A Photonic Crystal Triple Resonant Cavity Athermal Biosensor

Abstract

The invention discloses a photonic crystal three-resonant cavity athermalization biosensor. The photonic crystal three-resonant cavity athermalization biosensor comprises a substrate, as well as a plurality of first dielectric cylinders and a plurality of second dielectric cylinders which are vertically arranged on the substrate in a matrix manner, wherein the radiuses of the first dielectric cylinders are r, the radiuses of the second dielectric cylinders are ra, r is not equal to ra, wherein the plurality of second dielectric cylinders are divided into three parts to form a main waveguide and two coupling waveguides respectively, the two coupling waveguides are respectively and symmetrically arranged on two sides of the main waveguide, the main waveguide is linear and is a photonic crystal straight waveguide, the two coupling waveguides are in a shape of quarter turn, the plurality of first dielectric cylinders are filled among the main waveguide and the two coupling waveguides which are mutually independent, three photonic crystal resonant cavities are arranged between the two coupling waveguides and the main waveguide, and the main waveguide and the two coupling waveguides are respectively coupled with the three photonic crystal resonant cavities.

Description

technical field [0001] The invention relates to a biological sensor, in particular to an athermalized biological sensor with a photonic crystal triple resonant cavity. Background technique [0002] Biosensors use biologically active units as biologically sensitive units and are highly selective detectors for analytes. They have important applications in environmental monitoring, biological defense, food testing, disease monitoring, and drug development. In recent years, with the development of photonic integration technology and the introduction of the concept of Lab-on-a-chip, biosensors based on photonic crystal resonators have the advantages of fast detection speed, high sensitivity, good real-time performance, It has become one of the research hotspots in the field of biosensing due to the advantages of no labeling, no interference from environment and power frequency. [0003] The biosensor market is huge and is on the rise every year. According to Market Research, a p...

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Problems solved by technology

However, this method also has some inherent disadvantages

Due to the high integration characteristics of biosensors based on resonant cavities, a chip can integrate hundreds of sensing units. If a whole biosensing chip is equipped with only one reference resonant cavity, the distance between the reference resonant cavity and the detection resonant cavity will be too large. In actual application, if the temperature of the chip is not uniform, the reference resonator cannot provide a valuable reference value

However, if a reference resonant cavity is arranged in each sensing unit, there will be a waste of area, which is not conducive to the design and manufacture of highly integrated biosensing chips.

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