
Proceedings Paper
Self-consistent optomechanical trapping, strain, and deformation of elastic dielectricaFormat | Member Price | Non-Member Price |
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Paper Abstract
Light forces induced by scattering and absorption in elastic dielectrics lead to strain inducing local density
modulations and deformations. These perturbations in turn modify the light propagation and generate an
intricate nonlinear response. We generalise an analytic approach where light propagation in one-dimensional
media of inhomogeneous density is modelled as a result of multiple scattering between polarizable slices. Using
the Maxwell stress tensor formalism we compute the local optical forces and iteratively approach self-consistent
density distributions where the elastic back-action balances gradient- and scattering forces. For an optically
trapped finite dielectric we derive the nonlinear dependence of trap position, stiffness and total deformation
on the object’s size and field configuration. Generally trapping is enhanced by deformation, which exhibits a
periodic change between stretching and compression even allowing areas of bistability. This strongly deviates from
qualitative expectations based on the change of photon momentum of light crossing the surface of a dielectric.
Paper Details
Date Published: 10 October 2012
PDF: 9 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84581Z (10 October 2012); doi: 10.1117/12.2000309
Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
PDF: 9 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84581Z (10 October 2012); doi: 10.1117/12.2000309
Show Author Affiliations
M. Sonnleitner, Univ. Innsbruck (Austria)
Innsbruck Medical Univ. (Austria)
M. Ritsch-Marte, Innsbruck Medical Univ. (Austria)
Innsbruck Medical Univ. (Austria)
M. Ritsch-Marte, Innsbruck Medical Univ. (Austria)
H. Ritsch, Univ. Innsbruck (Austria)
Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
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