Search

Your search keyword '"Lü, Cheng"' showing total 219 results
Start Over Author "Lü, Cheng"
219 results on '"Lü, Cheng"'

2. Functional acoustic metamaterial using shortcut to adiabatic passage in acoustic waveguide couplers

Author

Tang, Shuai, Wu, Jin-Lei, Lü, Cheng, Song, Jie, and Jiang, Yongyuan

Subjects
Physics - Optics, Physics - Applied Physics, Quantum Physics
Abstract

Shortcut to adiabatic passage (STAP), initially proposed to accelerate adiabatic quantum state transfer, has been widely explored and applied in quantum optics and integrated optics. Here we bring STAP into the field of acoustics to design compact couplers and functional metamaterial. The space-varying coupling strengths of acoustic waveguides (WGs) are tailored by means of dressed states in a three-level system, accounting for the desirable acoustic energy transfer among three WGs with short length. We show that the acoustic coupler has one-way feature when loss is introduced into the intermediate WG. More uniquely, when the propagation of acoustic wave is designed to mimic a Hadamard transformation, an acoustic metamaterial can be constructed by arraying several couplers, possessing the beam-splitting function and unidirectional, broadband performances. Our work bridges STAP and the acoustic coupler as well as metamaterial, which may have profound impacts on exploring quantum technologies for promoting advanced acoustic devices., Comment: Accepted to publish in Physical Review Applied, including 14 pages and 10 figures

Published
2022

5. Unidirectional acoustic metamaterials based on nonadiabatic holonomic quantum transformations

Author

Wu, Jin-Lei, Tang, Shuai, Wang, Yan, Wang, Xiaosai, Han, Jin-Xuan, Lü, Cheng, Song, Jie, Su, Shi-Lei, Xia, Yan, and Jiang, Yongyuan

Subjects
Physics - Classical Physics, Physics - Applied Physics, Quantum Physics
Abstract

Nonadiabatic holonomic quantum transformations (NHQTs) have attracted wide attention and have been applied in many aspects of quantum computation, whereas related research is usually limited to the field of quantum physics. Here we bring NHQTs into constructing a unidirectional acoustic metamaterial (UDAM) for shaping classical beams. The UDAM is made up of an array of three-waveguide couplers, where the propagation of acoustic waves mimics the evolution of NHQTs. The excellent agreement among analytical predictions, numerical simulations, and experimental measurements confirms the great applicability of NHQTs in acoustic metamaterial engineering. The present work extends research on NHQTs from quantum physics to the field of classical waves for designing metamaterials with simple structures and may pave a new way to design UDAMs that would be of potential applications in acoustic isolation, communication, and stealth., Comment: SCIENCE CHINA Physics, Mechanics & Astronomy, 9 pages, 6 figures

Published
2021
Full Text
View/download PDF

10. Customizable beam splitting in planar adiabatic acoustic couplers composed of cylindrical scatterers.

Author

Lü, Cheng, Tang, Shuai, Yao, Jiabao, Song, Jie, and Jiang, Yongyuan

Subjects
*ACOUSTIC couplers, *SOUND waves, *BEAM splitters, *DESIGN
Abstract

In this work, five-waveguide (five-WG) acoustic couplers with planar configurations are designed based on quantumlike adiabatic transfer, through which the incident waves can efficiently transfer from the middle WG to the other two WGs with a customized intensity ratio. The five WGs are connected by space-varying cylindrical scatterers, and the coupling between two adjacent WGs is determined by two Gaussian pulses with a certain delay. Since the evolution process of acoustic waves can adiabatically follow the dark state, the coupler could have a broadband and stable performance. Moreover, it is easy to change the ratio of the beam splitting by utilizing different peak values of the coupling between the middle three WGs. The agreements between analytical, numerical, and experimental results confirm the feasibility of the design, providing an effective solution for high-performance acoustic beam splitters with customizable output intensities. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

12. Efficient acoustic energy transfer based on coupled systems with parallel cavities.

Author

Wang, Rui, Lü, Cheng, Han, Jianning, and Zhang, Qiang

Subjects
*ENERGY transfer, *DESIGN techniques, *CUSTOMIZATION
Abstract

In this work, a coupled acoustic system with parallel cavities is designed by adopting the technique of adiabatic passage. The required space-varying coupling strengths between adjacent cavities can be modulated by meticulously customizing the slit heights along the propagation direction, and efficient energy transfer is realized from one cavity to another. Meanwhile, one-way energy transfer behavior is achieved as well by utilizing a lossy cavity to serve as an intermediate connector of the coupler. Moreover, an available method to optimize the coupling actions is adopted to further reduce the device width so as to achieve desirable energy transfer in a compact configuration. Our work provides an efficient approach for acoustic energy transfer between desired cavities, which may have potential applications in acoustic communication, detection, and filtering. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results