Strong optical activity from twisted-cross photonic metamaterials

Decker, Manuel; Rüther, Matthias; Kriegler, C. E.; Zhou, Jiangfeng; Soukoulis, Costas M.; Lindén, Stefan; Wegener, Martin

doi:10.1364/ol.34.002501

Cited by 312 publications

(273 citation statements)

References 18 publications

(25 reference statements)

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“…Pronounced chiral behaviours such as optical activity and circular dichroism were observed in the optical region based on nanoscaled bilayered chiral structures. [58][59][60] Very recently, light propagation through three-dimensional gold helices has been investigated in the mid-infrared region. 61 The structure can block the circular polarization with the same handedness as the helices, while it transmits the other with very high efficiency over a broad wavelength band (Fig.…”

Section: Chiral Metamaterialsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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Metamaterials, artificial composite structures with exotic material properties, have emerged as a new frontier of science involving physics, material science, engineering and chemistry. This critical review focuses on the fundamentals, recent progresses and future directions in the research of electromagnetic metamaterials. An introduction to metamaterials followed by a detailed elaboration on how to design unprecedented electromagnetic properties of metamaterials is presented. A number of intriguing phenomena and applications associated with metamaterials are discussed, including negative refraction, sub-diffraction-limited imaging, strong optical activities in chiral metamaterials, interaction of meta-atoms and transformation optics. Finally, we offer an outlook on future directions of metamaterials research including but not limited to three-dimensional optical metamaterials, nonlinear metamaterials and ''quantum'' perspectives of metamaterials (142 references).

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Section: Chiral Metamaterialsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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“…In part inspired by biological species that are well equipped with broadband, conformal circular polarization sensors 12 , optical activity and circular dichroism have been shown in either planar [13][14][15][16][17][18] or three-dimensional metamaterials 3,19,20 . Planar structures generally exhibit much weaker circular dichroism compared with 3D geometries, because an infinitesimally thin device is inherently achiral, and excitation at oblique incidence or some form of nonreciprocal response is required to distinguish between LCP and RCP transmissivity 21 .…”

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confidence: 99%

“…Planar structures generally exhibit much weaker circular dichroism compared with 3D geometries, because an infinitesimally thin device is inherently achiral, and excitation at oblique incidence or some form of nonreciprocal response is required to distinguish between LCP and RCP transmissivity 21 . In this context, the concept of extrinsic chirality has been recently put forward, showing that, by pairing two closely spaced planarized inclusions with some form of 3D chirality, may produce a narrow-band chiral response near their resonance [13][14][15][16][17][18] .…”

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confidence: 99%

Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

2012

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optical metamaterials are usually based on planarized, complex-shaped, resonant nanoinclusions. Three-dimensional geometries may provide a wider set of functionalities, including broadband chirality to manipulate circular polarization at the nanoscale, but their fabrication becomes challenging as their dimensions get smaller. Here we introduce a new paradigm for the realization of optical metamaterials, showing that three-dimensional effects may be obtained without complicated inclusions, but instead by tailoring the relative orientation within the lattice. We apply this concept to realize planarized, broadband bianisotropic metamaterials as stacked nanorod arrays with a tailored rotational twist. Because of the coupling among closely spaced twisted plasmonic metasurfaces, metamaterials realized with conventional lithography may effectively operate as three-dimensional helical structures with broadband bianisotropic optical response. The proposed concept is also shown to relax alignment requirements common in three-dimensional metamaterial designs. The realized sample constitutes an ultrathin, broadband circular polarizer that may be directly integrated within nanophotonic systems.

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“…However, these structures need oblique incidence of light to discriminate polarizations with opposite handedness and also exhibit weak dichroic selection. To maximize the interaction with light, chiral metamaterials should extrude along the third dimension, that is, by a stacked arrangement of a unit cell (quasi-three-dimensional (3D) objects) [10][11][12][13][14][15] . In particular, fully 3D helix-based metamaterials can be considered as the best candidates for pronounced chiral response integrated in compact devices, as demonstrated by the fully 3D helical metamaterials acting as circular polarizers in the infrared range 2 , and realized by direct laser writing.…”

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confidence: 99%

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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Strong optical activity from twisted-cross photonic metamaterials

Cited by 312 publications

References 18 publications

Metamaterials: a new frontier of science and technology

Metamaterials: a new frontier of science and technology

Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

Triple-helical nanowires by tomographic rotatory growth for chiral photonics

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