PHOTODETECTOR
First Claim
1. A photodetector comprising:
- an optical element, having a structure including first regions and second regions periodically arranged with respect to the first regions along a plane perpendicular to a predetermined direction, for generating an electric field component in the predetermined direction when light is incident thereon along the predetermined direction; and
a semiconductor multilayer body having a quantum cascade structure, arranged on the other side opposite from one side in the predetermined direction with respect to the optical element, for producing a current according to the electric field component in the predetermined direction generated by the optical element;
wherein the quantum cascade structure includes an active region for exciting an electron and an injector region for transporting the electron; and
wherein the active region is formed on the outermost surface on the one side of the injector region in the quantum cascade structure.
1 Assignment
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Accused Products
Abstract
A photodetector 1A comprises an optical element 10, having a structure including first regions and second regions periodically arranged with respect to the first regions along a plane perpendicular to a predetermined direction, for generating an electric field component in the predetermined direction when light is incident thereon along the predetermined direction; and a semiconductor multilayer body 4 having a quantum cascade structure, arranged on the other side opposite from one side in the predetermined direction with respect to the optical element, for producing a current according to the electric field component in the predetermined direction generated by the optical element 10; while the quantum cascade structure includes an active region 4b for exciting an electron and an injector region 4c for transporting the electron, the active region 4b being formed on the outermost surface on the one side of the injector region 4c in the quantum cascade structure.
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Citations
11 Claims
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1. A photodetector comprising:
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an optical element, having a structure including first regions and second regions periodically arranged with respect to the first regions along a plane perpendicular to a predetermined direction, for generating an electric field component in the predetermined direction when light is incident thereon along the predetermined direction; and a semiconductor multilayer body having a quantum cascade structure, arranged on the other side opposite from one side in the predetermined direction with respect to the optical element, for producing a current according to the electric field component in the predetermined direction generated by the optical element; wherein the quantum cascade structure includes an active region for exciting an electron and an injector region for transporting the electron; and wherein the active region is formed on the outermost surface on the one side of the injector region in the quantum cascade structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification