Abstract
The measured current response of ultrapure Ge far-infrared photoconductors at 4.2 K exhibits behavior characteristic of driven nonlinear oscillators including a period doubling cascade to chaotic oscillation which produces deterministic broadband noise with noise temperature T n ∼10 8 K, frequency locking effects, and intermittency which produces low-frequency noise of the form 1/f α with α∼0.5 to 1.5. This deterministic broadband and low-frequency noise is fundamentally different from noise due to stochastic mechanisms such as Johnson and shot noise. Reduction of the deterministic noise level by greater than 30 dB has been achieved by locking onto a strong sinusoidal drive voltage. These experimental results are in good agreement with numerical solutions of a simple nonlinear rate equation model of extrinsic photoconductors.
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