CN116774352A - Biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity - Google Patents
Biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity Download PDFInfo
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Abstract
The application discloses a biosensor based on a one-dimensional topological photonic crystal coupling micro-ring cavity, which comprises: the first straight waveguide, the micro-ring resonant cavity and the second straight waveguide are sequentially connected; coupling points are formed between the first straight waveguide and the micro-ring resonant cavity in a coupling mode; a one-dimensional topological photonic crystal group is arranged on the first straight waveguide; the one-dimensional topological photonic crystal group is horizontally distributed on the first straight waveguide. The application is realized by splicing two kinds of photonic crystals with different topological properties, and the topological resonance mode protected by topology has the characteristics of high stability, full width at half maximum, strong defect immunity and the like, and is more beneficial to development and design of optical devices.
Description
Technical Field
The application relates to the technical field of micro-ring cavity biosensors, in particular to a biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity.
Background
A biosensor is a device for detecting and quantifying biomolecules. They are generally composed of biological elements, sensor elements and transducers. Depending on the bio-element and application scenario in which it is used, the bio-sensor may be classified into many types such as an optical sensor, an electrochemical sensor, a thermal sensor, a pressure sensor, a bio-crystal sensor, a microfluidic bio-sensor, and the like. The advantages of high sensitivity, high selectivity, real-time monitoring and the like lead the sensors to have wide prospects in the fields of medical treatment, environmental monitoring, food safety, agriculture, life science research, industry and the like.
The SOI optical biochemical sensor is a research hot spot in the field, and most of the existing SOI optical biochemical sensors adopt the evanescent wave detection principle. The principle is based on the fact that the refractive index of the waveguide changes with the change of the refractive index or concentration of the surrounding medium, which results in a change of the effective refractive index of the waveguide and thus in a shift of the spectrum. The photodetector can detect the shift of the spectrum, so that the information such as the concentration or the refractive index of the detected substance can be obtained. Specifically, the optical waveguide structure in the SOI optical biochemical sensor can adopt a micro-ring cavity, a micro-disk cavity, a microsphere cavity, a photonic crystal microcavity and other structures. The sensing method is divided into two types, one is sensing based on the movement of the resonant wavelength, that is, sensing information such as the concentration or refractive index of the external substance by detecting the movement of the resonant wavelength. The other is based on the sensing of the intensity change, i.e. by detecting the intensity change at a fixed wavelength position to obtain information such as the concentration or refractive index of the foreign substance. But the resonance line type generated by the general SOI optical biochemical sensor structure is a symmetrical line type (i.e. lorentz line type),
patent CN107703101a discloses a biosensor based on a one-dimensional photonic crystal coupling micro-ring cavity, which utilizes a coupling micro-ring cavity of a one-dimensional photonic defect cavity, and compared with a symmetric line type (lorentz line type) generated by a traditional micro-ring resonant cavity, an asymmetric line type is more advantageous in the sensing field. However, this solution requires high manufacturing process, and process errors can cause significant degradation of the sensor performance.
Disclosure of Invention
According to the application, two crystal structures with different winding numbers are spliced together, and topology zero mode generation is excited, so that the micro-ring photon biosensor has good robustness, and the topology resonance peak has a higher quality factor.
In order to achieve the above object, the present application provides a biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity, comprising: the first straight waveguide, the micro-ring resonant cavity and the second straight waveguide are sequentially connected;
coupling points are formed between the first straight waveguide and the micro-ring resonant cavity in a coupling mode;
a one-dimensional topological photonic crystal group is arranged on the first straight waveguide; the one-dimensional topological photonic crystal group is horizontally distributed on the first straight waveguide.
Preferably, the first and second straight waveguides have a length of 15 μm to 30 μm, a width of 0.5 μm to 1 μm, and a thickness of 0.2 μm to 0.4 μm; the first straight waveguide and the second straight waveguide are made of SOI silicon-based optical waveguide materials; the micro-ring resonator has a width of 0.5 μm to 1 μm and a radius of 5 μm to 10 μm.
Preferably, the one-dimensional topological photonic crystal group comprises: a first photonic crystal structure and a second photonic crystal structure; the first photonic crystal structure and the second photonic crystal structure are formed by interface splicing to form a surface state for realizing strong interaction between light and a substance.
Preferably, the first photonic crystal structure and the second photonic crystal structure are symmetrically distributed on the first straight waveguide with the splicing part as an axis.
Preferably, the first photonic crystal structure includes: circular holes which are arranged periodically; the period is set to be 12-18, each period comprises two round holes, and the arrangement mode is as follows: large round holes and small round holes.
Preferably, the second photonic crystal structure includes: circular holes which are arranged periodically; the period is set to be 12-18, each period comprises two round holes, and the arrangement mode is as follows: small round holes, large round holes.
Preferably, the large round hole in the first photonic crystal structure is identical to the large round hole in the second photonic crystal structure; the small round holes in the first photonic crystal structure are completely the same as the small round holes in the second photonic crystal structure; the first photonic crystal structure and the second photonic crystal structure have only round hole arrangement differences.
Preferably, the radius of the large round hole is 0.1 μm to 0.2 μm; the radius of the small round hole is 0.05 μm to 0.1 μm; the center distance between the large circular hole and the small circular hole is 0.4 μm to 0.6 μm.
Compared with the prior art, the application has the following beneficial effects:
the application is realized by splicing two kinds of photonic crystals with different topological properties, and the topological resonance mode protected by topology has the characteristics of high stability, full width at half maximum, strong defect immunity and the like, and is more beneficial to development and design of optical devices.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a one-dimensional topological photonic crystal group structure according to an embodiment of the present application;
fig. 3 is a schematic diagram of a general photonic crystal structure according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, a system structure diagram of the present embodiment includes: the first straight waveguide, the micro-ring resonant cavity and the second straight waveguide are sequentially connected; coupling points are formed between the first straight waveguide and the micro-ring resonant cavity in a coupling mode; a one-dimensional topological photonic crystal group is arranged on the first straight waveguide; the one-dimensional topological photonic crystal group is horizontally distributed on the first straight waveguide.
In this embodiment, the two straight waveguides are made of SOI silicon-based optical waveguide material, and have a length of 15 μm to 30 μm, a waveguide width of 0.5 μm to 1 μm, and a thickness of 0.2 μm to 0.4 μm. In addition, the micro-ring cavity has a width of 0.5 μm to 1 μm and a radius of 5 μm to 10 μm.
The first straight waveguide is provided with a one-dimensional topological photonic crystal group, and the one-dimensional topological photonic crystal group is used for splicing two crystal structures with different winding numbers together, so that a topological zero mode is excited, and the one-dimensional topological photonic crystal group is different from a traditional photonic crystal in that a resonance mode is realized by introducing point defects. The method can monitor the external changes such as refractive index and the like through the movement of wavelength.
In addition, after some defect errors are added, the resonance peak is found to have no change in quality of the resonance peak due to deformation of the defect, the influence caused by processing defect errors can be resisted, meanwhile, when the external environment changes, the change of the wavelength is detected, the wavelength movement is found to have a good linear relationship, and meanwhile, the topological resonance peak has a higher quality factor. The structure exhibits good sensing linearity and robustness to process design errors.
As shown in fig. 2, the one-dimensional topological photonic crystal group includes a first photonic crystal structure (PC 1) and a second photonic crystal structure (PC 2), where the PC1 and the PC2 are formed by interface splicing to form a surface state for realizing strong interaction between light and a substance; and on the first straight waveguide, the splicing parts are symmetrically distributed by taking the splicing parts as axes. Wherein, PC1 includes the big round hole of periodic arrangement, and the cycle sets up to 12-18, and every cycle contains two round holes, arranges according to from left to right, and big round hole is arranged to little round hole's mode. The PC2 comprises circular holes with the sizes which are arranged periodically, wherein the period is set to be 12-18, each period comprises two circular holes, and the circular holes are arranged in a mode of one small circular hole and one large circular hole from left to right.
It should be noted that the large round hole and the small round hole in the PC1 and the PC2 are identical; there is only a round hole arrangement difference between them. The radius of the large round hole is 0.1 μm to 0.2 μm, the radius of the small round hole is 0.05 μm to 0.1 μm, and the center distance between the two round holes is 0.4 μm to 0.6 μm.
Example two
In the following, in connection with the present embodiment, it will be described in detail how the present application has an advance over the prior art.
As shown in fig. 3, a general photonic crystal forms a photonic band gap by setting a defect, and when the sizes of circular holes in which the defect is set are equal, degeneracy occurs in energy bands. In the topological photonic crystal group of the embodiment, when the sizes of the round holes are different, the ratio of the low refractive index medium in the S substrate is different, and when light propagates in the waveguide, the situation of catadioptric jump occurs. Similar to the case where the intra-cell transition and the inter-cell transition are different in the SSH model, the topology phase transition condition is provided with a different number of windings.
The structure of this embodiment enables the energy band originally having the Dirac point to be opened, the dielectric band to be shifted downward, the air band to be shifted upward, and finally the photonic band gap to appear, at this time, the upper band and the lower band of the photonic band gap have different numbers of windings in the guided mode, and the occurrence of the energy band generates the photonic band gap. Compared with the common photonic crystal, the one-dimensional topological photonic crystal of the embodiment adopts the traditional mode of constructing defects, and the slab waveguide structures with reverse structures and different topological phases are spliced on the other side of the photonic bandgap waveguide. Because the structure has no periodic similarity, the two crystal structures with different winding numbers can be spliced together and the generation of topological zero mode can be excited by directly changing the positions of the large and small circular air holes in the unit cell structures of the photon crystal groups with different sizes.
The above embodiments are merely illustrative of the preferred embodiments of the present application, and the scope of the present application is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present application pertains are made without departing from the spirit of the present application, and all modifications and improvements fall within the scope of the present application as defined in the appended claims.
Claims (8)
1. A biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity, comprising: the first straight waveguide, the micro-ring resonant cavity and the second straight waveguide are sequentially connected;
coupling points are formed between the first straight waveguide and the micro-ring resonant cavity in a coupling mode;
a one-dimensional topological photonic crystal group is arranged on the first straight waveguide; the one-dimensional topological photonic crystal group is horizontally distributed on the first straight waveguide.
2. The biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity according to claim 1, wherein the length of the first straight waveguide and the second straight waveguide is 15 μm to 30 μm, the width is 0.5 μm to 1 μm, and the thickness is 0.2 μm to 0.4 μm; the first straight waveguide and the second straight waveguide are made of SOI silicon-based optical waveguide materials; the micro-ring resonator has a width of 0.5 μm to 1 μm and a radius of 5 μm to 10 μm.
3. The biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity according to claim 1, wherein the one-dimensional topological photonic crystal group comprises: a first photonic crystal structure and a second photonic crystal structure; the first photonic crystal structure and the second photonic crystal structure are formed by interface splicing to form a surface state for realizing strong interaction between light and a substance.
4. The biosensor based on the one-dimensional topological photonic crystal coupling micro-ring cavity according to claim 3, wherein the first photonic crystal structure and the second photonic crystal structure are symmetrically distributed on the first straight waveguide with a splicing position as an axis.
5. The biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity according to claim 3, wherein the first photonic crystal structure comprises: circular holes which are arranged periodically; the period is set to be 12-18, each period comprises two round holes, and the arrangement mode is as follows: large round holes and small round holes.
6. The biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity according to claim 3, wherein the second photonic crystal structure comprises: circular holes which are arranged periodically; the period is set to be 12-18, each period comprises two round holes, and the arrangement mode is as follows: small round holes, large round holes.
7. The biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity according to any one of claims 5-6, wherein the large circular hole in the first photonic crystal structure is identical to the large circular hole in the second photonic crystal structure; the small round holes in the first photonic crystal structure are completely the same as the small round holes in the second photonic crystal structure; the first photonic crystal structure and the second photonic crystal structure have only round hole arrangement differences.
8. The biosensor based on one-dimensional topological photonic crystal coupling micro-ring cavity according to claim 7, wherein the radius of the large round hole is 0.1 μm to 0.2 μm; the radius of the small round hole is 0.05 μm to 0.1 μm; the center distance between the large circular hole and the small circular hole is 0.4 μm to 0.6 μm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120308181A1 (en) * | 2011-02-03 | 2012-12-06 | Mohammad Hafezi | Two-dimensional coupled resonator optical waveguide arrangements and systems, devices, and methods thereof |
| CN107703101A (en) * | 2017-09-25 | 2018-02-16 | 电子科技大学 | Biology sensor based on 1-D photon crystal coupling micro-loop chamber |
| CN107727611A (en) * | 2017-09-25 | 2018-02-23 | 电子科技大学 | A kind of SOI micro-loop photon biology sensors based on 1-D photon crystal |
| CN114966982A (en) * | 2022-04-25 | 2022-08-30 | 江苏大学 | Topological optical communication resonance device capable of realizing waveguide-cavity coupling |
| CN115167059A (en) * | 2022-05-23 | 2022-10-11 | 常州工业职业技术学院 | Method for generating harmonic based on topological edge state of one-dimensional photonic crystal |
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- 2023-06-25 CN CN202310748425.XA patent/CN116774352A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120308181A1 (en) * | 2011-02-03 | 2012-12-06 | Mohammad Hafezi | Two-dimensional coupled resonator optical waveguide arrangements and systems, devices, and methods thereof |
| CN107703101A (en) * | 2017-09-25 | 2018-02-16 | 电子科技大学 | Biology sensor based on 1-D photon crystal coupling micro-loop chamber |
| CN107727611A (en) * | 2017-09-25 | 2018-02-23 | 电子科技大学 | A kind of SOI micro-loop photon biology sensors based on 1-D photon crystal |
| CN114966982A (en) * | 2022-04-25 | 2022-08-30 | 江苏大学 | Topological optical communication resonance device capable of realizing waveguide-cavity coupling |
| CN115167059A (en) * | 2022-05-23 | 2022-10-11 | 常州工业职业技术学院 | Method for generating harmonic based on topological edge state of one-dimensional photonic crystal |
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