High-contrast photonic crystal “and” logic gate
AssigneeShenzhen University
InventorsZhengbiao Ouyang, Quanqiang Yu
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Abstract
The present invention discloses a high-contrast photonic crystal AND logic gate, comprising a five-port two-dimensional photonic crystal, a nonlinear cavity unit and a Y-shape AND logic gate unit; and it includes a reference-light input port, two signal-input ports, a system signal-output port and an idle port; the nonlinear cavity unit is coupled with the Y-shape AND logic gate unit. The structure of the present invention, which is compact in structure and ease of integration with other optical logic elements, not only can realize the functions of the high-contrast photonic and logic gate, but also has high contrast of high and low logic output; and is widely applicable to optical communication bands.
Claims14
A high-contrast photonic crystal (PhC) AND logic gate, wherein said high-contrast PhC AND logic gate is a structure of five-port two-dimensional (2D) PhC, comprising:
- a reference-light input port, two signal-input ports, a system signal-output port and an idle port;
- and further comprising:
- a nonlinear cavity unit and a Y-shape AND logic gate unit, and said nonlinear cavity unit is coupled with said Y-shape AND logic gate unit;
- and
- the nonlinear cavity unit comprising one or more rectangular high-refractive-index linear-dielectric pillars to form the 2D PhC cross intersected waveguide four-port network;
- a left end of the four-port network is a reference-light input port, a lower end of the four-port network is an intermediate signal-input port, an upper end of the four-port network is a system signal-output port, and a right end of the four-port network is an idle port;
- a square non-linear dielectric pillar is arranged in a middle of a cross-waveguide, a cross section of the square non-linear dielectric pillar is square;
- twelve rectangular high-refractive-index linear-dielectric pillars and one square non-linear dielectric pillar are arranged in a center of the 2D PhC cross-waveguide nonlinear cavity in a form of a quasi-1D PhC along longitudinal direction in vertical waveguide and transverse directions in horizontal waveguide.
A high-contrast photonic crystal (PhC) AND logic gate, wherein the high-contrast PhC AND logic gate is a structure five-port two-dimensional (2D) PhC, comprising:
- a reference-light input port, two signal-input ports, a system signal-output port and an idle port;
- and further comprising:
- a nonlinear cavity unit and a Y-shape AND logic gate unit, and the nonlinear cavity unit is coupled with the Y-shape AND logic gate unit;
- and
- the Y-shape AND logic gate unit is of a three-port waveguide network PhC structure, a lower ends of the three-port waveguide network are respectively the two signal-input ports, and an upper end of the three-port waveguide network is an immediate signal-output port;
- a nonlinear-dielectric pillar is arranged at an intersection of the three-port waveguide network, and the nonlinear-dielectric pillar is circular.
Dependencies are inferred from the claim text.