Strong suppression of forward or backward Mie scattering by using spatial coherence

Wang, Yangyundou; Schouten, Hugo F.; Visser, Taco D.

doi:10.1364/josaa.33.000513

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…This phenomenon could be well explained by geometric optics. However, the sizes of b-Si surface nanostructures are similar to the light wavelengths, leading to largely enhanced scattering (Mie scattering). , As is illustrated in Figure b,c, most of the scattering behavior belongs to forward scattering, and a tiny part is the backward scattering . The forward scattering light leads to strong absorption by b-Si structure, while the backward scattered light was also detected (as the little difference between the specular reflection and total reflection in Figure a,c).…”

Section: Resultsmentioning

confidence: 89%

“…43,44 As is illustrated in Figure 5b,c, most of the scattering behavior belongs to forward scattering, 45 and a tiny part is the backward scattering. 46 The forward scattering light leads to strong absorption by b-Si structure, while the backward scattered light was also detected (as the little difference between the specular reflection and total reflection in Figure 4a,c). When the structural height increases with increasing etching time, multiple scattering or more times of scattering can occur and absorption is further increased.…”

Section: Resultsmentioning

confidence: 92%

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Photo-Thermoelectric Conversion Using Black Silicon with Enhanced Light Trapping Performance far beyond the Band Edge Absorption

Cheng

Wang

Müller

et al. 2021

ACS Appl. Mater. Interfaces

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During the past years, much research work has been focused on efficiently harvesting solar energy with black silicon (b-Si). However, semiconductor Si can only utilize solar energy with wavelength smaller than λ = 1110 nm (bandgap E g = 1.12 eV) for photovoltaic applications or photoelectrochemical conversions. Light with wavelength beyond the band edge (above λ = 1110 nm) cannot be used. Here, we prepared highly conductive b-Si without an apparent optical bandgap by a reactive ion etching process, which can largely absorb light with a wide range wavelength and even far into the near-infrared region (∼2500 nm). The optimized b-Si with surface texture shows the specular reflection rate lower than 0.1% and the average total reflection (specular reflectance + diffuse reflectance) is about 1.1%. Additionally, we briefly introduce the mechanism and reflection principle of surface nanostructured b-Si. By using b-Si structured material, we successfully convert the solar energy to electric power via photo-thermoelectric conversion, especially solar energy exceeding 1110 nm wavelength can also be efficiently used. The excellent light trapping of sunlight shows great potential for photothermal applications, such as photothermal imaging, seawater desalination, and further applications.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 92%

Photo-Thermoelectric Conversion Using Black Silicon with Enhanced Light Trapping Performance far beyond the Band Edge Absorption

Cheng

Wang

Müller

et al. 2021

ACS Appl. Mater. Interfaces

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“…One important work was done by Kerker, who discovered unidirectional scattering for some kinds of particles in specific conditions using Mie theory [8][9] . After his work, the strong research value and commercial potential of unidirectional scattering has attracted many researches [10][11] . However, most researches are focused on electrical or magnetic resonance or Kerker conditions with a single, unchanged pure nanoparticle 12 or core-shell nanoparticle 13 , not one we can control dynamically.…”

Section: Introductionmentioning

confidence: 99%

Controllable optical resonances and unidirectional scattering by core-shell nanoparticles

Dong

Yang

2021

J. Phys.: Conf. Ser.

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Nanoparticles supporting a distinct series of Mie resonances have enabled a new class of nanoantennas and provide efficient ways to manipulate light at the nanoscale. The ability to flexibly tune the optical resonances and scattering directionality are particularly essential for various applications ranging from biosensing to nanolasers. In this paper, we investigate the core-shell nanoparticles that support both electric and magnetic Mie resonances and for the first time systematically reveal the mode evolution from a pure high-index dielectric nanosphere to its plasmonic counterpart. Abrupt mode transition and hybridization of Mie resonances are found in Ag-dielectric core-shell spheres when core-shell ratio increases from 0.4 to 0.5. Furthermore, by engineering the electric and magnetic resonances, we demonstrate the unidirectional forward and backward scattering in such a system and reveal its tunability via geometric tuning.

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“…An efficient control of the optical radiation at subwavelength scales, e.g., suppressing the unwanted backward scattering (BS) and enhancing the directional forward scattering (FS) is one of the most crucial issues and plays an important role for various applications, such as cloaking, bio-sensing, and superlenses. [20,21,22,23,24,25,26]. In the field of anomalous electromagnetic scattering, pioneering work can be traced to Kerker et al [27], who systematically analyzed the light scattering of small magneto–dielectric spheres.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Substrate Effect on the Zero-Backward Scattering Condition of a Cu2O Nanoparticle under Non-Normal Illumination

et al. 2019

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The presence of a substrate is one of the most important limitations of the real application of the directional conditions. These conditions allow the control of the spatial distribution of light scattering of nanoparticles. While the zero-forward condition is quite sensitive to any change of the surrounding medium, like the substrate, the zero-backward scattering seems to be less sensitive and very stable under normal illumination. In this letter, the zero-backward scattering condition was investigated on a homogenous Cu2O spherical subwavelength particle, both theoretically and experimentally. In particular, the influence of the substrate and the impinging direction on the angular distribution of light scattering under this directional condition were studied. We observed that the zero-backward scattering condition was also sensitive to the presence of a substrate beneath when a non-normal illumination was considered. We believe that our finding is quite interesting from a practical point of view and for the real implementation of directional scattering in various applications like cloaking, light-emitting devices, photovoltaic devices, bio-sensing, and many more.

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Strong suppression of forward or backward Mie scattering by using spatial coherence

Cited by 8 publications

References 22 publications

Photo-Thermoelectric Conversion Using Black Silicon with Enhanced Light Trapping Performance far beyond the Band Edge Absorption

Photo-Thermoelectric Conversion Using Black Silicon with Enhanced Light Trapping Performance far beyond the Band Edge Absorption

Controllable optical resonances and unidirectional scattering by core-shell nanoparticles

Analysis of the Substrate Effect on the Zero-Backward Scattering Condition of a Cu2O Nanoparticle under Non-Normal Illumination

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