Optical device
AssigneeAsahi Kasei Microdevices Corporation
InventorKengo Sasayama
Life of this patent
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Abstract
An optical device comprises an optical filter having a substrate and a multilayer film having layers with different refractive indexes formed on at least one side of the substrate; and an infrared light emitting and receiving device having a first conductive-type semiconductor layer, an active layer, and a second conductive-type semiconductor layer. The multilayer film has alternatively stacked first second layers each having refractive indexes of 1.2 or more and 2.5 or less, and 3.2 or more and 4.2 or less, respectively, in a wavelength range of 2400 nm to 6000 nm. The optical filter includes a wavelength range having an average transmittance of 70% or more with a width of 50 nm or more in a wavelength range of 2400 nm to 6000 nm, and has a maximum transmittance of 5% or more in a wavelength range of 6000 nm to 8000 nm.
Claims16
An optical device comprising:
- an optical filter having a substrate and a multilayer film having a plurality of layers with different refractive indexes formed on at least one side of the substrate;
- and
- an infrared light emitting and receiving device having a semiconductor layer of a first conductive type, an active layer, and a semiconductor layer of a second conductive type;
- wherein
- the multilayer film has a structure in which a first layer and a second layer are alternately stacked, the first layer has a refractive index of 1.2 or more and 2.5 or less in a wavelength range of 2400 nm to 6000 nm, and the second layer has a refractive index of 3.2 or more and 4.2 or less in a wavelength range of 2400 nm to 6000 nm;
- and
- the optical filter includes a wavelength range having an average transmittance of 70% or more with a width of 50 nm or more in a wavelength range of 2400 nm to 6000 nm, and has a maximum transmittance of 5% or more in a wavelength range of 6000 nm to 8000 nm.
An optical device comprising:
- an optical filter having a substrate and a multilayer film having a plurality of layers with different refractive indexes formed on at least one side of the substrate;
- and
- an infrared light emitting and receiving device having a semiconductor layer of a first conductive type, an active layer, and a semiconductor layer of a second conductive type;
- wherein
- the multilayer film has a structure in which a first layer and a second layer are alternately stacked, the first layer contains at least one selected from the group consisting of SiO, SiO2, TiO2 and ZnS, and the second layer contains at least one selected from the group consisting of Si and Ge;
- and
- the optical filter includes a wavelength range having an average transmittance of 70% or more with a width of 50 nm or more in a wavelength range of 2400 nm to 6000 nm, and has a maximum transmittance of 5% or more in a wavelength range of 6000 nm to 8000 nm.
Dependencies are inferred from the claim text.