Journal
OPTICS LETTERS
Volume 41, Issue 3, Pages 610-613Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.000610
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Funding
- EPSRC [EP/L01162X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L01162X/1, 1238894] Funding Source: researchfish
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We present Vernier-effect photonic microcavities based on a germanium-on-silicon technology platform, operating around the mid-infrared wavelength of 3.8 mu m. 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 similar to 5 dB, maximum extinction ratios of similar to 23 dB, 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 similar to 1700. (C) 2016 Optical Society of America
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