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Quasi-continuum bound state magnetic field sensor based on photonic crystal panel support

A photonic crystal and quasi-continuous technology, applied in the field of magnetic field sensors, can solve the problems of not being able to achieve high quality factor and high sensitivity at the same time, and achieve the effect of stable structure, simple coupling and high quality factor

Pending Publication Date: 2022-03-18
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the existing photonic crystal flat magnetic field sensor cannot achieve high quality factor and high sensitivity at the same time.

Method used

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  • Quasi-continuum bound state magnetic field sensor based on photonic crystal panel support
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  • Quasi-continuum bound state magnetic field sensor based on photonic crystal panel support

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Embodiment Construction

[0023]In order to make the purpose, technical solution and advantages of the present invention clearer, the specific structure, principle and sensing characteristics of the invention will be further described below in conjunction with the accompanying drawings.

[0024] The present invention proposes to combine the photonic crystal flat plate with the magnetic flow thin film, and break the structural symmetry of the nanohole weakly, and the vertical incidence of the light source excites the bound state of the symmetrical protective quasi-continuum. The schematic diagram of the magnetic field sensor is as follows figure 1 As shown in (a), the substrate is silicon dioxide, and the thicknesses of the magnetic flux film, the photonic crystal plate and the substrate are 400nm, 150nm and 2000nm in sequence. When the surrounding magnetic field strength changes, the refractive index of the magnetic flux film also changes, thereby affecting the shift of the quasi-continuum bound state r...

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Abstract

The invention relates to a quasi-continuum bound state magnetic field sensor based on photonic crystal panel support, and belongs to the technical field of photonic crystal sensors. According to the invention, a photonic crystal flat plate breaking a symmetrical structure is combined with a magnetic current film for the first time, and a symmetrical protection type quasi-continuum bound state mode is excited in a vertical incidence mode for magnetic field intensity sensing. The photonic crystal flat plate adopts the square nanopores, the symmetry of the nanopores is slightly broken, a non-suspension structure is adopted, the preparation difficulty is low, and the structure is stable. The bound state mode quality factor of the excited quasi-continuum is up to 2 * 10 < 4 >, meanwhile, the interaction between light and a magnetic current film is enhanced by a relatively large nanopore structure, and the magnetic field sensitivity of 88nm / T is realized. In addition, the resonance amplitude of the bound state of the quasi-continuum is up to 0.97, and interference of environmental noise can be effectively resisted. Compared with other types of photonic crystal magnetic field sensors, the photonic crystal magnetic field sensor has excellent sensing performance of high quality factor, high sensitivity and large resonance amplitude, and is suitable for high-precision magnetic field sensing in a complex environment.

Description

technical field [0001] The invention relates to a magnetic field sensor based on a quasi-continuum bound state supported by a photonic crystal flat plate, which is characterized by excellent sensing performance and belongs to the technical field of photonic crystal sensors. Background technique [0002] The detection of magnetic field strength is widely used in aerospace, power transmission, medical detection, and navigation systems (Document 1: Han Du, Guangya Zhou, Yunshan Zhao, Guoqiang Chen and Fook Siong Chau. "Magnetic field sensor based on coupled photonic crystal nanobeam cavities”, Applied physics letters 110(6), 061110(2017); Document 2: James Lenz and AlanS.Edelstein. “Magnetic sensors and their applications”, IEEE Sensors journal 6(3), 631-649(2006).) . Compared with other optical magnetic field sensors, the magnetic field sensor based on photonic crystal plate has the advantages of compact structure, strong light field localization ability and stable performanc...

Claims

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/032G01R33/0011
Inventor 田慧平韩哲王金志苟子幸聂潼羽
Owner BEIJING UNIV OF POSTS & TELECOMM
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