Chiral molecular detector based on topological insulator photoelectric effect
A technology of topological insulators and chiral molecules, applied in the direction of material analysis, instruments, and measuring devices through optical means, to achieve good application prospects and low cost
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Embodiment 1
[0021] The present invention provides a chiral molecular detector based on the photoelectric effect of a topological insulator, such as Figure 1 Shown, including gate 1, insulation layer 2, topological insulator layer 3, source 5, drain 6. Gate 1 is a thin film layer, gate 1 is placed at the bottom of the insulating layer 2 to apply gate pressure to the above heterojunction. The material of Gate 1 is gold or silver or gallium alloy. The material of the insulation layer 2 is an insulating material, further, the material of the insulation layer 2 is silica. Topological insulator layer 3 is placed on insulation layer 2. The material of the topological insulator layer 3 is bismuth telluride or bismuth selenide or antimony telluride. Source 5 and drain 6 are placed on topological insulator layer 3. Sources 5 and drain 6 are made of gold or silver or platinum.
[0022] When applied, chiral molecule 4 is placed between source 5 and drain 6 above the topological insulator layer 3, while ...
Embodiment 2
[0026] On the basis of Example 1, the topological insulator layer 3 is provided with a groove on the surface, and the chiral molecule 4 is placed within the groove. The groove is placed between source 5 and drain 6. The groove does not penetrate the topological insulator layer 2, in order to facilitate the surface state of the topological insulator material at the bottom of the groove. Since the surface state of the topological insulator layer 3 is distributed on the surface of the topological insulator material, it also has a surface state at the bottom of the groove, and the groove does not affect the contact between chiral molecule 4 and the surface state. The setting of grooves on the topological insulator layer 3 also facilitates the setting of chiral molecule 4 in a fixed area, determining the repeatability of each measurement.
[0027] In the present embodiment, the size and shape of the grooves are not limited. Grooves can be rectangular, square, circular, irregular shap...
Embodiment 3
[0029] On the basis of Example 2, e.g., Figure 2 As shown, the grooves are circular, the grooves are periodically distributed on the surface of the topological insulator layer 3, specifically, the period of the groove distribution is a square period. The groove does not penetrate the topological insulator layer3. The diameter of the circle is less than 1 micron, and the depth of the groove is greater than 1 micron. When applied, the wavelength of incident light is less than 1 micron. The distance between adjacent grooves is greater than 200 nm. In this way, the incident light is confined to the groove, which forms a resonant cavity. Under the incident of different circular polarized light, a strong chiral field can be formed in the groove, and the chiral field of different chiral properties interacts with the chiral molecule 4 / topological insulator material, which changes the heterojunction of the interface between the chiral molecule 4 and the topological insulator material, th...
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