Highly compact optical waveguides with a novel pedestal geometry

A structure with a large refractive index ratio between waveguide and cladding materials can be fabricated with low scattering losses by using Ge on GaAs waveguides at 10-μm wavelengths. We demonstrate two types of ultra-high confinement (UHC) dielectric waveguides using separate geometries: A ridge...

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Bibliographic Details
Published in:IEEE photonics technology letters 1995-05, Vol.7 (5), p.526-528
Main Authors: Chaudhari, A.D., West, L.C., Roberts, C.W., Yicheng Lu
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Dielectric materials
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Geometrical optics
Integrated optics. Optical fibers and wave guides
Light scattering
Optical and optoelectronic circuits
Optical losses
Optical materials
Optical refraction
Optical scattering
Optical variables control
Optical waveguides
Refractive index
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Summary:A structure with a large refractive index ratio between waveguide and cladding materials can be fabricated with low scattering losses by using Ge on GaAs waveguides at 10-μm wavelengths. We demonstrate two types of ultra-high confinement (UHC) dielectric waveguides using separate geometries: A ridge and a novel pedestal. Computer simulations using a time-domain finite element method and microwave-scale experiments are performed on both waveguide types. We show a waveguide thickness of 0.18 of the free-space wavelength or greater guide well-confined single-mode light for both geometries. Numerical and experimental values of the effective index agree to better than 0.5%.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.384532