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Energy band diagram of the two SL detector structures: sample A (bottom) and sample B (top) used in this study.
The electrical gain, , vs the applied bias, , for sample A (bottom) and sample B (top) at various temperatures as indicated in the graph.
The current noise, , vs frequency of the devices d1 and d2 (both from sample A) at several applied bias voltages as indicated on the graph. The roll-off of the noise amplitude at frequencies above 5 kHz is attributed to the upper limit of current amplifier bandwidth.
The noise, , of device d1 at and of device d2 at . Inset: the noise gain, , vs detector bias for devices d1 and d2 at .
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