Abstract
The reflectivity of absorbing Bragg reflectors consisting of a GaAs/AlAs Bragg mirror and a InGaAs/InGaAsP multiple-quantum-well cavity layer was studied as a function of temperature. An absorption dip in the stop band due to the optical confinement of the Fabry-Perot resonance was observed in the reflectivity spectra. The absorption intensity of the dip increased with temperature and was explained by the resonant coincidence of the Fabry-Perot cavity mode and the quantum-well absorption. The temperature-dependent reflectivity spectra were successfully reproduced using the transfer matrix method and the linear dependence of the refractive index on temperature.
Highlights
Bragg reflectors have attracted a great deal of attention owing to their applications in optoelectronic devices, such as microcavity light-emitting diodes and vertical-cavity surface emitting lasers (VCSELs)
The reflectivity of absorbing Bragg reflectors consisting of a GaAs/AlAs Bragg mirror and a InGaAs/InGaAsP multiple-quantum-well cavity layer was studied as a function of temperature
An absorption dip in the stop band due to the optical confinement of the Fabry-Perot resonance was observed in the reflectivity spectra
Summary
Bragg reflectors have attracted a great deal of attention owing to their applications in optoelectronic devices, such as microcavity light-emitting diodes and vertical-cavity surface emitting lasers (VCSELs). These devices usually require highly transparent dielectric layers to eliminate any loss due to the optical absorption in the Bragg reflectors. Since the absorption effect is essential in such optoelectronic devices an understanding of the fundamental properties of the optical absorption in the Bragg reflectors is desired This topic has been much investigated [4,5,6]. The optical absorption of absorbing Bragg reflectors due to the caplayer effect has been studied and a spectral dip in the high reflection band has been shown to originate from the absorption layers [4]. The temperaturedependent reflectivity spectra of the absorbing Bragg reflector were analyzed using the transfer matrix method and the linear dependence of the refractive index on temperature
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