Uniform-field transverse electroreflectance using a mode-locked laser and a radio-frequency bias

Wahlstrand, J. K.; Zhang, H.; Cundiff, S. T.
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p101104
Academic Journal
We describe a technique for transverse electroreflectance that uses broadband optical pulses from a mode-locked laser and a rapidly oscillating bias with a frequency near half the laser repetition rate. Since the electrodes are electrically isolated from the sample, highly nonuniform trap-enhanced fields do not occur. Because the time-averaged electric field is zero, space charges do not build up. Experimental results are presented for semi-insulating GaAs. The technique is also useful in ultrafast experiments that require a uniform transverse electric field.


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