Optical grinder: sorting of trapped particles by orbital angular momentum

Bobkova, Valeriia; Stegemann, Jan; Droop, Ramon; Otte, Eileen; Denz, Cornélia

doi:10.1364/oe.419876

Cited by 38 publications

(21 citation statements)

References 36 publications

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“…There are highly interesting optical communication opportunities [157,158], with much of the current focus being the challenge of propagation through scattering or turbulent media [159][160][161]. Meanwhile, directly exploiting the orbital angular momentum of vortex beams finds microscale optomechanical applications in microparticle sorting [162], non-contact motorized lab-on-a-chip fluidics [163,164], and confined space rheology [165], while the application of vortex beams in the field of nanolithography has been shown to afford new top-down methods for directly fabricating chiral nanostructures [32,166]. The chirality intrinsically associated with such beams is of further interest for the additional dimension it can offer as a spectroscopic tool, where it is used as a probe of media ranging from chiral compounds [25,119], to plasmonic, nano-and metamaterials [34,167,168], and magnetic media [169], and in studies on free atoms [170,171].…”

Section: Discussionmentioning

confidence: 99%

Symmetry and Quantum Features in Optical Vortices

Andrews

2021

Symmetry

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Optical vortices are beams of laser light with screw symmetry in their wavefront. With a corresponding azimuthal dependence in optical phase, they convey orbital angular momentum, and their methods of production and applications have become one of the most rapidly accelerating areas in optical physics and technology. It has been established that the quantum nature of electromagnetic radiation extends to properties conveyed by each individual photon in such beams. It is therefore of interest to identify and characterize the symmetry aspects of the quantized fields of vortex radiation that relate to the beam and become manifest in its interactions with matter. Chirality is a prominent example of one such aspect; many other facets also invite attention. Fundamental CPT symmetry is satisfied throughout the field of optics, and it plays significantly into manifestations of chirality where spatial parity is broken; duality symmetry between electric and magnetic fields is also involved in the detailed representation. From more specific considerations of spatial inversion, amongst which it emerges that the topological charge has the character of a pseudoscalar, other elements of spatial symmetry, beyond simple parity inversion, prove to repay additional scrutiny. A photon-based perspective on these features enables regard to be given to the salient quantum operators, paying heed to quantum uncertainty limits of observables. The analysis supports a persistence in features of significance for the material interactions of vortex beams, which may indicate further scope for suitably tailored experimental design.

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Section: Discussionmentioning

confidence: 99%

Symmetry and Quantum Features in Optical Vortices

Andrews

2021

Symmetry

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“…Recently, light beams with orbital angular momenta (OAM) have been used in particle trapping and manipulation, as well as high-speed communication [13,[27][28][29]. The azimuthal mode converters reported here demonstrate the possibility of generating OAM beams using relatively simple structures instead of bulky antenna arrays [30].…”

Section: A Case 1: Azimuthal Mode Convertermentioning

confidence: 99%

“…(55) Finally, the wave matrix of a metasurface described by an admittance profile (39) can be derived by converting from the ABCD matrix using (28),…”

Section: Metasurfacesmentioning

confidence: 99%

Analysis and Synthesis of Cascaded Cylindrical Metasurfaces Using a Wave Matrix Approach

Lin

Grbic

2021

IEEE Trans. Antennas Propagat.

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In recent years, there has been extensive research on planar metasurfaces capable of arbitrarily controlling scattered fields. However, rigorous studies on conformal metasurfaces, such as those that are cylindrical, have been few in number likely due to their more complex geometry. Here, wave propagation in cascaded cylindrical structures consisting of layers of dielectric spacers and azimuthally-varying metasurfaces (subwavelength patterned metallic claddings) is investigated. A wave matrix approach, which incorporates the advantages of both ABCD matrices and scattering matrices (S matrices), is adopted. Wave matrices are used to model the higher order coupling between metasurface layers, overcoming fabrication difficulties associated with previous works. The proposed framework provides an efficient approach to synthesize the inhomogeneous sheet admittances that realize a desired cylindrical field transformation. Design examples are reported to illustrate the power and potential applications of the proposed method in antenna design and stealth technology.

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“…With the aid of a programmable spatial light modulator (SLM), holographic optical tweezers of OAM light were produced to capture and transport many particles simultaneously 16 – 18 . The light topography, so-called optical grinder, was recently generated by OAM carrying Laguerre-Gaussian beams and a SLM for optical trapping and size-selective particle sorting 19 .…”

Section: Introductionmentioning

confidence: 99%

Production of orbital angular momentum states of optical vortex beams using a vortex half-wave retarder with double-pass configuration

Deachapunya

Srisuphaphon

Buathong

2022

Sci Rep

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Higher orders of orbital angular momentum states (OAMs) of light have been produced with a double-pass configuration through a zero-order vortex half-wave retarder (VHWR). This double-pass technique can reduce the number of VHWR plates used, thus reducing costs. The OAM states of the vortex beams are identified by the near-field Talbot effect. Polarization dependence of the vortex states can also be demonstrated with this VHWR using Talbot effect. Without using the Talbot patterns, this effect of the polarization on the vortex beam can not be recognized. A theoretical validation has also been provided to complement the experimental results. Our study gives an improved understanding of this approach to use a VHWR plate.

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Optical grinder: sorting of trapped particles by orbital angular momentum

Cited by 38 publications

References 36 publications

Symmetry and Quantum Features in Optical Vortices

Symmetry and Quantum Features in Optical Vortices

Analysis and Synthesis of Cascaded Cylindrical Metasurfaces Using a Wave Matrix Approach

Production of orbital angular momentum states of optical vortex beams using a vortex half-wave retarder with double-pass configuration

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