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Gu Y, Kumar V, Dayavansha EK, Schoen S, Feleppa E, Tadross R, Wang MH, Washburn MJ, Thomenius K, Samir AE. Acoustic diffraction-resistant adaptive profile technology (ADAPT) for elasticity imaging. SCIENCE ADVANCES 2023; 9:eadi6129. [PMID: 37910613 PMCID: PMC10619922 DOI: 10.1126/sciadv.adi6129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 09/28/2023] [Indexed: 11/03/2023]
Abstract
Acoustic beam shaping with high degrees of freedom is critical for applications such as ultrasound imaging, acoustic manipulation, and stimulation. However, the ability to fully control the acoustic pressure profile over its propagation path has not yet been achieved. Here, we demonstrate an acoustic diffraction-resistant adaptive profile technology (ADAPT) that can generate a propagation-invariant beam with an arbitrarily desired profile. By leveraging wave number modulation and beam multiplexing, we develop a general framework for creating a highly flexible acoustic beam with a linear array ultrasonic transducer. The designed acoustic beam can also maintain the beam profile in lossy material by compensating for attenuation. We show that shear wave elasticity imaging is an important modality that can benefit from ADAPT for evaluating tissue mechanical properties. Together, ADAPT overcomes the existing limitation of acoustic beam shaping and can be applied to various fields, such as medicine, biology, and material science.
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Affiliation(s)
- Yuyang Gu
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
| | - Viksit Kumar
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
| | - E. G. Sunethra K. Dayavansha
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
| | - Scott Schoen
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
| | - Ernest Feleppa
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
| | - Rimon Tadross
- General Electric Healthcare, Wauwatosa, WI 53226, USA
| | | | | | - Kai Thomenius
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
| | - Anthony E. Samir
- Department of Radiology, Massachusetts General Hospital, Center for Ultrasound Research and Translation, Boston, MA 02114, USA
- Harvard Medical School, Cambridge, MA 02115, USA
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Supercontinuum Induced by Filamentation of Bessel-Gaussian and Laguerre-Gaussian Beams in Water. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12126005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In this paper, we study the characteristics of the supercontinuum (SC) induced by the filamentation of two typical vortex beams (i.e., Laguerre-Gaussian (LG) and Bessel-Gaussian (BG) beams) in water. By moving the cuvette filled with water along the laser propagation path, we measure the SC induced by the filamentation of the two vortex beams at different positions in water. The results show that the degree of spectral broadening induced by the filamentation of LG beams hardly changes with the change of position, while for BG beams, the spectral broadening induced by filamentation is weak on both sides and strong in the middle. The value of topological charge (TC) affects the length of the filament formed by BG beams; however, its effect on the spectral broadening induced by the filamentation of LG and BG beams is negligible.
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Yan B, Ling X, Li R, Zhang J, Liu C. Optical Force and Torque on a Graphene-Coated Gold Nanosphere by a Vector Bessel Beam. MICROMACHINES 2022; 13:mi13030456. [PMID: 35334751 PMCID: PMC8951309 DOI: 10.3390/mi13030456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/02/2022] [Accepted: 03/08/2022] [Indexed: 12/05/2022]
Abstract
In the framework of the generalized Lorenz–Mie theory (GLMT), the optical force and torque on a graphene-coated gold nanosphere by a vector Bessel beam are investigated. The core of the particle is gold, whose dielectric function is given by the Drude–Sommerfeld model, and the coating is multilayer graphene with layer number N, whose dielectric function is described by the Lorentz–Drude model. The axial optical force Fz and torque Tz are numerically analyzed, and the effects of the layer number N, wavelength λ, and beam parameters (half-cone angle α0, polarization, and order l) are mainly discussed. Numerical results show that the optical force and torque peaks can be adjusted by increasing the thickness of the graphene coating, and can not be adjusted by changing α0 and l. However, α0 and l can change the magnitude of the optical force and torque. The numerical results have potential applications involving the trapped graphene-coated gold nanosphere.
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Affiliation(s)
- Bing Yan
- Shool of Information and Communication Engineering, North University of China, Taiyuan 030051, China;
- Correspondence:
| | - Xiulan Ling
- Shool of Information and Communication Engineering, North University of China, Taiyuan 030051, China;
| | - Renxian Li
- School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China;
| | - Jianyong Zhang
- School of Computing, Engineering and Digital Technologies, Teesside University, Middlesbrough TS1 3BA, UK;
| | - Chenhua Liu
- Application Science Institute, Taiyuan University of Science and Technology, Taiyuan 030024, China;
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