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US 11,686,679 B2Granted
Optical waveguide and optical concentration measuring apparatus wherein evanescent wave interacts with gas or liquid through the protection film of the waveguide
AssigneeAsahi Kasei Microdevices Corporation
InventorsToshiro Sakamoto, Tatsushi Yagi
Life of this patent
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Abstract
An optical waveguide includes a core layer which extends along a longitudinal direction and through which light can propagate; and a protective film that is formed on at least a portion of a surface of the core layer and has a smaller refractive index than the core layer. At least a portion of the protective film is provided in a manner allowing contact with a gas or a liquid. In a cross-section of at least a portion perpendicular to a longitudinal direction of the core layer, the protective film is formed around the entire surface of the core layer.
Claims11
An optical waveguide comprising:
- a core layer which extends along a longitudinal direction and through which light can propagate;
- and
- a protective film that is formed on at least a portion of a surface of the core layer and has a smaller refractive index than the core layer;
- wherein the light propagating through the core layer is reflected at a boundary between the core layer and the protective film to produce an evanescent wave;
- wherein at least a portion of the protective film is provided in a manner allowing contact with a gas or a liquid so that the evanescent wave interacts with the gas or the liquid through the protective film;
- and
- wherein in a cross-section of at least a portion perpendicular to a longitudinal direction of the core layer, the protective film is formed around the entire surface of the core layer.
4 more elements
Dependencies are inferred from the claim text.