Electroabsorption in InGaAsP-InP double heterostructures
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This letter reports the measurements of electroabsorption in InGaAsP-InP double heterostructures for electric fields in the range of 10–300 kV/cm. The absorption of the waveguide modes is very large (-40 cm−1 cm at−5 V applied bias) for photon energies ~;100 meV from the bandgap The electro-absorption is polarisation dependent. The absorption for light polarised along the field (TM-mode) is larger than that for light polarised normal to the field (TE-mode). The electroabsorption effect can be used to produce light amplitude modulators, polarisers and photodetectors.