Journal
OPTICS EXPRESS
Volume 18, Issue 12, Pages 12127-12135Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.012127
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Funding
- AFOSR YIP
- NSF STC MDITR Center at the University of Washington
- Tektronix Corporation
- Murdock Foundation
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Silicon waveguides are now widely used to guide radiation in the near-infrared, mainly in the wavelength range of 1.1 - 2.2 mu m. While low-loss waveguides at longer wavelengths in silicon have been proposed, experimental realization has been elusive. Here we show that single-mode integrated silicon-on-sapphire waveguides can be used at mid-infrared wavelengths. We demonstrate waveguiding at 4.5 mu m, or 2222.2 cm(-1), with losses of 4.3 +/- 0.6 dB/cm. This result represents the first practical integrated waveguide system for the mid-infrared in silicon, and enables a range of new applications. (C)2010 Optical Society of America
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