Optical filter including plates for filtering light and optical measuring device employing optical filter

    公开(公告)号:US10379275B2

    公开(公告)日:2019-08-13

    申请号:US16235627

    申请日:2018-12-28

    Abstract: An optical filter includes pixels, each including: a first reflective plate configured to receive light and having first holes; and a second reflective plate facing the first reflective plate, separated from the first reflective plate by a gap, and having second holes corresponding to the first holes in shape and orientation. The second reflective plate is configured to transmit the light of a wavelength or the light of a range of wavelengths transmitted through the first reflective plate and incident on the second reflective plate, according to a spacing between adjacent holes of the first holes or a spacing between adjacent holes of the second holes. At least one pixel has the spacing between adjacent holes of the first holes different from that of at least one another pixel, or has the spacing between adjacent holes of the second holes different from that of the at least one another pixel.

    Optical filter and spectrometer including the same

    公开(公告)号:US11914181B2

    公开(公告)日:2024-02-27

    申请号:US17132200

    申请日:2020-12-23

    CPC classification number: G02B5/288 G01J3/28 G02B5/201 G02B5/28

    Abstract: Provided are an optical filter and a spectrometer including the optical filter. The optical filter includes at least one first filter element having a first center wavelength of a first wavelength band, and at least one second filter element arranged on a same plane as the at least one first filter element, the at least one second filter element having a second center wavelength of a second wavelength band. The at least one first filter element includes a first bandpass filter including a plurality of first Bragg reflective layers and at least one first cavity provided between the plurality of first Bragg reflective layers, and a first multi-layer provided on the first bandpass filter, the first multi-layer having a center wavelength different than the first center wavelength of the first Bragg reflective layers in order to block light of a wavelength band other than the first wavelength band.

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