Midrefractive Dielectric Modulator for Broadband Unidirectional Scattering and Effective Radiative Tailoring in the Visible Region

Liu, Pu; Yan, Jiahao; Ma, Churong; Lin, Zhaoyong; Yang, Guowei

doi:10.1021/acsami.6b05123

Cited by 27 publications

(27 citation statements)

References 37 publications

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“…According to previous reports [28][29][30], directional scattering is an important feature of Mie scattering. Here, the forward and backward scattering spectra of the three OFs were measured with the detecting angle at 35°( Fig.…”

Section: Resultsmentioning

confidence: 93%

Sharp scattering spectra induced brilliant and directional structural colors

Zhang

et al. 2020

Sci. China Mater.

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Structural color materials, which generate colors through the interaction between light and nano-microstructures, have always been research hotspots in the fields of display, anticounterfeiting and stimuli-responsive materials. Structural colors based on scattering have received increasing attention due to their wider viewing angles than that originating from the specular reflection of photonic crystals. However, the wide scattering spectrum of an amorphous structure leads to lower purity and brightness of the appeared colors. Few researchers have focused on the scattering of ordered structures due to their strong reflection and diffraction in the visible regions. In this work, by building ordered films (OFs) using SiO 2 spheres (refractive index n = 1.46) with a diameter of 300-500 nm, for the first time, sharp scattering spectra with narrow full width at half-maximum (FWHM, 24 nm) were generated. Importantly, under ambient light, brilliant colors covering the entire visible region can be observed, and a formula was proposed to calculate the scattering spectra of OFs. Moreover, rainbow structural color was realized under irradiation of the nonparallel light, and fullspectrum structural color patterns were fabricated using building blocks with a single particle size by a spraying method. Finally, a composite structure was constructed to explore possibilities in the field of flexible transparent displays.

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Section: Resultsmentioning

confidence: 93%

Sharp scattering spectra induced brilliant and directional structural colors

Zhang

et al. 2020

Sci. China Mater.

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“…[138,139] Dielectric nanoparticles with moderate refractive indexes for directional light scattering are therefore attracting much attention recently, such as Cu 2 O, [140] TiO 2 , [141] and B. [142] Cu 2 O is a p-type semiconductor. Its real and imaginary parts of the refractive index are ≈2.7 and ≈0.2, respectively.…”

Section: Single Nanoparticlesmentioning

confidence: 99%

Directional Control of Light with Nanoantennas

Lai

Lam

et al. 2020

Advanced Optical Materials

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research fields, such as medicine, biology, and materials science. [1] These different types of optical components usually utilize the reflection, refraction, and diffraction of light to reshape the wavefronts and control the propagation direction of light in real space. [2] Although great achievements have been made in controlling light in various scopes, it is still challenging to manipulate the light direction at the subwavelength scale with the conventional optical devices. [3] The major constraint of controlling light at nanoscale is the diffraction limit of light, where the smallest resolvable feature is at the wavelength scale. The limited resolution hinders the observation of many intriguing phenomena and features at the subwavelength scale, such as biomolecules, cell components, nanoparticles and nanoscale devices. [4-7] New techniques are therefore highly demanded for subwavelength light manipulation. Nanoparticles have been introduced as a bridge to connect the gap between the macroscopic and the microscopic scale owing to their extraordinary optical properties in the manipulation of light. [8,9] In order to design nanoantennas with nanoparticles, many ideas have been borrowed from conventional macroscopic schemes. One of the most famous examples is Yagi-Uda antennas. This antenna structure was first invented by Hidetsugu Yagi and Shintaro Uda in 1926. [10] The traditional Yagi-Uda antennas are usually composed of multiple parallel elements in a line, usually halfwave dipoles made of metal rods, which function as a reflector, a driving element (feed), and several directors. Each director reradiates the electromagnetic waves from the driving element at a different phase, and the reradiated waves from the multiple directors superpose and interfere to enhance the radiation in a single direction. The Yagi-Uda antennas have been widely used in analog television, shortwave communication links, radar antennas, and broadcasting stations. Inspired by this idea, Yagi-Uda nanoantennas consisting of a reflector, a feed, and several directors have also been invented. As the nanoscale counterpart, Yagi-Uda nanoantennas can redirect light emission in a desired direction with a narrow angle and enhanced signal intensity in a nanoscale region. [11,12] The detailed analysis of different Yagi-Uda nanoantennas will be introduced in Sections 3-5. The inspiring work has opened a new era for directional light control at the subwavelength scale. After the development for a decade, the techniques for directional light scattering and emitting have been enriched. Many different Light manipulation has been widely employed in lighting, display, and energy storage, becoming an inseparable part of human lives. However, the conventional optical devices suffer from the diffraction limit of electromagnetic waves. To overcome the limitation, plasmonic and dielectric nanoantennas are introduced for the control of light direction at nanoscale. The directionality of the nanoantennas stems from their electromagnetic resonance properties or ...

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“…On the contrary, the electric and magnetic modes supported by moderate‐refractive‐index nanoparticles tend to largely overlap with each other. Such different spectral features lead to distinct optical properties . The dielectric nanostructures in previous works have dominantly been fabricated by physical methods, such as femtosecond laser ablation and electron‐beam lithography .…”

mentioning

confidence: 99%

“…Such different spectral features lead to distinct optical properties . The dielectric nanostructures in previous works have dominantly been fabricated by physical methods, such as femtosecond laser ablation and electron‐beam lithography . In particular, the fabrication of patterns of dielectric nanomaterials by electron‐beam lithography is more complicated than that of plasmonic nanomaterials, since the deposition of thin films of dielectric materials on substrates usually requires chemical vapor deposition, atomic layer deposition and other techniques.…”

mentioning

confidence: 99%

Chemically Synthesized Electromagnetic Metal Oxide Nanoresonators

Zhuo

Cheng

Guo

et al. 2019

Advanced Optical Materials

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and breakthroughs by use of dielectric nanoparticles as building blocks, such as structural coloring, [6][7][8] directional light scattering, [9][10][11][12][13] optical chirality, [14] surfaceenhanced spectroscopies, [15,16] light-matter strong coupling, [17][18][19] and multifunctional metasurfaces. [20][21][22] The most common dielectric materials include semiconductors with high refractive indexes above 3.5 (Si, Ge, GaAs) and metal oxides with moderate refractive indexes around 2-3 (TiO 2 , ZrO 2 , ZnO, Cu 2 O). High-refractive-index nanoparticles tend to exhibit well-separated electric and magnetic resonance peaks in their extinction/scattering spectra. On the contrary, the electric and magnetic modes supported by moderate-refractive-index nanoparticles tend to largely overlap with each other. Such different spectral features lead to distinct optical properties. [23] The dielectric nanostructures in previous works have dominantly been fabricated by physical methods, such as femtosecond laser ablation and electron-beam lithography. [4][5][6][7][8][9]11,14,[20][21][22][23] In particular, the fabrication of patterns of dielectric nanomaterials by electron-beam lithography is more complicated than that of plasmonic nanomaterials, since the deposition of thin films of dielectric materials on substrates usually requires chemical vapor deposition, atomic layer deposition and other techniques. Only a few studies have so far demonstrated the chemical synthesis of monodisperse dielectric nanoparticles, including silicon, [24] titania, [25][26][27][28] and cuprous oxide. [10,29] In addition, chemical vapor deposition and aerosol spray have also been developed for the preparation of dielectric sub-micrometer spheres with broad size distributions. [30][31][32] In general, the chemical methods are more facile, cost-efficient and therefore more desirable for large-scale production than the physical methods. Among the aforementioned methods, the aerosol spray method is the most general and powerful one for synthesizing different types of dielectric nanoparticles, including various monometallic metal oxide and complex metal oxide nanoparticles. [33][34][35][36] However, a majority of the previous studies on aerosol spray have focused on the production of mesoporous or hollow metal oxides for catalysis and gas sensing. [35][36][37][38][39] Little attention has been paid to its ability in producing solid and dense metal oxides with high or moderate refractive indexes.In the family of metal oxides, TiO 2 has been recognized as a low-loss and high-performance material for all-dielectric nanophotonics governed by Mie resonances, [40,41] in additionMetal oxide nanostructures represent a large class of dielectric nanomaterials with high or moderate refractive indexes. Dielectric nanomaterials have recently attracted much attention in the field of all-dielectric nanophotonics. They can support both electric and magnetic resonances without suffering from high losses or heating as their plasmonic counterparts. Although various intrig...

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Midrefractive Dielectric Modulator for Broadband Unidirectional Scattering and Effective Radiative Tailoring in the Visible Region

Cited by 27 publications

References 37 publications

Sharp scattering spectra induced brilliant and directional structural colors

Sharp scattering spectra induced brilliant and directional structural colors

Directional Control of Light with Nanoantennas

Chemically Synthesized Electromagnetic Metal Oxide Nanoresonators

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