Three Dimensional Chiral Metamaterial Nanospirals in the Visible Range by Vertically Compensated Focused Ion Beam Induced‐Deposition

Esposito, Marco; Tasco, V.; Todisco, Francesco; Benedetti, Alessio; Sanvitto, D.; Passaseo, A.

doi:10.1002/adom.201300323

Cited by 118 publications

(87 citation statements)

References 22 publications

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“…The FIBID technique was already demonstrated to be a powerful tool for manufacturing 3D chiral structures at the nanoscale 22 ; however, the realization of intertwined helical structures by FIBID presents two additional technological challenges. One is the difficulty to extrude the nanowires in the third dimension because of the presence of blind spots (that is, the space occupied by the elements already grown).…”

Section: Resultsmentioning

confidence: 99%

“…The FIBID beam and pattern parameters were optimized following the procedure reported in ref. 22, where is also described the dose compensation procedure used to strongly reduce the 3D proximity effects that, for the THN growth, was further implemented by using a continuous gradient function for dose correction. For the subsequent beam scan, the same pattern is repeated anticlockwise rotating by 60°, thus inducing the deposition of the arches arranged every 120°(indicated in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…22) under normal incidence illumination of a tungsten lamp. Circular polarization excitation was achieved using a combination of a linear polarizer and an achromatic quarter-wave plate.…”

Section: Discussionmentioning

confidence: 99%

“…Tapered gold-helix metamaterials 21 were designed with direct laser writing to broaden the operation bandwidth in the THz region and reduce polarization intensity conversion 20 . Recently, using the focused ion beam-induced deposition (FIBID) technology, it has been possible to reach a broadband CD in the near-infrared optical region reducing the helix dimension to submicron size 22 . Wide band circular dichroic properties in the visible range were also demonstrated by planar stacked structures 15 , while 3D bichiral photonic crystals 23,24 , thought to limit the dependence of chiral effects on structure orientation, lead to the reduction of the infrared bandwidth.…”

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confidence: 99%

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Triple-helical nanowires by tomographic rotatory growth for chiral photonics

et al. 2015

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Three dimensional helical chiral metamaterials resulted in effective manipulation of circularly polarized light in the visible infrared for advanced nanophotonics. Their potentialities are severely limited by the lack of full rotational symmetry preventing broadband operation, high signal-to-noise ratio and inducing high optical activity sensitivity to structure orientation. Complex intertwined three dimensional structures such as multiple-helical nanowires could overcome these limitations, allowing the achievement of several chiro-optical effects combining chirality and isotropy. Here we report three dimensional triple-helical nanowires, engineered by the innovative tomographic rotatory growth, on the basis of focused ion beam-induced deposition. These three dimensional nanostructures show up to 37% of circular dichroism in a broad range (500-1,000 nm), with a high signal-to-noise ratio (up to 24 dB). Optical activity of up to 8°only due to the circular birefringence is also shown, tracing the way towards chiral photonic devices that can be integrated in optical nanocircuits to modulate the visible light polarization.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…22) under normal incidence illumination of a tungsten lamp. Circular polarization excitation was achieved using a combination of a linear polarizer and an achromatic quarter-wave plate.…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Triple-helical nanowires by tomographic rotatory growth for chiral photonics

et al. 2015

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“…9 Till now, circular polarizers based on helix structures are still believed as the broadest circular polarizer's candidates. 10 Various special fabrication process are proposed besides direct laser writing, such as focused ion beam induced-deposition (FIBID), 11 on-edge lithography (OEL), 12 glancing angle deposition (GLAD), 13 tomographic rotatory growth (TRG) 10 and so on. However, none of the above fabrication methods is compatible with other linear polarizer units' fabrication process to integrate on a chip, which is usually electron beam lithography or conventional lithographic techniques.…”

Section: Introductionmentioning

confidence: 99%

Broadband circular polarizers constructed using helix-like chiral metamaterials

Wang

Liu

et al. 2016

Nanoscale

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In this paper, a kind of helix-like chiral metamaterial, which can be realized with multiple conventional lithography or electron beam lithographic techniques, is proposed to achieve broadband bianisotropic optical response analogous to helical metamaterial. On the basis of twisted metamaterial, via tailoring the relative orientation within the lattice, the anisotropy of arc is converted into magneto-electric coupling of closely spaced arc pairs, which leads to a broad bianisotropic optical response. By connecting the adjacent upper and lower arcs, the coupling of metasurface pairs is transformed to the coupling of the three-dimensional inclusions, and provides a much broader and higher bianisotropic optical response. For only a four-layer helix-like metamaterial, the maximum extinction ratio can reach 19.7. The operation band is in the wavelength range from 4.69 μm to 8.98 μm with an average extinction ratio of 6.9. And the transmittance for selective polarization is above 0.8 in the entire operation band. Such a structure is promising for integratable and scalable broadband circular polarizers, especially has great potential to act as broadband circular micropolarizers in the field of the full-stokes division of focal plane polarimeters.

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3D Metaphotonic Nanostructures with Intrinsic Chirality

Qiu

Zhang

Tang

et al. 2018

Adv Funct Materials

124

102

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Chirality is a universal geometric property in both micro‐ and macroworlds. Recently, optical chiral effects have drawn increased attention due to their great potential in fundamental studies and practical applications. Significantly, the optical chiral response of artificial structures can be enhanced by orders of magnitude compared to that of their naturally occurring counterparts. These man‐made structures generally exhibit two types of optical chirality: extrinsic chirality and intrinsic chirality. The former relies on external illumination conditions, while the latter arises from the geometric characteristics of 3D objects. Herein, this review mainly focuses on the intrinsic chirality of artificial structures and discusses the existing realizations based on their design principles. In particular, an overview is given of the recent demonstrations of nonlinear optical effects in chiral structures and active chiral structures. Lastly, some promising prospects for future studies in the field are outlined.

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Three Dimensional Chiral Metamaterial Nanospirals in the Visible Range by Vertically Compensated Focused Ion Beam Induced‐Deposition

Cited by 118 publications

References 22 publications

Triple-helical nanowires by tomographic rotatory growth for chiral photonics

Triple-helical nanowires by tomographic rotatory growth for chiral photonics

Broadband circular polarizers constructed using helix-like chiral metamaterials

3D Metaphotonic Nanostructures with Intrinsic Chirality

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