Fano resonance sensing apparatus based on axisymmetric optical micro-cavity, and apparatus thereof

Abstract

The invention provides a Fano resonance sensing apparatus based on an axisymmetric optical micro-cavity. The Fano resonance sensing apparatus comprises an axisymmetric optical micro-cavity and a coupled waveguide, wherein the axisymmetric optical micro-cavity has a columnar shape and comprises a straight cylinder type solid cylinder micro-cavity, a straight cylinder type hollow cylinder micro-cavity, a microbubble-like solid cylindrical micro-cavity, a microbubble-like hollow cylindrical micro-cavity, a micro ring cavity, a metal-coated cylindrical micro-cavity and the like, the material of the micro-cavity is silicon dioxide, a macromolecule polymer, an optic crystal, a semiconductor material and the like, and the coupled waveguide is optical fibers with a diameter of 0.5-1.5 [mu]m, a coupled prism having high refractive index, an on-chip integrated waveguide and the like. According to the present invention, the discrete high-order echo wall mode in the micro-cavity and the continuous background light are subjected to offset interference, such that the dynamically-changing Fano resonance spectrum can be stably and effectively produced.

Description

technical field [0001] The invention relates to the technical field of optical sensing, and more particularly, to the Fano resonance sensing technology based on micro-nano structures. Background technique [0002] As an important direction in the background of life sciences, biochemical sensing technology has always been a research hotspot. At present, the detection technology of biomolecules is mainly based on the traditional analysis method, namely chemical method, which often includes a series of tedious operation processes, and the cycle is long, which is far from meeting the actual needs. At the end of the 20th century, scientists began to study the sensing detection technology with strong specificity, high sensitivity and easy operation. In recent years, thanks to the cross-development of life sciences, analytical chemistry, physics and informatics, the research of biosensors based on micro-nano structures has become a hot spot of many scholars. [0003] The concept ...

AI Technical Summary

Problems solved by technology

[0005] In the study of FR, most research groups still stay on the excitation of FR at the experimental level. The sophisticated and unstable structure makes the application of FR a big bottleneck.

In the field of biosensing, theoretical studies have already verified that FR-based sensing has a very high refractive index sensitivity. However, in experiments, it has been difficult to make breakthroughs in the research of FR-based sensing in microcavities.

In summary, there are two reasons: first, the physical structure of FR excitation is complex, and it is difficult to precisely control the FR spectrum; second, it is difficult to build a stable and efficient sensing experiment platform by integrating the excitation and application of FR

In 2016, Xu Lei's research group from Fudan University used microbubble resonators to conduct optical flow sensing experiments in "Fano resonance and improved sensing performance in aspect-simplified Optofluidic micro-bubble resonator by introducing selective modal losses". However, the experiment The method provided has a lot of room for improvement, both in principle and in application. The problems include the following three points. First, the excited transmission spectrum is messy and the modes are difficult to distinguish. Second, the Fano resonance presented in the experimental results The spectral shape is still a Lorentzian transmission spectrum, and cannot be dynamically adjusted; 3. Although the sensitivity of the sensor reaches 48.8nm / RIU, it is still relatively low. In the application scenario, it still needs to be further improved

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