Detection of a Spinning Object Using Light’s Orbital Angular Momentum

Lavery, Martin P. J.; Speirits, Fiona C.; Barnett, Stephen M.; Padgett, Miles J.

doi:10.1126/science.1239936

Cited by 855 publications

(431 citation statements)

References 24 publications

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“…Since then, this technique has been widely used to probe the angle velocity of spinning objects. [11][12][13][14][15] In 2014, the rotational Doppler effect was first combined with optical traps to measure the rotation rate of a microscopic calcite. 16,17 This has immensely expanded the application of the rotational Doppler effect in microscopic domain.…”

Section: Introductionmentioning

confidence: 99%

Rotation of an optically trapped vaterite microsphere measured using rotational Doppler effect

et al. 2018

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Abstract. The angular velocity of a vaterite microsphere spinning in the optical trap is measured using rotational Doppler effect. The perfectly spherical vaterite microspheres are synthesized via coprecipitation in the presence of silk fibroin nanospheres. When trapped by a circularly polarized beam, the vaterite microsphere is uniformly rotated in the trap center. The probe beams containing two Laguerre-Gaussian beams of opposite topological charge l ¼ AE7, l ¼ AE8, and l ¼ AE9 are illuminated on the spinning vaterite. By analyzing the backscattered light, a frequency shift is observed scaling with the rotation rate of the vaterite microsphere. The multiplicative enhancement of the frequency shift proportion to the topological charge has greatly improved the measurement precision. The reliability and practicability of this approach are verified through varying the topological charge of the probe beam and the trapping laser power. In consideration of the excellent measurement precision of the rotation frequency, this technique might be generally applicable in studying the torsional properties of micro-objects. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Introductionmentioning

confidence: 99%

Rotation of an optically trapped vaterite microsphere measured using rotational Doppler effect

et al. 2018

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“…In the past decades, vortex beams have been explored extensively and applied in various fields, such as optical manipulation [1] , optical imaging [2] , free-space data transmission [3] , quantum information transfer [4] , and the detection of a spinning object [5] . The phase term expðilφÞ (l and φ are the topological charge and azimuthal angle, respectively) in a vortex beam imposes orbital angular momentum (OAM) on the beam, and each photon of such a beam has an OAM of lℏ [6] .…”

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confidence: 99%

Experimental determination of the azimuthal and radial mode orders of a partially coherent LGpl beam (Invited Paper)

Liu

et al. 2017

Chin. Opt. Lett.

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It is known that one can determine the mode orders (i.e., the azimuthal order and radial order) of a partially coherent LG pl beam (i.e., a partially coherent vortex beam) based on the measurement of the cross-correlation function (CCF) and the double correlation function (DCF) together. The technique for measuring the CCF is known. In this Letter, we propose a method for measuring the DCF. Based on the proposed method, the determination of the mode orders of a partially coherent LG pl beam is demonstrated experimentally.

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“…Following the methods of Gibson et al 13 , the mode purities of the generated OAM modes were measured to range from 86 to 99% at various resonances of the devices, with the undesired OAM mode contribution arising from the backward travelling wave inside the device due to backscattering in the silicon waveguide 24,25 . In summary, the fully on-chip and single contact control of the OAM device opens up a wide range of possibilities for applications in sensing and manipulation [28][29][30] , telecommunications [3][4][5][6] and quantum optics [8][9][10][31][32][33][34] .…”

Section: Discussionmentioning

confidence: 99%

Fast electrical switching of orbital angular momentum modes using ultra-compact integrated vortex emitters

et al. 2014

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The ability to rapidly switch between orbital angular momentum modes of light has important implications for future classical and quantum systems. In general, orbital angular momentum beams are generated using free-space bulk optical components where the fastest reconfiguration of such systems is around a millisecond using spatial light modulators. In this work, an extremely compact optical vortex emitter is demonstrated with the ability to actively tune between different orbital angular momentum modes. The emitter is tuned using a single electrically contacted thermo-optical control, maintaining device simplicity and micron scale footprint. On-off keying and orbital angular momentum mode switching are achieved at rates of 10 ms and 20 ms respectively.

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Detection of a Spinning Object Using Light’s Orbital Angular Momentum

Cited by 855 publications

References 24 publications

Rotation of an optically trapped vaterite microsphere measured using rotational Doppler effect

Rotation of an optically trapped vaterite microsphere measured using rotational Doppler effect

Experimental determination of the azimuthal and radial mode orders of a partially coherent LGpl beam (Invited Paper)

Fast electrical switching of orbital angular momentum modes using ultra-compact integrated vortex emitters

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