Comparison of beam generation techniques using a phase only spatial light modulator

Clark, Thomas W.; Offer, Rachel F.; Franke‐Arnold, Sonja; Arnold, Aidan S.; Radwell, Neal

doi:10.1364/oe.24.006249

Cited by 128 publications

(60 citation statements)

References 34 publications

(42 reference statements)

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“…8, which describes one or a combination of two of the listed down-conversion processes, restricted to an idler beam in a pure Hermite-Gauss mode and order conservation. For example, the first row corresponds to process (33); the second row, to process (35); the third row, to a combination of processes (33) and (35); and finally, the fourth row, to a combination of processes (34) and (38). We present in Fig.9 with the transverse modes with the optimal overlap with it.…”

Section: Pumpmentioning

confidence: 99%

Conditions for optical parametric oscillation with a structured light pump

et al. 2018

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We investigate the transverse mode structure of the down-converted beams generated by a type-II optical parametric oscillator (OPO) driven by a structured pump. Our analysis focus on the selection rules imposed by the spatial overlap between the transverse modes of the three fields involved in the non-linear interaction. These rules imply a hierarchy of oscillation thresholds that determine the possible transverse modes generated by the OPO, as remarkably confirmed with experimental results.

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Section: Pumpmentioning

confidence: 99%

Conditions for optical parametric oscillation with a structured light pump

et al. 2018

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“…Eqs. (13)(14)(15) compactly represent enegy/momentum flow in an intuitive basis. We can derive general bounds by adding a single constraint: passivity.…”

Section: Analytical Boundsmentioning

confidence: 99%

“…The largest force or torque that can be exerted on a nanoparticle can thus be formulated as the maximum of Eqs. (14,15) subject to passivity, i.e. Eq.…”

Section: Analytical Boundsmentioning

confidence: 99%

Optimal Nanoparticle Forces, Torques, and Illumination Fields

Liu

Lee

et al. 2018

ACS Photonics

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A universal property of resonant subwavelength scatterers is that their optical cross-sections are proportional to a square wavelength, λ 2 , regardless of whether they are plasmonic nanoparticles, twolevel quantum systems, or RF antennas. The maximum cross-section is an intrinsic property of the incident field : plane waves, with infinite power, can be decomposed into multipolar orders with finite powers proportional to λ 2 . In this Article, we identify λ 2 /c and λ 3 /c as analogous force and torque constants, derived within a more general quadratic scattering-channel framework for upper bounds to optical force and torque for any illumination field. This framework also solves the reverse problem: computing globally optimal "holographic" incident beams, for a fixed collection of scatterers. We analyze structures and incident fields that approach the bounds, which for wavelength-scale bodies show a rich interplay between scattering channels, and we show that spherically symmetric structures are forbidden from reaching the plane-wave force/torque bounds. This framework should enable optimal mechanical control of nanoparticles with light.

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“…Diffraction holograms provide an alternative means of precisely imprinting OAM in all types of matter waves-not just electrons. Similar to gratings used in light optics [47][48][49], electron vortices can be produced by diffraction from nanoscale holographic gratings featuring a fork dislocation [11,12,30] (figure 2). As in optics, the dislocation at the centre of a forked grating encodes a spiral phase.…”

Section: (B) Singular Electron Opticsmentioning

confidence: 99%