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半导体学报 2004
Absorption and Reflectivity of GaInP/AlGaInP Multiple Quantum Wells:Influence and Reduction of Multi-Beam Interference
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Abstract:
By measuring optical absorption of GaInP/AlGaInP MQWs,the difficulty is explicitly illustrated in studying by the absorption spectroscopy.The high frequency oscillation observed in the absorption is identified to be multi-beam interference.A manner is taken to diminish the interference by reducing the effective thickness of the sample.Improved sample structures are proposed for reflectivity measurement,which leads exciton transitions to be unambiguously identified.With the aid of spectroscopic derivative,the excitonic transition energy can be definitely determined,which warrants a reliable reflectivity study of the optical properties of the MQW systems.
