CN216434437U - Wavelength selection all-optical switch based on surface plasmon polaritons - Google Patents
Wavelength selection all-optical switch based on surface plasmon polaritons Download PDFInfo
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- CN216434437U CN216434437U CN202220096160.0U CN202220096160U CN216434437U CN 216434437 U CN216434437 U CN 216434437U CN 202220096160 U CN202220096160 U CN 202220096160U CN 216434437 U CN216434437 U CN 216434437U
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Abstract
The invention relates to a wavelength selection all-optical switch based on surface plasmon polariton, belonging to the technical field of micro-nano photoelectron; the wavelength selection all-optical switch consists of a substrate layer and a rectangular metal layer, wherein the rectangular metal layer is tightly attached to the upper side of the substrate layer, a first straight waveguide, a second straight waveguide, a third straight waveguide, a fourth straight waveguide and an equilateral triangle resonant cavity which are as high as the rectangular metal layer are etched on the rectangular metal layer, the directions of the second straight waveguide and the fourth straight waveguide are the same as the long side direction of the rectangular metal layer, and the included angles between the first straight waveguide and the third straight waveguide and the long side direction of the rectangular metal layer are both 60 degrees; a rectangular metal block which has the same height as the rectangular metal layer and the center of which is coincided 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 has the advantages of simple structure, selectable wavelength and high extinction ratio, and can be applied to large-scale integrated optical communication devices in the future.
Description
Technical Field
The invention discloses a wavelength selection all-optical switch based on surface plasmon polariton, and belongs to the technical field of micro-nano photoelectron.
Background
The surface plasmon is an electromagnetic evanescent wave which propagates along an interface between metal and a dielectric medium and exponentially attenuates in the vertical direction of the interface, and the electromagnetic wave has the performance of breaking through the traditional diffraction limit, electric field constraint and the like.
As a typical waveguide structure based on a surface plasmon filter, a metal-dielectric-metal structure has characteristics of high confinement of light and easy manufacturing, and thus, the metal-dielectric-metal structure based on surface plasmon is applied to various photonic elements such as sensors, mach-zehnder interferometers, filters, and the like.
In a high-speed optical communication system, an optical switch is used as a key node device to realize functions of optical cross connection, optical switching, optical add-drop multiplexing, network self-healing protection and the like. At present, with the development of highly integrated all-pass devices, the requirements of all-optical switches for electromagnetic interference resistance, high response speed and the like are more and more obvious, but most of the existing all-optical switches are used for switching single wavelength optical signals, the wavelength is not selectable, the structure is complex, the extinction ratio is low, the wavelength is selectable, and the multichannel optical switches with simple structures and high extinction ratios are particularly important.
Disclosure of Invention
In order to achieve the purpose, the invention discloses a wavelength selection all-optical switch based on surface plasmon polariton, which can realize wavelength selection by incidence in different straight waveguides, has a simple structure and high extinction ratio.
The purpose of the invention is realized as follows:
the wavelength selection all-optical switch based on surface plasmon comprises a substrate layer and a rectangular metal layer, wherein the rectangular metal layer is tightly attached to the upper side of the substrate layer, a first straight waveguide, a second straight waveguide, a third straight waveguide, a fourth straight waveguide and an equilateral triangle resonant cavity which are as high as the rectangular metal layer 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, and included angles between the first straight waveguide and the rectangular metal layer and the long side direction of the rectangular metal layer are both 60 degrees; and a rectangular metal block which has the same height as the rectangular metal layer and the center of which is coincided 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 polariton has the following size:
the size of the rectangular metal layer is 1160nm multiplied by 530nm multiplied by 75 nm;
the width of the first straight waveguide is 50nm, and the distance between the first straight waveguide and the equilateral triangle resonant cavity is d1＝18nm；
The width of the second straight waveguide is 50nm, and the distance between the second straight waveguide and the equilateral triangle resonant cavity is d2＝20nm～50nm；
The width of the third straight waveguide is 50nm, and the distance between the third straight waveguide and the equilateral triangle resonant cavity is d3＝18nm；
The width of the fourth straight waveguide is 50nm, and the distance between the fourth straight waveguide and the equilateral triangle resonant cavity is d4＝10nm～40nm；
The side length of the equilateral triangle resonant cavity is 484 nm;
the length h of the rectangular metal block is 200nm, and the width w of the rectangular metal block is 20 nm-50 nm.
Furthermore, the substrate layer is made of silicon dioxide materials, the rectangular metal layer and the rectangular metal block are made of silver materials, and the first straight waveguide, the second straight waveguide, the third straight waveguide, the fourth straight waveguide and the equilateral triangle resonant cavity are communicated with air.
Has the advantages that:
first, the wavelength selection all-optical switch based on surface plasmon only comprises three solid structures of a substrate layer, a rectangular metal layer and a rectangular metal block, and five etching structures of a first straight waveguide, a second straight waveguide, a third straight waveguide, a fourth straight waveguide and an equilateral triangle resonant cavity.
Secondly, the all-optical switch is selected based on the wavelength of the surface plasmon, and the optical signals with different wavelengths can be subjected to switch modulation by incidence in different straight waveguides, so that the all-optical switch has the technical advantage of wavelength selectivity compared with other all-optical switches.
Thirdly, the invention selects the all-optical switch based on the wavelength of the surface plasmon, the highest extinction ratio can reach 11.7dB, and compared with other all-optical switches, the invention has the technical advantage of high extinction ratio.
Fourthly, the wavelength selection all-optical switch based on the surface plasmon can be applied to large-scale integrated optical communication devices in the future due to the simple structure, the selectable wavelength and the high extinction ratio.
Drawings
Fig. 1 is a schematic structural diagram of a wavelength-selective all-optical switch based on surface plasmon polariton.
FIG. 2 shows the distance d between the second straight waveguide and the equilateral triangular cavity2Transmittance profile with change.
FIG. 3 shows the distance d between the fourth straight waveguide and the equilateral triangle resonator4Transmittance profile with change.
Fig. 4 is a graph of transmittance for a change in the width w of a rectangular metal block.
Fig. 5 is a graph of transmittance when optical signals are input from different straight waveguides.
In the figure: the waveguide structure comprises a substrate layer 1, a rectangular metal layer 2, a first straight waveguide 3, a second straight waveguide 4, a third straight waveguide 5, a fourth straight waveguide 6, an equilateral triangle resonant cavity 7 and a rectangular metal block 8.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Detailed description of the invention
In the wavelength selection all-optical switch based on surface plasmon in this specific embodiment, a schematic structural diagram is shown in fig. 1, and the all-optical switch is composed of a substrate layer 1 and a rectangular metal layer 2, the rectangular metal layer 2 is tightly attached to the substrate layer 1, a first straight waveguide 3, a second straight waveguide 4, a third straight waveguide 5, a fourth straight waveguide 6 and an equilateral triangular resonant cavity 7 which are as high as the rectangular metal layer 2 are etched on the rectangular metal layer 2, 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 included angles between the first straight waveguide 3 and the rectangular metal layer 2 and the included angles between the third straight waveguide 5 and the long side of the rectangular metal layer 2 are both 60 ° (both α and β in fig. 1 are 60 °); and a rectangular metal block 8 which has the same height as the rectangular metal layer 2 and the center of which is superposed with the inner center of the equilateral triangle resonant cavity 7 is also arranged in the equilateral triangle resonant cavity 7.
Detailed description of the invention
In this embodiment, the surface plasmon-based wavelength selective all-optical switch is further defined in the first embodiment:
the size of the rectangular metal layer 2 is 1160nm multiplied by 530nm multiplied by 75 nm;
the width of the first straight waveguide 3 is 50nm, and the distance between the first straight waveguide and the equilateral triangle resonant cavity 7 is d1＝18nm；
The width of the second straight waveguide 4 is 50nm, and the distance between the second straight waveguide and the equilateral triangle resonant cavity 7 is d2＝20nm～50nm；
The width of the third straight waveguide 5 is 50nm, and the distance between the third straight waveguide and the equilateral triangle resonant cavity 7 is d3＝18nm；
The width of the fourth straight waveguide 6 is 50nm, and the distance between the fourth straight waveguide and the equilateral triangular resonant cavity 7 is d4＝10nm～40nm；
The side length of the equilateral triangle resonant cavity 7 is 484 nm;
the rectangular metal block 8 has a length h of 200nm and a width w of 20 to 50 nm.
Detailed description of the invention
In this embodiment, the surface plasmon-based wavelength selection all-optical switch is further defined on the basis of the first embodiment or the second embodiment: the substrate layer 1 is made of silicon dioxide materials, the rectangular metal layer 2 and the rectangular metal block 8 are made of silver materials, and the first straight waveguide 3, the second straight waveguide 4, the third straight waveguide 5, the fourth straight waveguide 6 and the equilateral triangle resonant cavity 7 are communicated with air.
Detailed description of the invention
In the wavelength selection all-optical switch based on surface plasmon polariton in this embodiment, the distances d from the second straight waveguide 4 to the equilateral triangular resonant cavity 7 are respectively2Carrying out simulation test when the distance d is reached2The transmittance curve varies from 50nm to 20nm as shown in FIG. 2, and it can be seen that the range of 400nm to 700nm varies with d2The transmittance of the two formants increases while a slight red shift occurs, and the waveform remains substantially unchanged.
Detailed description of the invention
In the wavelength selection all-optical switch based on surface plasmon polariton in this embodiment, the distances d from the fourth straight waveguide 6 to the equilateral triangular resonant cavity 7 are respectively4Carrying out simulation test when the distance d is reached4The transmittance curve varies from 40nm to 10nm as shown in FIG. 3, and it can be seen that the range of 400nm to 700nm varies with d4The transmittance of the two formants increases while a slight red shift occurs, and the waveform remains substantially unchanged.
Detailed description of the invention
In the full-optical switch based on the wavelength selection of the surface plasmon in the embodiment, the width w of the rectangular metal block 8 is subjected to simulation test, when the width w is changed from 50nm to 20nm, the transmittance curve is shown in fig. 4, and it can be seen that in the range of 400nm to 700nm, as w is reduced, the transmittance of the formant 1 is increased, the transmittance of the formant 2 is basically unchanged, and simultaneously, a blue shift occurs, and the waveform is basically unchanged.
Detailed description of the invention
In the wavelength selection all-optical switch based on surface plasmon in this embodiment, optical signals are input to the first straight waveguide 3, the second straight waveguide 4, and the third straight waveguide 5, and the combination is as follows:
the second straight waveguides 4 are input in combination and independently;
combining two, and simultaneously inputting the second straight waveguide 4 and the first straight waveguide 3;
combining three, and simultaneously inputting the second straight waveguide 4 and the third straight waveguide 5;
combining four, and simultaneously inputting the second straight waveguide 4, the first straight waveguide 3 and the third straight waveguide 5;
the change of the transmittance curve is shown in fig. 5, and it can be seen that, in the range of 400nm to 550nm, the fourth combination can make the extinction ratio of the first combination to the formant 1 reach 4.5dB, and the second combination and the third combination can make the extinction ratio of the first combination to the formant 2 reach 11.7dB, which verifies that compared with other all-optical switches, the all-optical switch has the technical advantage of high extinction ratio.
Claims (3)
1. The wavelength selection all-optical switch based on surface plasmon is characterized by comprising a substrate layer (1) and a rectangular metal layer (2), wherein the rectangular metal layer (2) is tightly attached to the upper side of the substrate layer (1), a first straight waveguide (3), a second straight waveguide (4), a third straight waveguide (5), a fourth straight waveguide (6) and an equilateral triangle resonant cavity (7) which are as high as the rectangular metal layer (2) are etched on the rectangular metal layer (2), wherein the second straight waveguide (4) and the fourth straight waveguide (6) are the same as the long side direction of the rectangular metal layer (2), and the included angles between the first straight waveguide (3) and the rectangular metal layer (2) and the included angles between the third straight waveguide (5) and the long side direction of the rectangular metal layer (2) are both 60 degrees; a rectangular metal block (8) which has the same height with the rectangular metal layer (2) and the center of which is superposed with the inner center of the equilateral triangle resonant cavity (7) is also arranged in the equilateral triangle resonant cavity (7).
2. The surface plasmon based wavelength selective all-optical switch of claim 1, wherein the dimensions are defined as follows:
the size of the rectangular metal layer (2) is 1160nm multiplied by 530nm multiplied by 75 nm;
the width of the first straight waveguide (3) is 50nm, and the distance between the first straight waveguide and the equilateral triangle resonant cavity (7) is d1＝18nm；
The width of the second straight waveguide (4) is 50nm, and the distance between the second straight waveguide and the equilateral triangle resonant cavity (7) is d2＝20nm～50nm；
The width of the third straight waveguide (5) is 50nm, and the distance between the third straight waveguide and the equilateral triangle resonant cavity (7) is d3＝18nm；
The width of the fourth straight waveguide (6) is 50nm, and the distance between the fourth straight waveguide and the equilateral triangle resonant cavity (7) is d4＝10nm～40nm；
The side length of the equilateral triangle resonant cavity (7) is 484 nm;
the rectangular metal block (8) has a length h of 200nm and a width w of 20-50 nm.
3. Surface plasmon based wavelength selective all-optical switch according to claim 1 or 2, characterized in that the first (3), second (4), third (5), fourth (6) and equilateral triangular cavities (7) are in communication with air.
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