Abstract
The quality factor (Q value) is a vital parameter for evaluating the sensitivity feature of optical sensors. A comparative study of Q values is carried out by analyzing the absorption peaks of the attenuated total reflection in the surface plasmon resonance, long-range surface plasmon resonance, metal clad leaky waveguide, and symmetrical metal-cladding waveguide. The calculation results show that the full width at half maximum of the ultrahigh-order modes, which are excited in the SMCW, can be reduced to the order of 10−2 nm, and the corresponding Q value can be enhanced to the order of 104, which is far beyond those of other sensing structures.
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