CIRCULARLY POLARIZED LIGHT SEPARATION FILM, METHOD FOR PRODUCING CIRCULARLY POLARIZED LIGHT SEPARATION FILM, INFRARED SENSOR, AND SENSING SYSTEM AND SENSING METHOD UTILIZING LIGHT

摘要

The present invention provides: a circularly polarized light separation film which selectively allows transmission of right circularly polarized light or left circularly polarized light in at least a part of the near infrared wavelength range, and which contains a visible light blocking layer that reflects or absorbs light in at least a part of the visible wavelength range and a circularly polarized light separation layer that selectively allows transmission of right circularly polarized light or left circularly polarized light in at least a part of the near infrared wavelength range; a method for producing the circularly polarized light separation film; an infrared sensor which contains the circularly polarized light separation film; and a sensing system and a sensing method, each of which uses the circularly polarized light separation film or a combination of the circularly polarized light separation film and a film containing a visible light blocking layer. A sensing system and a sensing method according to the present invention have high sensitivity regardless of the surrounding environment and are reduced in erroneous detection.