By Mike Wördemann
The optical trapping of colloidal topic is an unmatched box of know-how for permitting distinctive dealing with of debris on microscopic scales, exclusively by way of the strength of sunshine. even though the fundamental idea of optical tweezers, that are in accordance with a unmarried laser beam, has matured and located an unlimited variety of fascinating functions, specifically within the lifestyles sciences, there are robust calls for for extra refined techniques. This thesis supplies an introductory evaluate of latest optical micromanipulation suggestions and experiences the cutting-edge of the rising box of dependent mild fields and their functions in optical trapping, micromanipulation, and supplier. the writer provides tested, and introduces novel thoughts for the holographic and non-holographic shaping of a mild box. a unique emphasis of the paintings is the demonstration of complicated purposes of the hence created established mild fields in optical micromanipulation, employing quite a few geometries and unconventional gentle propagation homes. whereas many of the strategies constructed are verified with man made microscopic reference debris, the paintings concludes with a accomplished demonstration of optical keep watch over and alignment of bacterial cells, and hierarchical supramolecular employer utilizing devoted nanocontainer particles.
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Extra resources for Structured Light Fields: Applications in Optical Trapping, Manipulation, and Organisation
2012). The hologram can be designed in such a way that in the trapping plane almost any arbitrary intensity distribution can be achieved. Multiple optical traps in this scenario are only a special case of possible complex trapping geometries. Strong optical tweezers require a high level of laser power in the trapping plane. Consequently, a high diffraction M. 1007/978-3-642-29323-8_3, © Springer-Verlag Berlin Heidelberg 2012 27 28 3 Holographic Phase Contrast efficiency is mandatory and thus usually phase-only DOEs are used.
2009; Shvedov et al. 2010) and bottle-shaped hollow light fields (Shvedov et al. 2010; Zhang and Chen 2011) and employing photophoretic forces (Kerker and Cooke 1982) rather than optical forces. Again, as with the examples of applications of single optical tweezers, the list of exciting innovations is endless and the mentioned works are only an arbitrary selection. Many more examples, however, will be provided within the following chapters. References Allen L, Beijersbergen M, Spreeuw R, Woerdman J (1992) Orbital angular momentum of light and the transformation of laguerre-gaussian laser modes.
J Phys B: At Mol Opt Phys 41:101001 O’Neil A, Padgett M (2002) Rotational control within optical tweezers by use of a rotating aperture. Opt Lett 27:743–745 O’Neil AT, MacVicar I, Allen L, Padgett MJ (2002) Intrinsic and extrinsic nature of the orbital angular momentum of a light beam. Phys Rev Lett 88:053601 Padgett M, Bowman R (2011) Tweezers with a twist. Nat Photonics 5:343–348 Padgett M, Arlt J, Simpson N, Allen L (1995) An experiment to observe the intensity and phase structure of Laguerre-Gaussian laser modes.