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Temperature dependence of the reflectivity in absorbing Bragg reflectors

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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.

©2001 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. Measured reflection spectra of absorbing Bragg reflectors as a function of temperature.
Fig. 2.
Fig. 2. Calculated reflection spectra of absorbing Bragg reflectors as a function of temperature.
Table. 1.
Table. 1. Values of dip positions, κs , and αs as functions of temperature.
Fig. 3.
Fig. 3. Temperature dependence of the experimentally measured (solid circles) and theoretically predicted (solid line) bandwidth of the stop band.
Fig. 4.
Fig. 4. Temperature dependence of the experimentally measured (solid circles) and theoretically predicted (solid line) center of the stop band.
Fig. 5.
Fig. 5. Temperature dependence of the experimentally measured (solid circles) and theoretically predicted (solid line) dip position in the stop band.

Equations (2)

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( M 11 M 12 M 21 M 22 ) = D 0 1 · D c · P c · D c 1 · [ D L · P L · D L 1 · D H · P H · D H 1 ] 27 · D H ,
Δ ω ( T ) = 4 π · sin 1 n H ( T ) n L ( T ) n H ( T ) + n L ( T ) · ω ( T ) ,
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