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Wavelength selection all-optical switch based on surface plasmon polaritons
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A technology of surface plasmon and wavelength selection, applied in the field of micro-nano optoelectronics, can solve the problems of non-selectable wavelength, complex structure, low extinction ratio, etc., and achieve the effect of selectable wavelength and simple structure
Pending Publication Date: 2022-04-15
HEILONGJIANG UNIV
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At present, with the development of highly integrated all-off devices, the demand for anti-electromagnetic interference and fast response speed of all-optical switches is becoming more and more obvious. However, most of the existing all-optical switches are used to switch single-wavelength optical signals, and the wavelength cannot be Selection, complex structure and low extinction ratio, it is particularly important to realize multi-channel optical switches with selectable wavelength, simple structure and high extinction ratio
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specific Embodiment approach 1
[0029] The wavelength-selective all-optical switch based on surface plasmons under this specific embodiment, the structural diagram is as follows figure 1 As shown, it is composed of a base layer 1 and a rectangular metal layer 2. The rectangular metal layer 2 is closely attached to the top of the base layer 1. On the rectangular metal layer 2, a first straight waveguide 3 with the same height as the rectangular metal layer 2 is etched. The second straight waveguide 4, the third straight waveguide 5, the fourth straight waveguide 6 and the equilateral triangular resonant cavity 7, wherein the second straight waveguide 4 and the fourth straight waveguide 6 are in the same direction as the long side of the rectangular metal layer 2, and the first The included angles between the straight waveguide 3 and the third straight waveguide 5 and the long side direction of the rectangular metal layer 2 are both 60° ( figure 1 α and β are both 60°); in the equilateral triangular resonant c...
specific Embodiment approach 2
[0030] The surface plasmon-based wavelength-selective all-optical switch under this specific embodiment is further defined on the basis of specific embodiment 1:
[0031] The size of the rectangular metal layer 2 is 1160nm×530nm×75nm;
[0032] The width of the first straight waveguide 3 is 50nm, and the distance from the equilateral triangular resonant cavity 7 is d 1 =18nm;
[0033] The width of the second straight waveguide 4 is 50nm, and the distance from the equilateral triangular resonant cavity 7 is d 2 =20nm~50nm;
[0034] The width of the third straight waveguide 5 is 50nm, and the distance from the equilateral triangular resonant cavity 7 is d 3 =18nm;
[0035] The width of the fourth straight waveguide 6 is 50nm, and the distance from the equilateral triangular resonant cavity 7 is d 4 = 10nm ~ 40nm;
[0036] The side length of the equilateral triangular resonator 7 is 484nm;
[0037] The rectangular metal block 8 has a length h=200nm and a width w=20nm˜50nm. ...
specific Embodiment approach 3
[0038] The wavelength-selective all-optical switch based on surface plasmons in this specific embodiment is further defined on the basis of specific embodiment 1 or specific embodiment 2: the base layer 1 is made of silicon dioxide material, and the rectangular The metal layer 2 and the rectangular metal block 8 are made of silver material, and the first straight waveguide 3 , the second straight waveguide 4 , the third straight waveguide 5 , the fourth straight waveguide 6 and the equilateral triangular resonant cavity 7 communicate with the air.
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Abstract
The invention discloses a wavelength selection all-optical switch based on surface plasmon polaritons, and belongs to the technical field of micro-nano photoelectrons. The wavelength selection all-optical switch is composed of a substrate layer and a rectangular metal layer, the rectangular metal layer is tightly attached to the upper portion of the substrate layer, and a first straight waveguide, a second straight waveguide, a third straight waveguide, a fourth straight waveguide and an equilateral triangle resonant cavity which are equal to the rectangular metal layer in height are etched on the rectangular metal layer, the second straight waveguide and the fourth straight waveguide are the same as the long side direction of the rectangular metal layer; included angles between the first straight waveguide and the long side direction of the rectangular metal layer and between the third straight waveguide and the long side direction of the rectangular metal layer are 60 degrees; a rectangular metal block which is as high as the rectangular metal layer and of which the center coincides with the inner center of the equilateral triangle resonant cavity is also arranged in the equilateral triangle resonant cavity; the wavelength selection all-optical switch based on the surface plasmon polaritons is simple in structure, has the technical advantages of selectable wavelength and high extinction ratio, and can be applied to large-scale integrated optical communication devices in the future.
Description
technical field [0001] The invention relates to a wavelength-selective all-optical switch based on surface plasmons, which belongs to the technical field of micro-nano optoelectronics. Background technique [0002] Surface plasmons are electromagnetic evanescent waves that propagate along the interface between metal and dielectric and decay exponentially in the direction perpendicular to the interface. This electromagnetic wave has the properties of breaking through the traditional diffraction limit and electric field constraints. [0003] As a typical waveguide structure based on surface plasmon filters, the metal-dielectric-metal structure has the characteristics of high light confinement and easy fabrication. Therefore, the metal-dielectric-metal structure based on surface plasmons has been applied in different In photonic components such as sensors, Mach-Zehnder interferometers, filters, etc. [0004] In high-speed optical communication systems, optical switches are use...
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