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      Enhanced deep-tissue photoacoustics by using microcomposites made of RF-metamaterials and soft polymers: double- and triple-resonance phenomena

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          Abstract

          Photoacoustics + ultrasound-transducer systems offer an imaging platform with high resolution to explore body tissues, food, and valuable artwork. Plasmonics constitutes one source of resonant heating and thermal expansion necessary to generate acoustic waves. However, its associated techniques are seriously limited to the laser penetration and the non-specific hyperthermia in the sample. Besides, there is a compromise between the nanoparticle size and the pressure generated since the photoacoustic efficiency depends on the scatterer's surface-to-volume ratio. This work adopts a paradigm shift in photoacoustics. By simulating microparticles made of some random composites, the pressure calculated can be similar or superior to the one obtained with plasmonic optoacoustics. The improvement is due to a phenomenon called double or triple resonance: the excitation of one or both electric and magnetic "radio-plasmons" and the simultaneous excitation of the particle's acoustic mode. As electromagnetic pulses restrict to nanosecond widths and MHz frequencies, the proposed method avoids the low penetration in tissues and the thermal damage, constituting a non-invasive technique of theragnosis. Moreover, the "resonant" pressure obtained lasts longer in time than conventional photoacoustic pressures, providing another central feature to enhance detection. To fully comprehend the multi-resonance framework, this work develops a complete photoacoustic solution. The proposed approach paves the way to thermo-acoustic imaging/manipulation methods for sensitive materials/tissues reaching micrometer resolution.

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          Author and article information

          Journal
          19 January 2022
          Article
          2201.07851
          b0232e19-5a80-45f1-a02c-6e7d2afc5a40

          http://creativecommons.org/licenses/by-nc-nd/4.0/

          History
          Custom metadata
          10 pages, 6 figures
          physics.app-ph physics.comp-ph physics.med-ph physics.optics

          Technical & Applied physics,Mathematical & Computational physics,Optical materials & Optics,Medical physics

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