Concentric ring metal grating for generating radially polarized light

Ghadyani, Z.; Vartiainen, Ismo; Harder, Irina; Iff, Wolfgang; Berger, Andreas; Lindlein, Norbert; Kuittinen, Markku

doi:10.1364/ao.50.002451

Cited by 47 publications

(35 citation statements)

References 10 publications

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“…A concentric-ring metal grating for generating radially polarized light of wavelength 633 nm from a circularly polarized beam has been discussed [8]. Using a similar approach, a terahertz vector radially polarized beam was generated in [9].…”

Section: Introductionmentioning

confidence: 99%

“…Using a similar approach, a terahertz vector radially polarized beam was generated in [9]. However, it is worthwhile noting that the beam discussed in [8] cannot be defined as being radially polarized in a strict sense. While being characterized by the radial polarization vector and a doughnut transverse intensity pattern, the beam's transverse phase distribution was not uniform.…”

Section: Introductionmentioning

confidence: 99%

“…While being characterized by the radial polarization vector and a doughnut transverse intensity pattern, the beam's transverse phase distribution was not uniform. As a remedy for the said drawback, a combined holographic element composed of a concentric metal ring [8] and a "fork" hologram was introduced in [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The first group [4,5,[8][9][10][11]] discusses the conversion of circularly polarized light into cylindrically symmetric beams. Being an analog of quarter-wave plates, such optical elements are easier to fabricate, as the grating microrelief features have a smaller aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

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Microlens-aided focusing of linearly and azimuthally polarized laser light

et al. 2016

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Abstract:We have investigated a four-Sector transmission Polarization Converter (4-SPC) for a wavelength of 633 nm, that enables the conversion of a linearly polarized incident beam into a mixture of linearly and azimuthally polarized beams. It was numerically shown that by placing a Fresnel zone plate of focal length 532 nm immediately after the 4-SPC, the incident light can be focused into an oblong subwavelength focal spot whose size is smaller than the diffraction limit (with width and breadth, respectively, measuring FWHM = 0.28λ and FWHM = 0.45λ, where λ is the incident wavelength and FWHM stands for full-width at half maximum of the intensity). After passing through the 4-SPC, light propagates in free space over a distance of 300 μm before being focused by a Fresnel zone plate (ZP), resulting in focal spot measuring 0.42λ and 0.81λ. The focal spot was measured by a near-field microscope SNOM, and the transverse E-field component of the focal spot was calculated to be 0.42λ and 0.59λ. This numerical result was verified experimentally, giving a focal spot of smaller and larger size, respectively, measuring 0.46λ and 0.57λ. To our knowledge, this is the first implementation of polarization conversion and subwavelength focusing of light using a pair of transmission micro-optic elements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microlens-aided focusing of linearly and azimuthally polarized laser light

et al. 2016

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“…25 WGP will be used here, because it offers highquality performance in the near UV-VIS wavelength range, in particular for the wavelength of 405 nm, a wavelength that can be used for, e.g., optical disc mastering and laser writing. Focused radially polarized light exhibits a spot-like longitudinal polarization component combined with a doughnut-like transversal polarization component.…”

Section: Introductionmentioning

confidence: 99%

Enhanced lithographic resolution using longitudinal polarization state of light

Van

Ushakova

Bastiaansen

et al. 2015

J. Micro/Nanolith. MEMS MOEMS

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Abstract. Laser direct-writing is an important technique for the fabrication of complex patterns. There is a continuous need for structures with increasingly small features, i.e., enhanced resolution. Focused radially polarized light is known to exhibit a narrow longitudinal polarization component. Here, a proof-of-concept is shown of enhanced resolution through polarization-selectivity by the selective recording of the longitudinal polarization component in a polarization-selective homeotropic and smectic B photoresist. The full-width-at-half-maximum (FWHM) of the fabricated spots in the polarization-selective resist is up to 56% smaller compared to the FWHM of the same spot in a photoresist that is not polarization-selective, which supports simulations that predict a theoretical maximum reduction of 62%. © 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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Vertically‐Stacked Discrete Plasmonic Meta‐Gratings for Broadband Space‐Variant Metasurfaces

Hassanfiroozi

Yang

Huang

et al. 2023

Advanced Optical Materials

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Reexamining the plasmonic metasurfaces for efficient transmissive nanophotonics devices has recently drawn considerable attention. It attributes to their ease of fabrication and tunability in terms of the excitation of abundant multipoles. Despite recent efforts in developing plasmonic meta‐atoms, meta‐gratings provide an ultimate solution that enables efficient conversion of the polarization in a broadband range, particularly at optical frequencies. In this work, by vertically stacking meta‐gratings whose bandwidths overlap with each other and possess no physical limitation, plasmon mode hybridization is introduced so that highly‐transmissive broadband plasmonic metasurfaces are realized. It is reported that the intra‐coupling in a discrete plasmonic meta‐grating plays a key role in geometric phase‐controlled metasurface design. As a proof of concept, a half‐wave plate using plasmonic meta‐gratings to convert the incident circularly‐polarized light in a wavelength range from 1106 to 1521 nm with a peak efficiency of 50.2% and a gradient metasurface with truncated discrete meta‐grating as building blocks for deflecting the light with a maximum of 32.60% are demonstrated. Finally, the physical picture is explained through the electric field distributions, mode coupling, and energy splitting. The presented framework may provide an optimized way to enhance efficiency and expand the bandwidth for plasmonic systems.

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Concentric ring metal grating for generating radially polarized light

Cited by 47 publications

References 10 publications

Microlens-aided focusing of linearly and azimuthally polarized laser light

Microlens-aided focusing of linearly and azimuthally polarized laser light

Enhanced lithographic resolution using longitudinal polarization state of light

Vertically‐Stacked Discrete Plasmonic Meta‐Gratings for Broadband Space‐Variant Metasurfaces

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