Waveguiding structures are one of the fundamental components of integrated photonic circuitry. Devices with low loss and a linear response across a wide wavelength range are especially desirable. In the present Letter, we have successfully developed and characterized low-loss silica waveguides integrated on a silicon substrate with a novel suspended cylinder geometry. The unique design creates a device that is effectively air clad, resulting in a large refractive index contrast for improved optical field confinement. The measured loss is constant from 658 to 1550 nm, and it is independent of the polarization of the input light and the input power.
© 2011 Optical Society of America
Original Manuscript: July 15, 2011
Revised Manuscript: August 17, 2011
Manuscript Accepted: August 24, 2011
Published: September 19, 2011
Ashley J. Maker and Andrea M. Armani, "Low-loss silica-on-silicon waveguides," Opt. Lett. 36, 3729-3731 (2011)