Ultra-broadband reflector using double-layer subwavelength gratings

Zhang, Jinlong; Shi, Sheng‐Cai; Jiao, Hongfei; Ji, Xiaochuan; Wang, Zhanshan; Cheng, Xinbin

doi:10.1364/prj.382941

Cited by 14 publications

(6 citation statements)

References 21 publications

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“…4,5 In recent years, a new way to realize high reflectivity with nanostructures has been developed. [6][7][8][9][10][11][12] When the characteristic size of the nanostructure is close to the wavelength of incident light, the interaction between the light and nanostructures is a resonant response, which causes constructive or destructive interference. When the interference decreases, the reflectivity decreases, and when the interference increases, the reflectivity increases.…”

Section: Introductionmentioning

confidence: 99%

Mimicking the structure of Morpho butterfly wing surface: a highly reflective nanostructure assembled by nanospheres

Yao-hui

Jiang

2022

J. Nanophoton.

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Inspired by the surface structure of Morpho butterfly wings, we theoretically propose a biomimetic nanosphere structure with high optical reflectivity. By adjusting the geometric parameters and material parameters of the nanostructure, we obtain reflectivity >99% in a certain band; the high-reflection bandwidth depends on the period width, filling factor, and number of nanospheres. Its high-reflectivity bandwidth is less dependent on the incidental light angle compared with general single-layer or multilayer coatings for reflection enhancement. Unlike the biomimetic structures that are completely the same as the Morpho butterfly surface, this simplified structure can be assembled in ways other than photolithography and electron-beam lithography. We also analyzed several deviations of the structure, and the results show that our design allowed these deviations, which is helpful to achieving the effect of the structure in the preparation process. At the same time, the equivalent medium theory was used to analyze the nanostructure. The nanosphere structure has excellent potential applications in optical devices that require high reflectivity, such as laser resonant cavity and optical filters.

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Section: Introductionmentioning

confidence: 99%

Mimicking the structure of Morpho butterfly wing surface: a highly reflective nanostructure assembled by nanospheres

Yao-hui

Jiang

2022

J. Nanophoton.

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“…Resonant waveguide gratings (RWGs) based on guided-mode resonance have been widely studied owing to their simple structure and excellent performance [1]. They are utilized in many functional devices such as optical filters [2], optical sensors [3], absorbers [4], and ultra-broadband reflectors [5]. A single-layered RWG is applied as an optical filter because of the resonant coupling of an incident light wave to a leaky waveguide mode [6]; however, it was found that the Lorentzian-type spectral response in a single RWG hindered its further application in optical communications.…”

Section: Introductionmentioning

confidence: 99%

Tunable Flat-Top Filtering Response in Cascaded Resonant Waveguide Gratings

Liu

et al. 2021

IEEE Photonics J.

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The applicability of resonant waveguide grating (RWG)-based structures as filters to control the spectral response in an optical communication system is investigated. A new physical model for the structure is established on the basis of the Fabry-Pérot (FP) etalon model and coupled leaky mode theory (CLMT). It is found that the flat-top spectral response of the filter is achieved by the combined effect of the guided-mode resonance of an RWG and its Fabry-Pérot resonance (FPR). The bandwidth-tunable spectral response of the filter can be varied according to the change in the eigenvalues of the RWG by changing the structural parameters such as strip width of the grating and incident angle. The flat-top and bandwidth-tunable RWG-based resonant filter is a promising application for high-performance optical communication systems.

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“…Zhang et al 14 fabricated an ultra-broadband reflector with reflectance exceeding 97% over a wavelength range of 955 nm in the near-infrared region, by the structure of a double-layer subwavelength grating including a middle planarization layer. Compared to the classical single grating GMR sensor, Moghaddas et al 15 realized a biosensor with a roughly two-fold surface sensitivity, equal bulk sensitivity, and extremely narrow resonance linewidth by cross-stacking structure with equal available area.…”

Section: Introductionmentioning

confidence: 99%

Dual‐channel glucose concentration sensor based on coupled cross‐stacked gratings

Wang

Gao

et al. 2021

Micro & Optical Tech Letters

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A dual-channel glucose concentration sensor based on coupled cross-stacked gratings is proposed. When the concentration of glucose solution is varied from 30 to 60 g/100 ml, the maximum values of the bulk sensitivity for peaks at longer and shorter resonance wavelength indicate approximately 615.57 and 262.94 nm/ RIU, respectively. Therefore, the sensitivity of channel at longer wavelength is increased by 234.42% compared with that of the shorter wavelength. Advantageously, the dual-channel sensor with different sensitivities can reduce measurement errors and noise effectively such as background noise and the fluctuation of the light source.

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Ultra-broadband reflector using double-layer subwavelength gratings

Cited by 14 publications

References 21 publications

Mimicking the structure of Morpho butterfly wing surface: a highly reflective nanostructure assembled by nanospheres

Mimicking the structure of Morpho butterfly wing surface: a highly reflective nanostructure assembled by nanospheres

Tunable Flat-Top Filtering Response in Cascaded Resonant Waveguide Gratings

Dual‐channel glucose concentration sensor based on coupled cross‐stacked gratings

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