Subwavelength Acoustic Vortex Beams Using Self-Demodulation
| Autor: | Ruben D. Muelas-Hurtado, Vicent Romero-García, Noé Jiménez, Joao L. Ealo, Aroune Duclos |
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| Přispěvatelé: | Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Angular momentum Physics::Optics General Physics and Astronomy 02 engineering and technology 01 natural sciences symbols.namesake Optics 0103 physical sciences Rayleigh scattering 010306 general physics ComputingMilieux_MISCELLANEOUS Mixing (physics) Topological quantum number Physics business.industry Acoustic vortices [PHYS.MECA]Physics [physics]/Mechanics [physics] 021001 nanoscience & nanotechnology [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] Vortex Nonlinear system Wavelength Nonlinear acoustics FISICA APLICADA symbols Selddemodulation 0210 nano-technology business |
| Zdroj: | Physical Review Applied Physical Review Applied, American Physical Society, 2021, 15 (5), ⟨10.1103/PhysRevApplied.15.054027⟩ RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| ISSN: | 2331-7019 |
| Popis: | [EN] Acoustic vortices with subwavelength dimensions and tunable topological charge are theoretically and experimentally synthesized at distances far beyond the Rayleigh diffraction length of the source, using self-demodulation. A dual helical acoustic source is used to generate two primary confocal vortex beams at different frequencies and different topological charges. As a consequence of the conservation of angular momentum during nonlinear wave mixing, a self-demodulated vortex beam at the difference frequency emerges, keeping the spatial features of the primary vortex beams and a topological charge that is the difference of their topological charges. We report subdiffractive vortices the characteristic size of which is 18 times smaller than its wavelength at a distance 2.8 times the Rayleigh diffraction length. The generation and focusing of subwavelength vortices paves the way for long-range communication, biomedical, and wave-matter interaction applications. |
| Databáze: | OpenAIRE |
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