MEMS Bessel Beam Acoustic Transducer (MEMS-BBAT) with Air-Cavity Lens Based on Spiral Diffraction Grating for Particle Trapping

Jia, Yuyu; Sun, Zhenhuan; Li, Jiaqi; Zhao, Lurui; Liu, Hai; Li, Teng; Liu, Song

doi:10.1109/ius54386.2022.9958127

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Spiral phase gratings (SPGs) act as diffractive axicons with an axially extended focal zone and a helical wavefront [36][37][38]. SPG were developed for THz applications [39] and for the generation of acoustic vortices with electro-mechanical transducers [40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Grunwald,

Jurke,

Liebmann

et al. 2024

Preprint

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The application of non-uniform spiral gratings to control structure, topological parameters and propagation of orbital angular momentum (OAM) beams was studied experimentally with coherent near-infrared light. Adapted digital spiral grating structures were programmed into the phase map of a high-resolution liquid-crystal-on-silicon spatial light modulator (LCoS-SLM). It is shown that characteristic spatio-spectral anomalies related to Gouy phase shift can be used as pointers to quantify rotational beam properties. Depending on sign and gradient of spatially variable periods of chirped spiral gratings (CSG), variations of rotation angle and angular velocity as a function of propagation distance were measured. Propagation-dependent self-torque is introduced in analogy to known local self-torque phenomena of OAM beams as obtained by the superposition of temporally chirped or phase modulated wavepackets.

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Section: Introductionmentioning

confidence: 99%

Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Grunwald,

Jurke,

Liebmann

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Spiral phase gratings (SPGs) act as diffractive axicons with an axially extended focal zone and a helical wavefront [36][37][38]. SPGs were developed for THz applications [39] and for the generation of acoustic vortices with electro-mechanical transducers [40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Grunwald,

Jurke,

Liebmann

et al. 2024

Photonics

View full text Add to dashboard Cite

The application of non-uniform spiral gratings to control the structure, topological parameters and propagation of orbital angular momentum (OAM) beams was studied experimentally with coherent near-infrared light. Adapted digital spiral grating structures were programmed into the phase map of a high-resolution liquid-crystal-on-silicon spatial light modulator (LCoS-SLM). It is shown that characteristic spatio-spectral anomalies related to Gouy phase shift can be used as pointers to quantify rotational beam properties. Depending on the sign and gradient of spatially variable periods of chirped spiral gratings (CSGs), variations in rotation angle and angular velocity were measured as a function of the propagation distance. Propagation-dependent self-torque is introduced in analogy to known local self-torque phenomena of OAM beams as obtained by the superposition of temporally chirped or phase-modulated wavepackets. Applications in metrology, nonlinear optics or particle trapping are conceivable.

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Rotation-free high order Bessel beam acoustic transducer for particle trapping

Sun,

Li,

Liu

et al. 2023

2023 IEEE International Ultrasonics Symposium (IUS)

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MEMS Bessel Beam Acoustic Transducer (MEMS-BBAT) with Air-Cavity Lens Based on Spiral Diffraction Grating for Particle Trapping

Cited by 4 publications

References 7 publications

Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Rotation-free high order Bessel beam acoustic transducer for particle trapping

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