Improved Cylindrical Cavity With Symmetric Double Ridges for High-Sensitivity Detection

In this letter, an improved cylindrical cavity for high-sensitivity detection is proposed. The cylindrical cavity is characterized by symmetric double ridges inside. The double-ridged cavity realizes the electric field compression of TE01n modes by loading two symmetric metal ridges and further greatly improves the detection sensitivity. The parameters of the ridge are optimized and determined by considering the compromise between frequency detection sensitivity, quality factor, and the current fabrication technique. Several fiber monofilaments with diameters of only a dozen micros are separately inserted into the cavity and detected. To illustrate more clearly the advantage of the proposed cavity for the detection of slim materials, the sensitivity per unit of volume (0.32%) is compared and the value is higher than the related research works.

Automated summary

This letter proposes an improved cylindrical cavity for high-sensitivity detection. The cavity is characterized by symmetric double ridges inside, which compress the electric field and significantly improve the detection sensitivity. By optimizing the ridge parameters, considering the compromise between detection sensitivity, quality factor, and fabrication technique, the cavity design is determined. The proposed cavity shows higher sensitivity per unit volume (0.32%) compared to related research works.