Light emitting element, image sensor and light receiving element with linearly varying waveguide index
AssigneesRicoh Company, Ltd., Ricoh Research Institute of General Electronics Co., Ltd.
InventorIkue Kawashima
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Abstract
An optical device includes a substrate, an optical waveguide provided on a surface of the substrate, and an electroluminescence element including a first electrode layer, a first insulator layer, a light emitting layer for emitting light, a second insulator layer and a second electrode layer which are successively stacked. The light emitted from the light emitting layer is emitted from an end surface of the optical waveguide. The optical waveguide has a refractive index which increases from an outer periphery to a center portion of a cross section which is approximately parallel to the end surface, and the electroluminescence element is provided within the optical waveguide.
Claims53
An optical device comprising:
- a substrate;
- a first optical waveguide provided on a surface of said substrate;
- and
- an electroluminescence element including a first electrode layer, a first insulator layer, a light emitting layer for emitting light, a second insulator layer and a second electrode layer which are successively stacked, said light emitted from said light emitting layer being emitted from a first end surface of said first optical waveguide,
- said first optical waveguide having a refractive index which increases from an outer periphery to a center portion of a cross section which is approximately parallel to said first end surface,
- said electroluminescence element being provided within said first optical waveguide.
An optical device comprising:
- an optical waveguide having an end surface for receiving light;
- and
- a light receiving element coupled to said optical waveguide for receiving the light from the end surface of said optical waveguide via said optical waveguide,
- said optical waveguide having a refractive index which increases from an outer periphery to a center portion of a cross section which is approximately parallel to said end surface of said optical waveguide;
- wherein the refractive index of said optical waveguide increases continuously from the outer periphery to the center portion of the cross section.
Dependencies are inferred from the claim text.