More twists on optical twisters: of helico-conical beams, superpositions and combinations

Jesper Glückstad (Invited author), Darwin Palima (Invited author)

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Abstract

We have previously demonstrated so-called optical twisters that can steer microparticles along spiral trajectories during optical micromanipulation. These optical twisters may be created using Fourier holograms ofthe helicoconical form, exp[ i l 8 (K- r/r0)], which is characterized by non nonseparable helical or azimuthal phase and the conical o r radial phase, and that have been shown to self-reconstruct after an obstruction . In this work, we deeanstruet the helico-conical beam (HCB) as a coherent superposition of Bessel-like beams, which carry arbitrary topological charge. Fromthis perspective, the HCB is seen as belonging to a gene ri c family of beams that can be generated using this type of superposition. Controiling this superposition enables us to generate tailared spiraling
beams. We show ditterent examples of such tailared beams, such as multi-helico-conical beams (i. e., helico-conical beam with seleetable number of multiple helix) as well as multihelical beams that emulate the diffractionfree properties of its constituent Bessel-like beams.
Original languageEnglish
Publication date2013
Publication statusPublished - 2013
Event2. International Conference on Optical Angular Momentum (icoam2013) - Glasgow, United Kingdom
Duration: 3 Jun 20135 Jun 2013

Conference

Conference2. International Conference on Optical Angular Momentum (icoam2013)
CountryUnited Kingdom
CityGlasgow
Period03/06/201305/06/2013

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