Abstract
Nano- and micro-photonics are the key-enabling tools for future integrated components and circuitry operating at low power and high speed. By using a strip-loaded platform, we show how we can dramatically reduce the complexity, in terms of fabrication and tolerances, of the most advanced devices. Different configurations of multimode interference devices are presented. We show the design, fabrication, and optical characterization of these components.
Highlights
A strip-loaded waveguide consists of a high refractive index thin film, in which light is confined laterally by a strip patterned on to of it [1]
The loading strip must have a refractive index lower than the effective index of the guided slab mode in order to avoid leaking of light in it
We have recently demonstrated that such a strip-loaded waveguide can be combined with a horizontal slot waveguide [2] in order to confine at the nanoscale the electric field in a low refractive index layer sandwiched between two high refractive index films [3,4]
Summary
A strip-loaded waveguide consists of a high refractive index thin film, in which light is confined laterally by a strip patterned on to of it [1]. This structure offers a high level of degree of freedom in terms of materials, features, and fabrication constraints. Glasses, titanium dioxide strip loaded waveguides have been demonstrated successfully in the past years. The loading strip must have a refractive index lower than the effective index of the guided slab mode in order to avoid leaking of light in it.
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