Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces
Optomechanical manipulation of plasmonic nanoparticles is an area of current interest, both fundamental and applied. However, no experimental method is available to determine the forward-directed scattering force that dominates for incident light of a wavelength close to the plasmon resonance. Here,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2016-05-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/1.4945351 |
| _version_ | 1811253439147016192 |
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| author | C. Zensen N. Villadsen F. Winterer S. R. Keiding T. Lohmüller |
| author_facet | C. Zensen N. Villadsen F. Winterer S. R. Keiding T. Lohmüller |
| author_sort | C. Zensen |
| collection | DOAJ |
| description | Optomechanical manipulation of plasmonic nanoparticles is an area of current interest, both fundamental and applied. However, no experimental method is available to determine the forward-directed scattering force that dominates for incident light of a wavelength close to the plasmon resonance. Here, we demonstrate how the scattering force acting on a single gold nanoparticle in solution can be measured. An optically trapped 80 nm particle was repetitively pushed from the side with laser light resonant to the particle plasmon frequency. A lock-in analysis of the particle movement provides a measured value for the scattering force. We obtain a resolution of less than 3 femtonewtons which is an order of magnitude smaller than any measurement of switchable forces performed on nanoparticles in solution with single beam optical tweezers to date. We compared the results of the force measurement with Mie simulations of the optical scattering force on a gold nanoparticle and found good agreement between experiment and theory within a few fN. |
| first_indexed | 2024-04-12T16:50:55Z |
| format | Article |
| id | doaj.art-94d313d4f878479a9c43fc9d24a661ee |
| institution | Directory Open Access Journal |
| issn | 2378-0967 |
| language | English |
| last_indexed | 2024-04-12T16:50:55Z |
| publishDate | 2016-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj.art-94d313d4f878479a9c43fc9d24a661ee2022-12-22T03:24:24ZengAIP Publishing LLCAPL Photonics2378-09672016-05-0112026102026102-810.1063/1.4945351004601APPPushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forcesC. Zensen0N. Villadsen1F. Winterer2S. R. Keiding3T. Lohmüller4Photonics and Optoelectronics Group, Department of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, 80799 Munich, GermanyDepartment of Chemistry, Aarhus University, DK 8000 Aarhus C, DenmarkPhotonics and Optoelectronics Group, Department of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, 80799 Munich, GermanyDepartment of Chemistry, Aarhus University, DK 8000 Aarhus C, DenmarkPhotonics and Optoelectronics Group, Department of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, 80799 Munich, GermanyOptomechanical manipulation of plasmonic nanoparticles is an area of current interest, both fundamental and applied. However, no experimental method is available to determine the forward-directed scattering force that dominates for incident light of a wavelength close to the plasmon resonance. Here, we demonstrate how the scattering force acting on a single gold nanoparticle in solution can be measured. An optically trapped 80 nm particle was repetitively pushed from the side with laser light resonant to the particle plasmon frequency. A lock-in analysis of the particle movement provides a measured value for the scattering force. We obtain a resolution of less than 3 femtonewtons which is an order of magnitude smaller than any measurement of switchable forces performed on nanoparticles in solution with single beam optical tweezers to date. We compared the results of the force measurement with Mie simulations of the optical scattering force on a gold nanoparticle and found good agreement between experiment and theory within a few fN.http://dx.doi.org/10.1063/1.4945351 |
| spellingShingle | C. Zensen N. Villadsen F. Winterer S. R. Keiding T. Lohmüller Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces APL Photonics |
| title | Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces |
| title_full | Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces |
| title_fullStr | Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces |
| title_full_unstemmed | Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces |
| title_short | Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces |
| title_sort | pushing nanoparticles with light a femtonewton resolved measurement of optical scattering forces |
| url | http://dx.doi.org/10.1063/1.4945351 |
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