PROBLEM TO BE SOLVED: To enable more efficient separation of light with less optical filter elements.SOLUTION: An optical filter element according to an embodiment of the present invention comprises a pair of reflection surfaces disposed in parallel at a predetermined interval to constitute a Fabry-Perot resonator. At least one of the pair of the reflection surfaces is a wavelength selective reflection surface containing a dielectric multilayer film, which has a vacuum layer or a gas layer disposed between a pair of reflection films such that narrowband light having a center wavelength within an absorption band of a prescribed biological substance is allowed to selectively transmit and the center wavelength varies according to the incident angle.COPYRIGHT: (C)2015,JPO&INPIT【課題】少ない光学フィルタ素子数により高効率の分光を可能にする。【解決手段】本発明の実施形態に係る光学フィルタ素子は、所定の間隔をあけて平行に配置された、ファブリ・ペロー共振器を構成する一対の反射面を備え、一対の反射面の少なくとも一方が、誘電体多層膜を含む波長選択性の反射面であり、一対の反射膜の間に真空層又は気体層が配置されていて、所定の生体物質の吸収帯内に中心波長を有する狭帯域光を選択的に透過させ、入射角に応じて中心波長が変化するように構成されている。【選択図】図3
