Isolated detection of elastic waves driven by the momentum of light
| Autor: | Jernej Laloš, Kenneth J. Chau, Aleš Babnik, Rok Petkovšek, Nelson G. C. Astrath, Gustavo V. B. Lukasievicz, Max Bethune-Waddell, Tomaž Požar |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Electromagnetic field
Science General Physics and Astronomy Energy–momentum relation electrodynamics 02 engineering and technology radiation pressure 01 natural sciences String (physics) General Biochemistry Genetics and Molecular Biology Article Momentum elastični valovi Optical physics Dielectric mirror 0103 physical sciences 010306 general physics lcsh:Science Author Correction svetlobni tlak Physics Multidisciplinary Photoacoustics elastic waves Observable General Chemistry 021001 nanoscience & nanotechnology elektrodinamika elastodynamics Computational physics gibalna količina Radiation pressure linear momentum lcsh:Q 0210 nano-technology udc:519.6:535(045) elastodinamika |
| Zdroj: | Nature Communications, Vol 9, Iss 1, Pp 1-11 (2018) Nature Communications Nature communications, vol. 9, no. 3340, 2018. |
| ISSN: | 2041-1723 |
| Popis: | Electromagnetic momentum carried by light is observable through the mechanical effects radiation pressure exerts on illuminated objects. Momentum conversion from electromagnetic fields to elastic waves within a solid object proceeds through a string of electrodynamic and elastodynamic phenomena, collectively bound by momentum and energy continuity. The details of this conversion predicted by theory have yet to be validated by experiments, as it is difficult to distinguish displacements driven by momentum from those driven by heating due to light absorption. Here, we have measured temporal variations of the surface displacements induced by laser pulses reflected from a solid dielectric mirror. Ab initio modelling of momentum flow describes the transfer of momentum from the electromagnetic field to the dielectric mirror, with subsequent creation/propagation of multicomponent elastic waves. Complete consistency between predictions and absolute measurements of surface displacements offers compelling evidence of elastic transients driven predominantly by the momentum of light. The exact mechanism of momentum conversion from light to an object has varied descriptions in the literature and experimental verifications are difficult. Here the authors do an in-depth experimental and numerical study of the momentum dynamics of elastic waves in a dielectric mirror hit by a pulsed laser beam. |
| Databáze: | OpenAIRE |
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