL SCIENCE 2022. [DOI: 10.1002/smsc.202200052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Jihong Ma
- Department of Mechanical Engineering University of Vermont Burlington VT 05405 USA
- Materials Science Program University of Vermont Burlington VT 05405 USA
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10
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Jo SH, Yoon H, Shin YC, Choi W, Youn BD, Kim M. L-shape triple defects in a phononic crystal for broadband piezoelectric energy harvesting. NANO CONVERGENCE 2022; 9:29. [PMID: 35705776 PMCID: PMC9200923 DOI: 10.1186/s40580-022-00321-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 06/02/2022] [Indexed: 05/07/2023]
Abstract
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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Affiliation(s)
- Soo-Ho Jo
- Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Institute of Advanced Machines and Design, Seoul National University, Seoul, 08826, Republic of Korea
| | - Heonjun Yoon
- School of Mechanical Engineering, Soongsil University, Seoul, 06978, Republic of Korea
| | - Yong Chang Shin
- Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Wonjae Choi
- Intelligent Wave Engineering Team, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea
| | - Byeng D Youn
- Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
- Institute of Advanced Machines and Design, Seoul National University, Seoul, 08826, Republic of Korea.
- OnePredict Inc, Seoul, 06160, Republic of Korea.
| | - Miso Kim
- School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
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Zhang X, Jia Z, Luo Y, Wang Y, Liu P, Kang Z. A Precisely‐Controlled Multichannel Phononic Crystal Resonant Cavity. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Xiaopeng Zhang
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Zhiyuan Jia
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Yangjun Luo
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Yaguang Wang
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Pai Liu
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Zhan Kang
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
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12
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Jo SH, Shin YC, Choi W, Yoon H, Youn BD, Kim M. Double defects-induced elastic wave coupling and energy localization in a phononic crystal. NANO CONVERGENCE 2021; 8:27. [PMID: 34529160 PMCID: PMC8446117 DOI: 10.1186/s40580-021-00277-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 08/17/2021] [Indexed: 05/23/2023]
Abstract
This study aims to investigate elastic wave localization that leverages defect band splitting in a phononic crystal with double defects through in-depth analysis of comparison of numerical and experimental results. When more than one defect is created inside a phononic crystal, these defects can interact with each other, resulting in a distinctive physical phenomenon from a single defect case: defect band splitting. For a phononic crystal consisting of circular-hole type unit cells in a thin aluminum plate, under A0 (the lowest antisymmetric) Lamb waves, both numerical simulations and experiments successfully confirm the defect band splitting phenomenon via frequency response functions for the out-of-plane displacement calculated/measured at the double defects within a finite distance. Furthermore, experimental visualization of in-phase and out-of-phase defect mode shapes at each frequency of the split defect bands is achieved and found to be in excellent agreement with the simulated results. Different inter-distance combinations of the double defects reveal that the degree of the defect band splitting decreases with the increasing distance due to weaker coupling between the defects. This work may shed light on engineering applications of a multiple-defect-introduced phononic crystal, including broadband energy harvesting, frequency detectors, and elastic wireless power transfer.
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Affiliation(s)
- Soo-Ho Jo
- Department of Mechanical Engineering, Seoul National University, 08826, Seoul, Republic of Korea
- Institute of Advanced Machines and Design, Seoul National University, 08826, Seoul, Republic of Korea
| | - Yong Chang Shin
- Department of Mechanical Engineering, Seoul National University, 08826, Seoul, Republic of Korea
| | - Wonjae Choi
- AI Metamaterial Research Team, Korea Research Institute of Standards and Science, 34113, Daejeon, Republic of Korea
| | - Heonjun Yoon
- School of Mechanical Engineering, Soongsil University, 06978, Seoul, Republic of Korea
| | - Byeng D Youn
- Department of Mechanical Engineering, Seoul National University, 08826, Seoul, Republic of Korea.
- Institute of Advanced Machines and Design, Seoul National University, 08826, Seoul, Republic of Korea.
- OnePredict Inc, 06160, Seoul, Republic of Korea.
| | - Miso Kim
- School of Advanced Materials Science & Engineering, Sungkyunkwan University, 16419, Suwon, Republic of Korea.
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13
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Phononic Bandgap Optimization in Sandwich Panels Using Cellular Truss Cores. MATERIALS 2021; 14:ma14185236. [PMID: 34576459 PMCID: PMC8468891 DOI: 10.3390/ma14185236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 09/02/2021] [Accepted: 09/08/2021] [Indexed: 11/17/2022]
Abstract
The development of custom cellular materials has been driven by recent advances in additive manufacturing and structural topological optimization. These contemporary materials with complex topologies have better structural efficiency than traditional materials. Particularly, truss-like cellular structures exhibit considerable potential for application in lightweight structures owing to their excellent strength-to-mass ratio. Along with being light, these materials can exhibit unprecedented vibration properties, such as the phononic bandgap, which prohibits the propagation of mechanical waves over certain frequency ranges. Consequently, they have been extensively investigated over the last few years, being the cores for sandwich panels among the most important potential applications of lattice-based cellular structures. This study aims to develop a methodology for optimizing the topology of sandwich panels using cellular truss cores for bandgap maximization. In particular, a methodology is developed for designing lightweight composite panels with vibration absorption properties, which would bring significant benefits in applications such as satellites, spacecraft, aircraft, ships, automobiles, etc. The phononic bandgap of a periodic sandwich structure with a square core topology is maximized by varying the material and the geometrical properties of the core under different configurations. The proposed optimization methodology considers smooth approximations of the objective function to avoid non-differentiability problems and implements an optimization approach based on the globally convergent method of moving asymptotes. The results show that it is feasible to design a sandwich panel using a cellular core with large phononic bandgaps.
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14
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Zhang X, Luo Y, Yan Y, Liu P, Kang Z. Photonic Band Gap Material Topological Design at Specified Target Frequency. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100125] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Xiaopeng Zhang
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Yangjun Luo
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
- School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 China
| | - Yi Yan
- School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 China
| | - Pai Liu
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
| | - Zhan Kang
- State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China
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Butkutė A, Jonušauskas L. 3D Manufacturing of Glass Microstructures Using Femtosecond Laser. MICROMACHINES 2021; 12:499. [PMID: 33925098 PMCID: PMC8145601 DOI: 10.3390/mi12050499] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 04/11/2021] [Accepted: 04/12/2021] [Indexed: 12/20/2022]
Abstract
The rapid expansion of femtosecond (fs) laser technology brought previously unavailable capabilities to laser material processing. One of the areas which benefited the most due to these advances was the 3D processing of transparent dielectrics, namely glasses and crystals. This review is dedicated to overviewing the significant advances in the field. First, the underlying physical mechanism of material interaction with ultrashort pulses is discussed, highlighting how it can be exploited for volumetric, high-precision 3D processing. Next, three distinct transparent material modification types are introduced, fundamental differences between them are explained, possible applications are highlighted. It is shown that, due to the flexibility of fs pulse fabrication, an array of structures can be produced, starting with nanophotonic elements like integrated waveguides and photonic crystals, ending with a cm-scale microfluidic system with micro-precision integrated elements. Possible limitations to each processing regime as well as how these could be overcome are discussed. Further directions for the field development are highlighted, taking into account how it could synergize with other fs-laser-based manufacturing techniques.
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Affiliation(s)
- Agnė Butkutė
- Femtika Ltd., Saulėtekio Ave. 15, LT-10224 Vilnius, Lithuania
- Laser Research Center, Vilnius University, Saulėtekio Ave. 10, LT-10223 Vilnius, Lithuania
| | - Linas Jonušauskas
- Femtika Ltd., Saulėtekio Ave. 15, LT-10224 Vilnius, Lithuania
- Laser Research Center, Vilnius University, Saulėtekio Ave. 10, LT-10223 Vilnius, Lithuania
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Inverse Design for Silicon Photonics: From Iterative Optimization Algorithms to Deep Neural Networks. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11093822] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Silicon photonics is a low-cost and versatile platform for various applications. For design of silicon photonic devices, the light-material interaction within its complex subwavelength geometry is difficult to investigate analytically and therefore numerical simulations are majorly adopted. To make the design process more time-efficient and to improve the device performance to its physical limits, various methods have been proposed over the past few years to manipulate the geometries of silicon platform for specific applications. In this review paper, we summarize the design methodologies for silicon photonics including iterative optimization algorithms and deep neural networks. In case of iterative optimization methods, we discuss them in different scenarios in the sequence of increased degrees of freedom: empirical structure, QR-code like structure and irregular structure. We also review inverse design approaches assisted by deep neural networks, which generate multiple devices with similar structure much faster than iterative optimization methods and are thus suitable in situations where piles of optical components are needed. Finally, the applications of inverse design methodology in optical neural networks are also discussed. This review intends to provide the readers with the suggestion for the most suitable design methodology for a specific scenario.
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