Miniaturized photogenerated electro-optic axicon lens Gaussian-to-Bessel beam conversion

Domenico, Giuseppe Di; Parravicini, Jacopo; Antonacci, Giuseppe; Silvestri, S.; Agranat, Aharon J.; DelRe, Eugenio

doi:10.1364/ao.56.002908

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…Light droplets are recently demonstrated nondiffracting beams of light of finite depth of focus that are obtained interfering multiple co-axial Bessel beams 30 . Miniaturized and superimposed Bessel beams have been further proposed using volume holography 31 , 32 , have seen use as highly effective optical traps 33 , optical twezeers 34 and material processing 35 , 36 . Similarly to these approaches, our method exploits interference of a set of plane waves whose k-vectors lie on two different co-axial cones.…”

Section: Introductionmentioning

confidence: 99%

Cancellation of Bessel beam side lobes for high-contrast light sheet microscopy

Domenico

Ruocco

Colosi

et al. 2018

Sci Rep

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An ideal illumination for light sheet fluorescence microscopy entails both a localized and a propagation invariant optical field. Bessel beams and Airy beams satisfy these conditions, but their non-diffracting feature comes at the cost of the presence of high-energy side lobes that notably degrade the imaging contrast and induce photobleaching. Here, we demonstrate the use of a light droplet illumination whose side lobes are suppressed by interfering Bessel beams of specific k-vectors. Our droplet illumination readily achieves more than 50% extinction of the light distributed across the Bessel side lobes, providing a more efficient energy localization without loss in transverse resolution. In a standard light sheet fluorescence microscope, we demonstrate a two-fold contrast enhancement imaging micron-scale fluorescent beads. Results pave the way to new opportunities for rapid and deep in vivo observations of large-scale biological systems.

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Section: Introductionmentioning

confidence: 99%

Cancellation of Bessel beam side lobes for high-contrast light sheet microscopy

Domenico

Ruocco

Colosi

et al. 2018

Sci Rep

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“…This extraordinary performance is attributed to their compositional disordering, which can introduce a short‐range polar characteristic, indicating the existence of polar nanoregions (PNRs) 1,7,9,13 . Based on these properties, various functional devices, such as high‐speed electro‐optical scanners and electro‐optic modulators, have been designed and fabricated 6,13–15 . Generally, PNRs exist in the relaxor ferroelectrics with dispersion in the dielectric response, thermal hysteresis, and anomalous relaxation times.…”

Section: Introductionmentioning

confidence: 99%

“…properties, various functional devices, such as high-speed electro-optical scanners and electro-optic modulators, have been designed and fabricated. 6,[13][14][15] Generally, PNRs exist in the relaxor ferroelectrics with dispersion in the dielectric response, thermal hysteresis, and anomalous relaxation times. In those cases, the KTN-based crystals are supposed to behave like non-relaxor ferroelectrics because of the nondispersive permittivity around the Curie temperature (T C ) for a long term.…”

Section: Introductionmentioning

confidence: 99%

Dynamic of polar nanoregions and its impact on the pyroelectric and dielectric properties in paraelectric KTN materials

et al. 2023

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The origin of the excellent properties of KTN‐based materials around Curie temperature (TC), which should be originated form the motion of polar nanoregions (PNRs), has attracted considerable research interest. In this paper, the relaxation of a KTa0.63Nb0.37O3 single crystal is discussed with the temperature dependence of permittivity. Moreover, its pyroelectric effect above TC is investigated. In detail, the pyroelectric coefficient decreases from ∼110.0 to ∼13.0 μC/(m2 K), with the temperature increasing from 22 to 33°C, and finally reduces to 0 at 100°C with PNRs disappear. Moreover, the dynamic dielectric nonlinearity for the KTN single crystal is studied in the paraelectric phase. To investigate these mechanisms, the amplitude and phase angle of the first and third harmonics under various electric fields, frequencies, and temperatures are analyzed. As a result, the motions of PNRs induced by electric field, which is pinned and depinned by the defect, are presented to explain the nonlinear dielectric response observed in the paraelectric KTN single crystal.

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Demonstration of self-healing and scattering resilience of acoustic Bessel beams

Antonacci

Caprini

Ruocco

2019

Applied Physics Letters

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In optics, Bessel beams have seen extensive use because they exhibit a non-diffracting propagation and a self-reconstruction capability beyond obstacles encountered along their path, with an ensuing pronounced resilience to scattering. Whether such peculiarities, characteristic of the Helmholtz equation for transverse E and B fields, are manifested by longitudinal acoustic fields is currently unknown. Here, we report the experimental demonstration of the self-healing and the scattering resilience properties of a non-diffracting zero-order acoustic Bessel beam. The beam is obtained interfering ultrasound waves with a propagating vector lying on a cone and is found to be capable of self-reconstructing beyond large spherical obstacles and multiple scattering layers.

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Miniaturized photogenerated electro-optic axicon lens Gaussian-to-Bessel beam conversion

Cited by 8 publications

References 31 publications

Cancellation of Bessel beam side lobes for high-contrast light sheet microscopy

Cancellation of Bessel beam side lobes for high-contrast light sheet microscopy

Dynamic of polar nanoregions and its impact on the pyroelectric and dielectric properties in paraelectric KTN materials

Demonstration of self-healing and scattering resilience of acoustic Bessel beams

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