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Refractive Index Measurements of BeZnTe and Related Superlattices on InP and Application for Waveguide Analysis of MgZnCdSe/BeZnTe Visible Lasers
Author(s) -
Nomura I.,
Che S.B.,
Ochiai Y.,
Kikuchi A.,
Shimomura K.,
Kishino K.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200201)229:2<987::aid-pssb987>3.0.co;2-c
Subject(s) - cladding (metalworking) , refractive index , superlattice , materials science , optoelectronics , laser , optics , band gap , layer (electronics) , waveguide , wavelength , step index profile , optical fiber , nanotechnology , graded index fiber , physics , composite material , fiber optic sensor
Refractive indices of BeZnTe, ZnCdSe/BeZnTe superlattices (SLs) and MgSe/BeZnTe SLs grown on InP substrates were measured for the first time. The refractive index of BeZnTe with a wide bandgap ( E g ) of 3.12 eV was higher than that of ZnCdSe with a narrower E g of 2.1 eV. This tendency in BeZnTe is unexpected, because for other materials, wider bandgaps may generally give lower indices. The refractive indices of the ZnCdSe/BeZnTe and MgSe/BeZnTe SLs were controlled in the wide range by changing the layer thickness combination. Waveguide analysis is performed for laser structures consisting of ZnCdSe/BeZnTe SL active layer and MgSe/BeZnTe SL p‐cladding layer. As a result, optical confinement factors around 5.9% are estimated at a wavelength of 564 nm.