CUTOFF FREQUENCY AND RESPONSIVITY LIMITATION OF ALINAS/GAINAS MSM PD USING A 2-DIMENSIONAL BIPOLAR PHYSICAL MODEL

Using a 2-D bipolar physical model we highlight the main parameters that govern the long-wavelength MSM PD performance (cutoff frequency and responsivity). This covers applied potential, electrode spacing, absorbing layer thickness, and heterojunction effect. We also report that using a backside illumination technique and a thin absorbing layer we can reach a cutoff frequency as high as 65 GHz with a responsivity of 0.2 A/W.