Different optical properties in different periodic slot cavity geometrical morphologies
Zhou Jing, Shen Meng, Du Lan, Deng Caisong, Ni Haibin, Wang Ming†,
       

(a) Reflectance spectra of annular cavity arrays with liquids of different refractive indices infiltrated in the cavities. (b) Relationships between wavelengths of dips J1J4 and refractive indices of infiltrated liquids.