Distributed Bragg reflectors based on (Zn, Cd, Mg)Se for use in the visible spectral range

Distributed Bragg reflectors (DBRs) based on ZnCdSe and ZnCdMgSe quarter wa ve layers have been grown on InP (001) substrates by molecular beam epitaxy . Their reflectivity maxima were controlled by the individual thicknesses o f constituent layers, and were adjusted in the range of 615-500 nm, coverin g the red, green, and blue-green regions of the visible spectrum. The cryst al quality of the structures was assessed by double crystal x-ray diffracti on measurements. Reflectivity as high as 95% was achieved for the DBR struc tures that consisted of 16 periods. Theoretical calculations, based on the transfer matrix method, predict that a reflectivity above 99% can be achiev ed by increasing the number of periods to between 20 and 26. (C) 2001 Ameri can Institute of Physics.