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Broad band optical transmission measurements in semiconductor waveguides Morin, Richard Henry
Abstract
A broad band optical transmission measurement system has been realized to determine properties of light propagation in semiconductor waveguides in the 800-1200 nm wavelength range. Illumination from a halogen source is coupled to a single-mode optical fibre and focused onto the input facet of the waveguide via a confocal, diffraction limited lens system. The output light is imaged by another diffraction limited lens through a spatial filter and coupled into a high resolution Fourier Transform Interferometer. The samples studied were epitaxially grown, strained InGaAs quantum well waveguide structures. Measurements of the transmitted spectra over a -1600 cm-1 spectral range in the vicinity of the fundamental absorption edges of these samples resulted in the determination of the guided mode's group index of refraction (and its dispersion), and the absolute absorption coefficient for both transverse electric (TE) and transverse magentic (TM) polarizations. The measured group indices were compared to those calculated by solving Maxwell's equations using a simple quasi-two dimensional model for the InGaAs quantum well's index of refraction. Agreement with the TE group index data was good, but the large difference in the TE and TM dispersion near the bandgap energy clearly demonstrates the anisotropic nature of the quantum well's index of refraction. The TM absorption edge was well above the InGaAs bandgap and its detailed shape was successfully compared with a calculation based on a bandstructure obtained using k-p theory. The TE absorption was measured below the InGaAs bandgap and it's exponential energy dependence was tentatively interpreted in terms of a bulk model for the Urbach
Item Metadata
Title |
Broad band optical transmission measurements in semiconductor waveguides
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1995
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Description |
A broad band optical transmission measurement system has been realized to
determine properties of light propagation in semiconductor waveguides in the 800-1200
nm wavelength range. Illumination from a halogen source is coupled to a single-mode
optical fibre and focused onto the input facet of the waveguide via a confocal, diffraction
limited lens system. The output light is imaged by another diffraction limited lens through
a spatial filter and coupled into a high resolution Fourier Transform Interferometer. The
samples studied were epitaxially grown, strained InGaAs quantum well waveguide
structures. Measurements of the transmitted spectra over a -1600 cm-1 spectral range in
the vicinity of the fundamental absorption edges of these samples resulted in the
determination of the guided mode's group index of refraction (and its dispersion), and the
absolute absorption coefficient for both transverse electric (TE) and transverse magentic
(TM) polarizations.
The measured group indices were compared to those calculated by solving
Maxwell's equations using a simple quasi-two dimensional model for the InGaAs quantum
well's index of refraction. Agreement with the TE group index data was good, but the
large difference in the TE and TM dispersion near the bandgap energy clearly demonstrates
the anisotropic nature of the quantum well's index of refraction.
The TM absorption edge was well above the InGaAs bandgap and its detailed shape
was successfully compared with a calculation based on a bandstructure obtained using k-p theory. The TE absorption was measured below the InGaAs bandgap and it's exponential
energy dependence was tentatively interpreted in terms of a bulk model for the Urbach
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Extent |
4954488 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-01-27
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0074513
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.