Article
Acoustics
Nurettin Korozlu, Ahmet Bicer, Done Sayarcan, Olgun Adem Kaya, Ahmet Cicek
Summary: In this study, a two-dimensional phononic crystal linear defect waveguide is used to sort solid particles of different sizes in the air through acoustic radiation force. The proposed approach can be employed in applications where contact-free separation of airborne particles is required.
Article
Crystallography
Edward Muzar, James A. H. Stotz
Summary: This article presents a new structure of a phononic crystal waveguide that gradually increases in width and is capable of waveguiding underneath a micro-structured surface. The optimum waveguide width can be determined by selecting appropriate parameters.
Article
Physics, Multidisciplinary
Sadhna Singh, D. P. Samajdar, Koushik Dutta
Summary: This manuscript presents a comprehensive comparative analysis of six GaAs based nanostructures in terms of their optical performance. These nanostructures exhibit excellent anti-reflection properties and generate a broadband absorption spectrum through efficient photon harvesting. The study investigates the absorption characteristics, optical short circuit current density, electric field, and photogeneration rates of the nanostructures, and finds that optimized geometrical parameters such as filling ratio, spacing, and structural dimensions play a vital role in absorption enhancement. The CNCy nanostructure with a filling ratio of 0.8 and diameter of 240 nm shows the highest optical J(SC) and optical efficiency.
Article
Engineering, Electrical & Electronic
Zihang Gao, Yumei Wen, Huaming Lei, Weibiao Wang, Tao Li, Qiang Xiao, Chao Kong, Yanping Fan
Summary: This article presents a passive wireless weighing sensor based on surface acoustic wave (SAW) technology, which has high sensitivity and good ambient temperature inhibition effect.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Linhao Shi, Weipeng Xuan, Biao Zhang, Shurong Dong, Hao Jin, Jikui Luo
Summary: FBAR-based filters using 2D phononic crystals as acoustic energy reflection layers achieve high reflectivity and wide bandgaps, showing good performance within a broad frequency range. The impedance spectra of such filters are smooth, with minimal spurious modes, demonstrating the potential for wide bandwidth and high power capability.
Article
Acoustics
Ahmet Bicer
Summary: An acoustic add-drop filter is designed using two parallel one-dimensional surface phononic crystals for spoof surface acoustic waves and a circular ring resonator. Both numerical and experimental investigations show consistent results, making it suitable for applications in areas such as ultrasonic sensors, acoustic signal processing, and acoustic logic.
Article
Physics, Applied
Tian-Xue Ma, Quan-Shui Fan, Chuanzeng Zhang, Yue-Sheng Wang
Summary: This paper investigates the acoustic flatbands in phononic crystal defect lattices and finds that the acoustic flatbands can be observed in two bipartite lattices, protected by chiral symmetry. The proposed defect lattices provide a feasible platform for the study of acoustic flatband systems and topological insulators.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
L. Katch, M. Moghaddaszadeh, C. L. Willey, A. T. Juhl, M. Nouh, A. P. Arguelles
Summary: Phononic crystals can develop defects during manufacturing that alter the desired dynamic response and bandgap behavior. This study uses two models to investigate the behavior of defective square unit cells and successfully predicts the impact of defects on the phononic crystal.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Mechanics
D. S. Claro, V. Denis, J. M. Mencik
Summary: A numerical approach is proposed to localize defects in elastic waveguides connected by curved elastic joints. The wave finite element (WFE) method is used to understand wave conversion phenomena and times of flight. The proposed approach enables the identification of the types of waves transmitted through the joint and reflected by the defect.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Chemistry, Analytical
Hanqiang Zhang, Hongliang Wang
Summary: This study presents a theoretical investigation of a layered SAW filter based on a new structure, using modeling software COMSOL Multiphysics. The research focused on the effects of different layers on the performance of SAW devices and designed a longitudinal coupling resonator filter. The findings suggest that the new multilayer structure can be applied to design and manufacture high-frequency and wideband SAW filters with temperature compensation function for operation above the GHz range.
Article
Chemistry, Physical
Liang Zhang, Ting Tan, Zhengyue Yu, Zhimiao Yan
Summary: This study proposes a method to improve the localization of elastic waves in phononic crystals by introducing topological imbalance and semi-enclosed defects. Parametric equations are used to generate lattice unit cells with topological evolution and band gap widening is achieved by increasing topological imbalance. Experimental results show that phononic crystals with semi-enclosed line defects have the best energy confinement effect.
Article
Chemistry, Analytical
Qiaozhen Zhang, Zhenglin Chen, Yanguang Chen, Jiahe Dong, Panliang Tang, Sulei Fu, Haodong Wu, Jinyi Ma, Xiangyong Zhao
Summary: RF SAW resonators are widely used in mobile phones, but the need for an accurate and fast simulation method is urgent. Current limitations in computer memory and speed make it difficult to characterize the behavior of the entire acoustic resonator, especially for SAW resonators with long arrays of IDTs. This paper extends a previously reported PDE model based on 2D-FEM to analyze the periodic structure of SAW resonators, using MOR techniques to maintain computational accuracy.
Article
Chemistry, Physical
Mikhail Marunin, Nataliya Polikarpova
Summary: This paper presents a study of the propagation of elastic waves in two-dimensional phononic crystals based on fused silica. The band structures and acoustic characteristics of the phononic crystals are analyzed, and it is shown that the choice of the crystal's geometry can control the distribution of inverse phase velocities and energy walk-off angles. Three mutually orthogonal acoustic modes are observed in the phononic crystal, regardless of the direction of the acoustic wave's propagation.
Article
Mechanics
Jian-Fei Lu, Ya-Jie Huang
Summary: In this study, a plane wave finite element method for 2D phononic crystals under elastic waves is proposed. FE equations for each plane wave are established using the virtual work principle and conventional finite element procedure. By synthesizing contributions from all plane waves via the DFT method, the dynamic response of the phononic crystal layer to incident waves is determined.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Chemistry, Analytical
Baichuan Li, Qiaozhen Zhang, Xiangyong Zhao, Shaotao Zhi, Luyan Qiu, Sulei Fu, Weibiao Wang
Summary: This article presents a general-purpose model based on piezoelectric constitutive equations combined with perturbation theory and full finite element method (FEM) for efficient and accurate calculation of third-order nonlinear signals in surface acoustic wave (SAW) devices. The model is validated by simulating third-order harmonic (H3) responses and intermodulation distortions (IMD3) in SAW resonators, and the results fit well with experimental data. Furthermore, the generation mechanisms of the third-order nonlinearity in SAW resonators are discussed, and the dominant mechanisms for different nonlinear signals, as well as the relation between electrode materials and H3 peak magnitude, are revealed, providing important guidance for further nonlinear suppression.