Tailored spectral rotation of vortex pulses by non-uniform spiral phase gratings

Liebmann, Max; Treffer, Alexander; Böck, Martin; Jurke, Mathias; Wallrabe, Ulrike; Grünwald, R.

doi:10.1117/12.2578503

Cited by 2 publications

(8 citation statements)

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“…Recently we reported on first proof-of-principle experiments with high-resolution phase-only LCoS-SLMs as programmable non-uniform SPGs [57]. Here we present the results of continuing studies and a more detailed discussion.…”

Section: Silicon (Lcos)-slm Techniquementioning

confidence: 86%

“…This can lead to an overlap and interference of partial beams. Case 4*) is obtained by a grating transformation by linear stretching in one direction (mapping a circle to an ellipse) which is equivalent to illumination at oblique incidence [57]. In this case, p oscillates with increasing rotation angle  and passes two maxima and two minima within every full rotational period of = 2.…”

Section: Spiral Phase Gratingsmentioning

confidence: 99%

“…( 4) describes the speed of angular rotation as a function of the pulse travel time. The temporal derivative of the angular velocity is a measure of rotational acceleration or deceleration and can be interpreted as a kind of "selftorque" [57]:…”

Section: Propagation Dependent Self-torquementioning

confidence: 99%

“…Figure10. Angular rotation of "spectral eyes" generated with negatively chirped SPG-1 varying with increasing propagation distance for a selected sequence of intensity maps (AOI = 64 x 64 µm 2 , red and blue circles: red-and blue-shifted parts of the spectral anomaly, the line indicates the actual angle of rotation[57]). …”

mentioning

confidence: 99%

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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: Silicon (Lcos)-slm Techniquementioning

confidence: 86%

Section: Spiral Phase Gratingsmentioning

confidence: 99%

Section: Propagation Dependent Self-torquementioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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

“…Recently, we reported on the first proof-of-principle experiments with high-resolution phase-only LCoS-SLMs as programmable non-uniform SPGs [56]. Here, we present the results of continuing studies and a more detailed discussion.…”

Section: Introductionmentioning

confidence: 92%

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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Tailored spectral rotation of vortex pulses by non-uniform spiral phase gratings

Cited by 2 publications

References 0 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

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