Broadband Anti-Reflection Coatings Fabricated by Precise Time-Controlled and Oblique-Angle Deposition Methods

Guo, Xiaonong; Quan, Xiangqian; Li, Zizheng; Li, Qiang; Zhang, Binzhi; Zhang, Xin; Song, Changhui

doi:10.3390/coatings11050492

Cited by 9 publications

(2 citation statements)

References 35 publications

(35 reference statements)

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“…The filter demonstrates good stability and reproducibility, meeting the requirements for spectral design and facilitating easier and more reliable production. Sensitivity analysis is an important indicator for evaluating the accuracy and reliability of film preparation [31]. Using Essential Macleod software, tolerance simulations were performed with a random error of 3‰ 20 times.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Jiang,

Fan,

et al. 2023

Coatings

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In order to reduce the noise interference of smart wearable devices, spectral filtering technology is used to suppress noise. This technology prevents interference signals from entering the detector from the source, thereby achieving high−precision noise reduction processing. According to the system requirements, a multi−bandpass filter with a wavelength range of 400~1000 nm was designed and prepared on a BK7 substrate. Ta2O5 and SiO2 were selected as the high− and low−refractive−index materials, respectively. By analyzing the −Fabry–Perot narrowband theory, the bandwidth matching coefficient was computed, and the interference order was calculated using the interval of the transmission peak wavelengths. Multiple F−P coating systems were connected through the matching layer to adjust the position of the transmission peak and broaden the bandwidth range. The design was optimized using Macloed film system design software, resulting in the design of a wide half−wave and cutoff multi−bandpass filter. The appropriate preparation process was chosen based on changes in refractive index, surface roughness, and the temperature gradient of the materials. The filter was then produced using Leybold SYRUSpro1110. Sensitivity, filter roughness, and the weak absorption of the film system were tested, and the results met the system requirements.

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Section: Sensitivity Analysismentioning

confidence: 99%

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Jiang,

Fan,

et al. 2023

Coatings

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“…Achieving broadband perfect absorption through multilayer antireflection coatings requires precise control of the complex process involving multiple depositions. 7,23 In In this work, we propose a dispersion compensation strategy to achieve broadband perfect absorption with a single-layer coated semiconductor substrate. Dispersion compensation strategies have been adopted to achieve broadband responses in metamaterial designs.…”

Section: Introductionmentioning

confidence: 99%

Terahertz broadband near-perfect absorber with a single-layer coating on doped semiconductor

2023

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We demonstrate that a single-layer coating on a doped GaAs or Si substrate enables broadband antireflection and, hence, broadband perfect absorption in the terahertz frequency range. This broadband behavior can be generally expected when the substrate material has a Drude-type dispersion. Our mathematical analyses show that the reflection from Drude-type material may have an anomalously dispersive phase shift. The anomalous dispersion of the reflection phase is used to compensate for the normal dispersion of the accumulation phase in the single-layer coating film. Consequently, the antireflection conditions are satisfied in a wide frequency range, and broadband antireflection is achieved. Thus, broadband perfect absorption is realized with only a single-layer coating film on the substrate. Our method provides a simple and efficient approach to achieving broadband perfect absorption, which is critical in many applications such as radar stealth techniques and solar cells.

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Design of Horizontally Stacked AlN and Dielectric Cores Transverse Quasi‐Phase‐Matched Channel Waveguide for Squeezed Light Generation

Honda,

Noro,

Uemukai

et al. 2024

Physica Status Solidi (a)

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AlN is a promising candidate for photonic integrated circuits. In this study, horizontally stacked transverse quasi‐phase‐matched (QPM) waveguides with an AlN center core and Si3N4, Ta2O5, and TiO2 side cores were designed to generate squeezed light at 920 nm. The squeezing level was calculated by considering the propagation loss at the wavelengths of the squeezed light and pump light. Using TiO2 for the side cores enhanced the electric field amplitude of the pump light in the AlN center core, and a high nonlinear coupling coefficient was obtained. Owing to the small propagation loss of the AlN waveguide on sapphire and high nonlinear coupling coefficient of the transverse QPM with TiO2 side cores, a squeezing level of over 8.1 dB was expected with a 1 cm long waveguide and pump power of 70 mW.

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Broadband Anti-Reflection Coatings Fabricated by Precise Time-Controlled and Oblique-Angle Deposition Methods

Cited by 9 publications

References 35 publications

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Terahertz broadband near-perfect absorber with a single-layer coating on doped semiconductor

Design of Horizontally Stacked AlN and Dielectric Cores Transverse Quasi‐Phase‐Matched Channel Waveguide for Squeezed Light Generation

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