Resonance and sensing characteristics of horn-shaped cavity-coupled MIM waveguide

The resonant coupling of optical microcavities to waveguides is important in photonic devices. In this paper, a horn-shaped cavity structure designed on the side metal–dielectric–metal waveguide, and between waveguide simulated by finite-difference time-domain method coupled mode theory. It found that local modes appear cavity. Second, geometric parameters are changed, influence structural transmission spectrum obtained theoretical analysis. Third, maximum refractive index sensitivity calculated be 1750 nm/RIU, temperature 2.455 nm/°C. Ultrafine particles placed tips structure, wavelength shift localized change transmittance trapezoidal particle size obtained; nanoparticle sensor using characteristic. resonator proposed paper provides high-performance choice for design application micro-nano