Development of optical filters using nano cale ring resonators

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We have developed a plasmonic racetrack resonator. The trench structure is adopted for the resonator. The radius of the curved portion of the racetrack is 500 nm. The size of the resonator is the smallest size ever reported. However, the quality factor of the resonator decreases when the shape of the structure is racetrack. We have proposed the double racetrack resonator structure for improving the quality factor. The double racetrack resonator can increase the quality factor as 1.5 times.