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Six-spectral antireflection coating on zinc sulfide simultaneously effective for the visible, near-IR, and long wavelength IR regions
摘要： In recent years, multi-spectral optical system is steadily growing popularity due to miniaturization and multi-function of optical system. Antire?ection coatings is critical important in multi-spectral device working in the wavelength region of 0.5–10 μm since optics of high refractive index materials are used. A six-spectral antire?ection coating on multispectral zinc sul?de substrate, which is suitable for the wavelength range of 0.5–10 μm, has been designed, fabricated and characterized. The six-spectral antire?ection coating is composed of 29-layer alternative stacking high-index layer of zinc sul?de and low-index coating material of ytterbium ?uoride, which deposits by thermal evaporation. In order to overcome the stress problem in the coating, the maximum layer thickness is restricted about 0.6 μm. This coating conforms to environmental stability standards and shows 94% transmission at 0.532 μm, 97% transmission at 1.064 μm and over 98% transmission at 2.1 μm, 3.9 μm, 4.8 μm and 9.5 μm.
关键词： Ytterbium ?uoride,Zinc sul?de,Durability tests,Antire?ection coating
更新于2025-09-23 15:19:57
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Broadband Solar Energy Absorption in Plasmonic Thin-Film Amorphous Silicon Solar Cell
摘要： Improving the light absorption in thin-?lm solar cell is essential for enhancing e?ciency and reducing cost. Here, we propose an ultra-broadband amorphous silicon solar cell based on a periodic array of titanium ring-shaped metasurfaces, which achieves more than 90% absorptance in the visible range of the solar spectrum. The surface plasmon resonance supported by the nanoparticles together with the resonance induced by the metal–insulator–metal Fabry–Perot cavity leads to this broadband absorption. The impact of various materials of functional layers and the geometric structure of the nanoparticle on absorption performance is discussed in detail, and super broadband resonance is achieved after optimization. Moreover, the optimized solar cell is tested for di?erent solar incidence angles and it is found that the structure exhibits high absorption e?ciency even at large angles. Thus, the proposed solar cell design may be bene?cial for most of the photovoltaic applications.
关键词： nanoparticle,antire?ection coating,solar incidence angle,broadband absorption
更新于2025-09-16 10:30:52
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Improving detection efficiency of superconducting nanowire single-photon detector using multilayer antireflection coating
摘要： Optical cavity with backside optical coupling is one of the prevalent optical structures for superconducting nanowire single photon detector. A single layer anti-re?ection coating (ARC) on the backside of the substrate is often adopted to enhance the transmittance to the substrate. We here apply a multilayer ARC to further increase the transmittance from 94.5% to 99.5%. An NbTiN SNSPD made on such a substrate with cavity structure presents a system detection ef?ciency of 90.1% at a dark count rate (DCR) of 100 Hz, which is the best value reported for backside optical coupled SNSPD at 1550 nm. It shows a timing jitter of ～40.7 ps and the recovery time constant of ～22.9 ns.
关键词： superconducting nanowire single-photon detector,multilayer antire?ection coating,detection efficiency
更新于2025-09-10 09:29:36