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Germanium-on-silicon Vernier-effect photonic microcavities for the mid-infrared

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Abstract

We present Vernier-effect photonic microcavities based on a germanium-on-silicon technology platform, operating around the mid-infrared wavelength of 3.8 μm. Cascaded racetrack resonators have been designed to operate in the second regime of the Vernier effect, and typical Vernier comb-like spectra have been successfully demonstrated with insertion losses of 5dB, maximum extinction ratios of 23dB, and loaded quality factors higher than 5000. Furthermore, an add–drop racetrack resonator designed for a Vernier device has been characterized, exhibiting average insertion losses of 1 dB, extinction ratios of up to 18 dB, and a quality factor of 1700.

© 2016 Optical Society of America

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