Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements

Anand, Vijayakumar; Bhattacharya, Subhashish

doi:10.1117/1.oe.54.11.111310

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…azimuthal angle. The spiral axicon is capable of generating higher order Bessel beams (HOBB) with a large focal depth and carries orbital angular momentum [89][90][91][92]. The images of the modulo-2π phase of the spiral axicon for L=0, 1, 2 and 3 are shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser

Anand¹,

Maksimovic²,

Katkus³

et al. 2020

Preprint

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We put forward a co-axial pump(optical)-probe(X-rays) experimental concept and show performance of the optical component. A Bessel beam generator with a central 100 micrometers-diameter hole (on the optical axis) was fabricated using femtosecond (fs) laser structuring inside a silica plate. This flat-axicon optical element produces a needle-like axial intensity distribution which can be used for the optical pump pulse. The fs-X-ray free electron laser (X-FEL) beam of sub-1 micrometer diameter can be introduced through the central hole along the optical axis onto a target as a probe. Different realisations of optical pump are discussed. Such optical elements facilitate alignment of ultra-short fs-pulses in space and time and can be used in light-matter interaction experiments at extreme energy densities on the surface and in the volume of targets. Full advantage of ultra-short 10 fs X-FEL probe pulses with fs-pump(optical) opens an unexplored temporal dimension of phase transitions and the fastest laser-induced rates of material heating and quenching. A wider field of applications of fs-laser-enabled structuring of materials and design of specific optical elements for astrophotonics is presented.

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Section: Discussionmentioning

confidence: 99%

All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser

Anand¹,

Maksimovic²,

Katkus³

et al. 2020

Preprint

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“…CBSA has many advantages compared to existing DOEs which are used for optical trapping applications. CBSA is a binary DOE and has an uniform period which makes the fabrication procedure much easier for manufacturing compared to other DOEs such as spiral phase plates [20], chiral Fresnel zone plates [28], hybrid DOEs [22,26,27], etc., Secondly, the absence of central peak in the optical field expands the applicability of CBSA to highly absorptive optical trapping specimens.…”

Section: Discussionmentioning

confidence: 99%

“…By combining the optical function of an axicon with a second optical function, the line focus of axicon can be employed as a beam delivery path for the second optical function. One such case is the combining of axicon and a spiral phase plate to generate higher order Bessel beams for optical manipulation [22,36]. Furthermore, combining an axicon with a varying phase was used for generation of accelerating airy beams [37].…”

Section: Methodsmentioning

confidence: 99%

“…Diffractive optical elements such as spiral phase plate [20] and forked grating [21] are used for generation of the vortex beams. In this direction of research, different DOEs with interesting and useful intensity profiles such as flower shaped beams [22], higher order Bessel beams [23], asymmetric vortex beams [24], beams with structured orbital angular momentum [25] and focused vortex beams [26] were designed. While the above intensity patterns have many advantages, in most of the cases, the design and fabrication of DOEs is a challenge and the efficiency is poor due to combining different phase functions [27].…”

Section: Introductionmentioning

confidence: 99%

“…In [24,26], the DOEs are not phase-only but use both amplitude and phase modulation simultaneously which results in a poor efficiency. In [22], the DOE consists of three phase functions which again reduces the effective diffraction efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Binary square axicon with chiral focusing properties for optical trapping

et al. 2019

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We introduce a novel phase-only diffractive optical element called chiral binary square axicon (CBSA). The CBSA is designed by linearly rotating the square half-period zones of the binary square axicon with respect to one another. A quadratic phase mask (QPM) is combined with the CBSA using modulo-2π phase addition technique to bring the far-field intensity pattern of CBSA at the focal plane of the QPM and to introduce quasi-achromatic effects. The periodically rotated zones of CBSA produces a whirlpool phase profile and twisted intensity patterns at the focal plane of QPM. The degree of twisting seen in the intensity patterns is dependent upon the angular step size of rotation of the zones. The intensity pattern was found to rotate around the optical axis along the direction of propagation. The phase patterns of CBSA with different angles of zone rotation are displayed on a phase-only spatial light modulator and the experimental results were found to match with the simulation results. To evaluate the optical trapping capabilities of CBSA, an optical trapping experiment was carried out and the optical fields generated by CBSA were used for trapping and rotating yeast cells.

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Generating Focused 3D Perfect Vortex Beams By Plasmonic Metasurfaces

Zhang

Liu

Gao

et al. 2018

Advanced Optical Materials

142

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from the Fourier transformation of the Bessel-Gauss (BG) beam, [13,14] by utilizing a series of free-space bulky optical components including axicon, spiral phase plate, Fourier transform lens, and spatial light modulator. This fact greatly increases the optical system complexity and also hinders the device integration in OAM-based photonic circuits.Recently, plasmonic metasurfaces made of subwavelength nanoantenna arrays in thin metallic films have provided a powerful and efficient platform for manipulating the intensity, wavefront, and polarization of light beams beyond the diffraction limit. [26,27] In contrast to the bulky optical components with wavelengthdependent phase shift based on optical path difference, in the Pancharatnam-Berry phase optical elements (PBOEs), the PB phase in broadband operation originating from the geometric phase and accompanied polarization conversion is introduced. [28][29][30][31][32][33][34] The PBOE-based metasurfaces have been widely designed for wavefront shaping applications in making on-chip structured beam generators, [35][36][37][38][39][40][41][42][43][44][45] flat lenses, [46][47][48][49] ultrathin wave plates, [50][51][52] and holograms. [53][54][55][56][57] In this work, we present PBOE-based plasmonic metasurfaces made of rectangular-hole nanoantenna arrays as integrated optical beam converters for the direct generation of the focused 3D PV beams, without using bulky optical components, such as axicon, lens, and spatial light modulator. The PB phase profiles encoded on metasurfaces are uniquely designed with the combined phase distributions of axicon, spiral phase plate, and Fourier transform lens. The single ultrathin plasmonic metasurface device with compact area of 50 µm × 50 µm can create 3D PV beam in a long propagation distance and operate in a broad wavelength range from 600 to 1000 nm, which is useful in wavelength-multiplexed OAM-based optical fiber communication. For comparison, the previously demonstrated PB phase element system used to produce PV beams contains three in-sequence metasurface plates with efficient diameters ≥6 mm fabricated in glass boards, with the single operating wavelength at 632.8 nm. [13] It is shown that the obtained PV beams have the almost constant vortex ring radius and the same beam divergence for different TCs. We also demonstrate that the PV beam structures can be easily adjusted by varying several control parameters in the metasurface design including axicon period, lens focal length, and operation wavelength. Furthermore, multiple PV beams with Perfect vortex (PV) beams possessing annular intensity profiles independent of topological charges promise significant advances in particle manipulation, fiber communication, and quantum optics. The PV beam is typically generated from the Fourier transformation of the Bessel-Gauss beam. However, the conventional method to produce PV beams requires a series of bulky optical components, which greatly increases the system complexity and also hinders the photonic device integration. Here, ...

show abstract

Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements

Cited by 10 publications

References 33 publications

All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser

All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser

Binary square axicon with chiral focusing properties for optical trapping

Generating Focused 3D Perfect Vortex Beams By Plasmonic Metasurfaces

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