Polarization tunable all-dielectric color filters based on cross-shaped Si nanoantennas

Vashistha, Vishal; Vaidya, Gayatri; Gruszecki, Paweł; Serebryannikov, Andriy E.; Krawczyk, Maciej

doi:10.1038/s41598-017-07986-z

Cited by 47 publications

(33 citation statements)

References 44 publications

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“…Choosing a convenient illumination geometry, where the light of a white LED is coupled within the glass slide, only the fundamental modes of the Mie resonators are illuminated and can out couple the light from the slab. This is due to the larger coupling of these resonances with the substrate with respect to higher order multipolar modes that are more strongly confined within the pillars and do not appear in the spectra. This property provides sharp band‐pass filters potentially important for the use of these devices as ink‐free colors and displays, although in this case a large dynamic tuning of the structural color is not possible.…”

Section: Discussionmentioning

confidence: 99%

“…Top‐down fabrication approaches limit the full exploitation of Mie resonators for unexpensive devices and broad areas production. In particular, given the rapidly rising interest in structural coloring and light filtering with dielectric metasurfaces a versatile and scalable method is highly desirable to overcome the gap separating mere proof of principles and industrial applications. In this framework, a major step forward would be the development of fabrication techniques fully compatible with back‐end processing of C‐MOS circuitry (e.g., keeping the maximal processing temperature below ≈450 °C) or more generally, on electronic devices such as LEDs and photovoltaic panels.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional Metasurfaces Based on Direct Nanoimprint of Titania Sol–Gel Coatings

Checcucci

Bottein

Gurioli

et al. 2019

Advanced Optical Materials

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shaping, [12][13][14] sensing, [15,16] and nonlinear phenomena [17][18][19][20] are few examples demonstrating the strength of this approach for light management with sub-wavelength dielectric structures. However, with a few exceptions based on colloidal assembly, [21][22][23] hydrothermal growth, [20] solid state dewetting, [24][25][26][27][28][29][30] and aerosol spray, [31] most of these achievements were based on complex and expensive fabrication methods involving several steps (such as e-beam lithography and reactive ion etching). Top-down fabrication approaches limit the full exploitation of Mie resonators for unexpensive devices and broad areas production. In particular, given the rapidly rising interest in structural coloring and light filtering with dielectric metasurfaces [32][33][34][35][36][37][38][39][40][41] a versatile and scalable method is highly desirable to overcome the gap separating mere proof of principles and industrial applications. In this framework, a major step forward would be the development of fabrication techniques fully compatible with back-end processing of C-MOS circuitry (e.g., keeping the maximal processing temperature below ≈450 °C) or more generally, on electronic devices such as LEDs and photovoltaic panels.So far, most studies on Mie resonators are based on Si or Ge materials, due to both their very large index of refraction and the possibility to exploit the well-developed nanofabrication approaches of nanoelectronics and nanophotonics. Among other materials, TiO 2 (titania) is recently attracting growing interest [35,[42][43][44][45][46] for its transparency up to near-UV frequencies and its relatively high refractive index. Indeed, TiO 2 -based Mie resonators systems can potentially outperform conventional Si and Ge-based dielectric metasurfaces, which suffer from larger absorption at short wavelength [47,48] (e.g., at 450 nm: n TiO2 = 2.55, k TiO2 = 1.2 × 10 −5 ; n Si = 4.5; k Si = 0.13; n Ge = 4; and k Ge = 2.24). A quite unique peculiarity of titania is the tunable porosity (adjustable by modifying the sol-gel fabrication process) and therefore permeability to liquids and gas. In addition to this, titania is an abundant, cheap, nontoxic, photocatalytic, mechanically strong, and chemically stable material, featuring a relatively low mass density (≈3.8 g cm −3 in the anatase form against ≈5 g cm −3 for MoS 2 ). These features make titania an ideal metamaterial providing several functions (e.g., tunable structural color, sensing small changes in the environment), for a novel photonic platform in view of multifunctional devices. Dielectric Mie resonators are taking momentum in the last years thanks to their peculiar properties in light management at visible and near-infrared frequencies. However, their full exploitation demands for cheap materials and versatile fabrication methods, extendible over large surfaces and potentially C-MOS compatible. Here, a sol-gel deposition and nanoimprint lithography method is used to obtain titania-based Mie resonators over large areas (s...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multifunctional Metasurfaces Based on Direct Nanoimprint of Titania Sol–Gel Coatings

Checcucci

Bottein

Gurioli

et al. 2019

Advanced Optical Materials

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“…As its geometric dimensions are comparable to the wavelength of visible light, a periodic array of nanostructures exhibits optical resonances at visible wavelength, thereby producing color that corresponds to the scattering spectrum. The structural color generation by the metasurfaces has been successfully demonstrated in plasmonics [1][2][3][4][5][6] and dielectric systems [7][8][9][10][11] using a variety of designs (See review papers [12][13][14][15][16] for details). However, as the geometry of nanostructures specifies scattering properties, an array of nanostructures usually produces only one fixed color.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, dynamic color printing can be realized in a far simpler system by polarization control without involving any external stimuli [30][31][32]. A periodic array of cross-shaped nanoantennas [8,[33][34][35], elliptical nanostructures [31,32,36], rectangle nanostructures [37] and a grating pattern [38] have demonstrated active color printing by rotating incident polarization. Here, lack of four-fold symmetry leads to active color generation.…”

Section: Introductionmentioning

confidence: 99%

“…Here, lack of four-fold symmetry leads to active color generation. However, previously demonstrated structures cannot support wide range of colors as they generate linearly varying color gamut [33] or cover partial space [8,38] in a chromaticity diagram using one unit design. Meanwhile, generation of three primary colors: red, green and blue in a single system, has been reported by adopting three cavities of different shapes and directions altogether [30].…”

Section: Introductionmentioning

confidence: 99%

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Active Color Control in a Metasurface by Polarization Rotation

Kim

Jang

et al. 2018

Applied Sciences

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Abstract:Generating colors by employing metallic nanostructures has attracted intensive scientific attention recently, because one can easily realize higher spatial resolution and highly robust colors compared to conventional pigment. However, since the scattering spectra and thereby the resultant colors are determined by the nanostructure geometries, only one fixed color can be produced by one design and a whole new sample is required to generate a different color. In this paper, we demonstrate active metasurface, which shows a range of colors dependent on incident polarization by selectively exciting three different plasmonic nanorods. The metasurface, which does not include any tunable materials or external stimuli, will be beneficial in real-life applications especially in the display applications.

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Titania‐Based Spherical Mie Resonators Elaborated by High‐Throughput Aerosol Spray: Single Object Investigation

Checcucci

Bottein

Claude

et al. 2018

Adv Funct Materials

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/adfm.201801958. tives to replace complex and bulky optical elements. This unique ability is due to strong modifications of the local density of optical states occurring in sub-micrometric objects made of materials featuring high dielectric constant and sufficiently small absorption losses.Most studies over the last years have mainly addressed silicon- [4][5][6][7][8][9][10] and germanium-based [11][12][13][14] Mie resonators, demonstrating that they could outperform their metallic counterpart supporting localized plasmonic resonances. However, the large absorption of group IV semiconductor compounds at short wavelengths induces strong optical losses, limiting their potential applicability as efficient devices especially at blue and near-UV frequencies [15,16] (e.g. at 450 nm: n Si = 4.5, k Si = 0.13; n Ge = 4.0, k Ge = 2.24). Furthermore, with a few exception based on colloids [4,17,18] and solid state dewetting, [13,[19][20][21][22][23] typical nanofabrication methods of Si(Ge)-based Mie resonators rely on top-down technologies that are not easy to scale-up at affordable prices.TiO 2 -based optical devices are an interesting alternative to Si, since Titania has a relatively high refractive index and is fully transparent up to UV frequencies [24,25] (e.g.: at 450 nm: n TiO2 = 2.55, k TiO2 = 1.2 × 10 −5 ; at 370 nm: n TiO2 = 2.83, k TiO2 = 1 × 10 −3 ) rendering it, for instance, a strategic material to manipulate the light emitted by conventional GaN-based blue LEDs (at about 450 nm). TiO 2 can be prepared by high-throughput chemical processes, which is a prerequisite for applications requiring large surface systems. It also has many other advantages over Si and metals that are its high chemical, mechanical, and thermal stability, nontoxicity, and relative natural abundance.To date, several groups have studied the properties of Titania particles as dielectric resonators prepared using conventional top-down microfabrication technologies [26][27][28][29][30] or soft-nanoimprint lithography. [31,32] They all confirmed that electromagnetic resonances could be generated within these metal oxide objects. However, the limited exploitation of this material is mainly due to the difficulty in applying conventional top-down fabrication methods to TiO 2 . Additionally, such approaches do not allow the preparation of spherical resonators, [33] which may be interesting for many applications with effective metamaterials, such as beam steering and back-scattering-free optics, [11,[34][35][36][37][38][39][40][41][42][43][44][45]

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Polarization tunable all-dielectric color filters based on cross-shaped Si nanoantennas

Cited by 47 publications

References 44 publications

Multifunctional Metasurfaces Based on Direct Nanoimprint of Titania Sol–Gel Coatings

Multifunctional Metasurfaces Based on Direct Nanoimprint of Titania Sol–Gel Coatings

Active Color Control in a Metasurface by Polarization Rotation

Titania‐Based Spherical Mie Resonators Elaborated by High‐Throughput Aerosol Spray: Single Object Investigation

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