Color-Selective and Versatile Light Steering with up-Scalable Subwavelength Planar Optics

Quaranta, Giorgio; Basset, Guillaume; Martin, Olivier J. F.; Gallinet, Benjamin

doi:10.1021/acsphotonics.7b00232

Cited by 15 publications

(35 citation statements)

References 44 publications

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“…However, since large patterns require the stitching of multiple deflections field of an electron beam, stitching errors can create irregularities in the pattern for sample dimensions in the hundred micron to millimeter scales . Recent developments for large‐area electron beam exposure have reached exposure speeds of 1 min mm −2 for non‐tilted gratings with a 560 nm period, and 3 min mm −2 for tilted gratings with a 200–500 nm period …”

Section: Fabrication Techniques Implementations and Materialsmentioning

confidence: 99%

“…Subwavelength structures are able to support to some extent both localized and non‐localized quasi‐guided resonances, we review here only the latter. A focusing device has recently been demonstrated for operation with low‐coherence sources such as white LEDs, by patterning two impedance‐matched RWGs (Figure e–h) . In that geometry, both gratings share a thin high refractive index waveguide and are therefore impedance matched.…”

Section: Effects Associated With Rwgsmentioning

confidence: 99%

Section: Effects Associated With Rwgsmentioning

confidence: 99%

“…Since the first implementation on passport in 2003, not a single counterfeiting or lure of the DID could be reported despite their use in more than 40 countries. Various new developments and variations allow designing different control protocols and viewing angles (Figure b) or control using readers such as smartphones (Figure c) …”

Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

See 4 more Smart Citations

Recent Advances in Resonant Waveguide Gratings

Quaranta

Basset

Martin

et al. 2018

Laser & Photonics Reviews

Self Cite

321

199

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Resonant waveguide gratings (RWGs), also known as guided mode resonant (GMR) gratings or waveguide‐mode resonant gratings, are dielectric structures where these resonant diffractive elements benefit from lateral leaky guided modes from UV to microwave frequencies in many different configurations. A broad range of optical effects are obtained using RWGs such as waveguide coupling, filtering, focusing, field enhancement and nonlinear effects, magneto‐optical Kerr effect, or electromagnetically induced transparency. Thanks to their high degree of optical tunability (wavelength, phase, polarization, intensity) and the variety of fabrication processes and materials available, RWGs have been implemented in a broad scope of applications in research and industry: refractive index and fluorescence biosensors, solar cells and photodetectors, signal processing, polarizers and wave plates, spectrometers, active tunable filters, mirrors for lasers and optical security features. The aim of this review is to discuss the latest developments in the field including numerical modeling, manufacturing, the physics, and applications of RWGs. Scientists and engineers interested in using RWGs for their application will also find links to the standard tools and references in modeling and fabrication according to their needs.

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Section: Fabrication Techniques Implementations and Materialsmentioning

confidence: 99%

Section: Effects Associated With Rwgsmentioning

confidence: 99%

Section: Effects Associated With Rwgsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

See 3 more Smart Citations

Recent Advances in Resonant Waveguide Gratings

Quaranta

Basset

Martin

et al. 2018

Laser & Photonics Reviews

Self Cite

321

199

View full text Add to dashboard Cite

show abstract

Fabrication of High‐Aspect Ratio Nanogratings for Phase‐Based X‐Ray Imaging

Michalska

Kokot

Macdonald

et al. 2023

Adv Funct Materials

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Diffractive optical elements such as periodic gratings are fundamental devices in X-ray imaging -a technique that medical, material science, and security scans rely upon. Fabrication of such structures with high aspect ratios at the nanoscale creates opportunities to further advance such applications, especially in terms of relaxing X-ray source coherence requirements. This is because typical grating-based X-ray phase imaging techniques (e.g., Talbot self-imaging) require a coherence length of at least one grating period and ideally longer. In this paper, the fabrication challenges in achieving high-aspect ratio nanogratings filled with gold are addressed by a combination of laser interference and nanoimprint lithography, physical vapor deposition, metal assisted chemical etching (MACE), and electroplating. This relatively simple and cost-efficient approach is unlocked by an innovative post-MACE drying step with hexamethyldisilazane, which effectively minimizes the stiction of the nanostructures. The theoretical limits of the approach are discussed and, experimentally, X-ray nanogratings with aspect ratios >40 are demonstrated. Finally, their excellent diffractive abilities are shown when exposed to a hard (12.2 keV) monochromatic X-ray beam at a synchrotron facility, and thus potential applicability in phase-based X-ray imaging.

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Plasmonic Metalens for Narrowband Dual‐Focus Imaging

Williams

Montelongo

Wilkinson

2017

Advanced Optical Materials

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toolbox for a plethora of applications in reduced form factors. [2] With the continual shrinking of optical systems-from the macro-to-micro optical realms [2] -the inevitable form factor reduction of DOEs leads to two important disadvantages, which arise from their diffractive nature. The first is a result of the relatively large dimensions necessary to observe diffraction. According to the geometrical theory of diffraction (GTD), [3] to observe a considerable wave perturbation, features with dimensions ⩾ λ/2 are necessary. Although the GTD predicts arbitrary numerical apertures (NA), the physical dimension to produce diffraction imposes a physical constraint. [4] The second disadvantage arises from the lack of functionality of the diffractive structures, which are restricted in order to create constructive interference at the focal point. In recent years, the advent of nanophotonic devices-based on the control of the optical wavefront over subwavelength length scales-has opened up a new class of planar optical element: the metasurface. [5][6][7][8][9] Optical metasurfaces present a route toward enhancing the DOE further, whereby the control of highly localized optical fields across the element can impart additional optical functionality such as amplitude, wavelength, polarization, and phase modulation. [5,6,9,10] The unique light-matter interaction with nanostructured metals leads to the excitation of localized surface plasmon polari tons, resulting in highly pronounced and tunable scattering cross-sections. [5,[11][12][13] With noble metals, this behavior occurs at visible wavelengths [12,14] and through tailored arrays of such subwavelength scatterers (metasurfaces) arbitrary control of the optical wavefront is possible. A myriad of metasurface devices have been previously demonstrated, including beam shapers, polarizers, and lenses, referred to as metalenses. [9,[15][16][17][18] Previous work, either metallic(plasmon-based) or, more recently, dielectric-based metasurfaces, generally aim to mimic functionality of conventional broadband optical elements but through ultrathin form factors, termed flat optics. [8,9,[19][20][21] However, utilization of the unique optical properties of metallic-or-dielectricbased nanoscale resonators [9] -such as strong wavelength or polarization dependence-in combination with well established DOEs, for more elaborate design schemes, has great potential.In this work, we introduce a plasmonic-enhanced metalens which has the ability to selectively focus light of a certain wavelength, to two different focal planes, depending on polarization state. Through tailored arrays of ultrathin plasmonic nanostructures on silicon, we experimentally demonstrate two types of reflective metalens: a Fresnel zone plate and a photon sieve; with dual-focusing capability, dependent

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Color-Selective and Versatile Light Steering with up-Scalable Subwavelength Planar Optics

Cited by 15 publications

References 44 publications

Recent Advances in Resonant Waveguide Gratings

Recent Advances in Resonant Waveguide Gratings

Fabrication of High‐Aspect Ratio Nanogratings for Phase‐Based X‐Ray Imaging

Plasmonic Metalens for Narrowband Dual‐Focus Imaging

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