Angle-insensitive spectral filter

    公开(公告)号:US09880330B1

    公开(公告)日:2018-01-30

    申请号:US15257044

    申请日:2016-09-06

    CPC classification number: G02B5/201 G02B5/1885 G02B5/288 H01L27/146

    Abstract: In one embodiment, an optical element includes a first semi-transparent semi-reflective layer and a second semi-transparent semi-reflective layer. The optical element includes a first transparent material having a first refractive index and disposed between the first semi-transparent semi-reflective layer and the second semi-transparent semi-reflective layer. The optical element includes a second transparent material having a second refractive index, disposed between the first semi-transparent semi-reflective layer and the second semi-transparent semi-reflective layer, and surrounding the first transparent material in a plane parallel to the first semi-transparent semi-reflective layer and the second semi-transparent semi-reflective layer. The first refractive index is higher than the second refractive index.

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