Journal
IEEE PHOTONICS JOURNAL
Volume 3, Issue 6, Pages 1171-1180Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2011.2171930
Keywords
Absorption; electrooptic modulators; semiconductor impurities; silicon
Funding
- EPSRC [EP/F001428/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F001428/1] Funding Source: researchfish
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We present relationships for the free-carrier-induced electrorefraction and electroabsorption in crystalline silicon over the 1-14-mu m wavelength range. Electroabsorption modulation is calculated from impurity-doping spectra taken from the literature, and a Kramers-Kronig analysis of these spectra is used to predict electrorefraction modulation. More recent experimental results for terahertz absorption of silicon are also used to improve the commonly used 1.3- and 1.55-mu m equations. We examine the wavelength dependence of electrorefraction and electroabsorption, finding that the predictions suggest longer wave modulator designs will, in many cases, be different from those used in the telecom range.
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