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漫射信道波导
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 返回首頁 > 產品與技術 > 反射防止塗佈液

 
 

减反射膜(增透膜),减少或消除透镜、棱镜、平面镜等学表面的反射光,增加元件透光量,减少或消除系统杂散光。
减反射膜以光的波动性和干涉现象为基础。二个振幅,波长相同的光波叠加,光波的振幅增强;二个光波原由相同,波程相差,二个光波叠加,那么互相抵消。镜片表面镀上减反射膜
(AR-coating ),膜层前后表面产生的反射光互相干扰,抵消反射光,达到减反射效果。在单波长实现零反射 ,在较宽的光谱区达到好的增透效果,則采双层、三层及多层减反射膜。
应用在镜片及太阳能电池 - 通过制备减反射膜提高光伏组件功率瓦值。晶体硅光伏电池使用的减反射膜是氮化硅,可采等离子增强化学气相淀积,使氨气和硅烷离子化,沉积在硅片表面,有高的折射率,好的减反射效果。光伏电池采用二氧化硅和二氧化钛膜作减反射层。


The refractive index of a typical commercially available microlens film is approximately 1.6 in the visible spectrum of light. When light is incident from air to the lens surface, significant reflections can occur due to the large refractive index mismatch. An overcoat layer with a suitable refractive index and film thickness can be used to effectively suppress reflections thus increasing the amount of light received by the sensor. the reflectance for an air/overcoat/microlens layer as a function of overcoat thickness and refractive index. Although both the microlens and overcoat layers were assumed to be flat and fully transparent in the calculations, a good approximation of the reflectance as a function of film thickness, refractive index and incident wavelength can be made.

The film thickness as well as refractive index of the overcoat needs to be optimized to achieve minimum reflectance. The lowest reflectance for normally incident light is reached when the optical thickness of the film is exactly one quarter of the incident wavelength satisfying the condition for destructive interference. The highest reflectance, which is equal to having no overcoat, on the other hand is achieved when the film thickness is half of the incident wavelength in which case constructive interference occurs. The optimum refractive index and film thickness values for an anti-reflection coating on a microlens layer with refractive index of 1.60 were calculated to be 1.26 and 126 nm, respectively. The calculation was done at 633 nm wavelength.

The lowest reflectance for normally incident light is reached at 633 nm for which the anti-reflection coating was optimized to. Both longer and especially shorter wavelengths can however be seen to have increased reflectance. This is due to the fact that the quarter wavelength thickness rule cannot be satisfied for all wavelengths simultaneously leading to incomplete destructive interference due to phase changes between light reflected from the surface of the anti-reflection coating and the underlying film. The angle of incident light also affects the amount of reflected light because the distance light travels in the anti-reflection coating material changes which again leads to phase changes. Despite the above, the overcoat layer still manages to significantly reduce the reflectance across the visible spectrum.

The AR materials are a silica sol and the particle size is the same as one tenth of the visible light wavelength. These are necessary materials which enhance the anti-reflection property for CRT glass panels, as well as plastic lens & film.


波長:紫外,可見光,紅外線
 

Specification
AT50
MB215
Ave. Particle Size(nm)
60
40
Bulk Density
0.63
0.35
Color
Clear
Clear
B.E.T(m2/g)
10~15
10~15



防反射塗層的太陽能光熱接收管和光伏電池板
Generation of wet-chemical AR-coatings on plastic substrates by use of polymerizable nanoparticles



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