Journal: Nature Communications
Article Title: Dynamically reconfigurable acoustofluidic metasurface for subwavelength particle manipulation and assembly
doi: 10.1038/s41467-024-55337-0
Figure Lengend Snippet: a Simulated displacement response of the center membrane reveals the presence of multiple resonances or array modes. b Simulated displacement, pressure, velocity and Gor’kov potential fields at 1.48 MHz. Black arrows overlaid on the Gor’kov potential field display the direction of the resultant acoustic radiation force on particles with a positive acoustic contrast factor. c The normalized acoustic pressure ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${P}_{{rms}}$$\end{document} P r m s ) in the Z-direction exhibits an exponential decay with increasing distance from the metasurface, characteristic of the evanescent nature of the standing wavefield. The inset equation illustrates the relationship between the root mean square (RMS) pressure and the distance from the surface (z). d Non-zero forces are observed only in the region above DReAM, emphasizing the local nature of the array modes. e Optical image of the microfabricated 10 × 10 DReAM array. A closer look at the surface shows the periodically spaced membrane resonators. Scale bar, 100 µm. f Schematic of the setup used to characterize DReAM. The array is excited electrically and a laser vibrometer is used to measure membrane velocity. Created in BioRender. Bravo, R. (2024) https://BioRender.com/i74r726 . g Fourier transform of the velocity response of a single membrane on DReAM reveals multiple array resonance modes and a stopband above 2.1 MHz. Time domain response ( h ) and frequency-time transform ( i ) of the resulting excitation indicates the early arrival of low frequency components (left of dashed vertical line), subsequently followed by the slower high frequency components (right of dashed vertical line), confirming the dispersive nature of DReAM.
Article Snippet: The membrane displacement was measured using a Polytec OFV-5000/534 Laser Doppler Vibrometer (Supplementary Fig. ) and the output signal was acquired using a Picoscope 5000 series oscilloscope.
Techniques: Membrane
![a Simulated <t>displacement</t> response of the center membrane reveals the presence of multiple resonances or array modes. b Simulated displacement, pressure, velocity and Gor’kov potential fields at 1.48 MHz. Black arrows overlaid on the Gor’kov potential field display the direction of the resultant acoustic radiation force on particles with a positive acoustic contrast factor. c The normalized acoustic pressure ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${P}_{{rms}}$$\end{document} P r m s ) in the Z-direction exhibits an exponential decay with increasing distance from the metasurface, characteristic of the evanescent nature of the standing wavefield. The inset equation illustrates the relationship between the root mean square (RMS) pressure and the distance from the surface (z). d Non-zero forces are observed only in the region above DReAM, emphasizing the local nature of the array modes. e Optical image of the microfabricated 10 × 10 DReAM array. A closer look at the surface shows the periodically spaced membrane resonators. Scale bar, 100 µm. f Schematic of the setup used to characterize DReAM. The array is excited electrically and a laser vibrometer is used to measure membrane velocity. Created in BioRender. Bravo, R. (2024) https://BioRender.com/i74r726 . g Fourier transform of the velocity response of a single membrane on DReAM reveals multiple array resonance modes and a stopband above 2.1 MHz. Time domain response ( h ) and frequency-time transform ( i ) of the resulting excitation indicates the early arrival of low frequency components (left of dashed vertical line), subsequently followed by the slower high frequency components (right of dashed vertical line), confirming the dispersive nature of DReAM.](https://pub-med-central-images-cdn.bioz.com/pub_med_central_ids_ending_with_6025/pmc11736025/pmc11736025__41467_2024_55337_Fig2_HTML.jpg)