Group IV mid-infrared photonics
- Mashanovich, G. Z.
- Nedeljkovic, M.
- Soler Penades, J.
- Mitchell, C. J.
- Khokhar, A. Z.
- Littlejohns, C. J.
- Stankovic, S.
- Troia, B.
- Wang, Y.
- Reynolds, S.
- Passaro, V. M. N.
- Shen, L.
- Healy, N.
- Peacock, A. C.
- Alonso-Ramos, C.
- Ortega-Monux, A.
- Wanguemert-Perez, G.
- Molina-Fernandez, I.
- Rowe, D. J.
- Wilkinson, J. S.
- Cheben, P.
- Ackert, J. J.
- Knights, A. P.
- Thomson, D. J.
- Gardes, F. Y.
DOIAbstract
In this paper we present SOI, suspended Si, and Ge-on-Si photonic platforms and devices for the mid-infrared. We demonstrate low loss strip and slot waveguides in SOI and show efficient strip-slot couplers. A Vernier configuration based on racetrack resonators in SOI has been also investigated. Mid-infrared detection using defect engineered silicon waveguides is reported at the wavelength of 2-2.5 \u3bcm. In order to extend transparency of Si waveguides, the bottom oxide cladding needs to be removed. We report a novel suspended Si design based on subwavelength structures that is more robust than previously reported suspended designs. We have fabricated record low loss Ge-on-Si waveguides, as well as several other passive devices in this pla...
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