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A novel microring resonator sensor coated with a single negative metamaterial (SNM) layer is proposed.The dispersion relation of hollow cylindrical dielectric waveguide covered with a SNM layer is derived,and resonant frequencies of the corresponding whispering gallery mode are computed.We find that there is a good agreement between the theoretical results and numerical results of resonant frequencies and electric field distributions.Compared with traditional resonator sensor,the sensitivity and resolution are significantly enhanced by SNM,and Q factor can be tailored by adjusting the distance between waveguide and microring.