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Resonant two-photon photoemission in quantum-well infrared photodetectors
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View: Figures


Image of FIG. 1.
FIG. 1.

Normalized absorption from the ground to the intermediate state in Brewster-angle geometry at (dashed lines). The solid lines show the photocurrent due to excitation from the thermally populated intermediate state into the continuum resonance at a bias voltage of and (sample 1) and (sample 2). The inset shows a conduction band energy diagram (solid line) of one quantum well. The two bound subbands and the continuum resonance are indicated by the shaded regions.

Image of FIG. 2.
FIG. 2.

Intensity autocorrelation trace of sample 1 (solid line) and a numerical fit describing the finite response of the detector (dashed line). The measurements were performed at a bias voltage of and . For comparison the ideal trace (dotted line) of a Gaussian pulse of duration is also shown [Eq. (2)]. The schematics of the experimental setup are given in the inset.

Image of FIG. 3.
FIG. 3.

(a) Photocurrent of sample 1 vs applied bias voltage at power densities as indicated. The device is illuminated by a -laser at . The solid lines represent curves obtained from simulation of the linear component due to tunneling of electrons from the intermediate state into the continuum. (b) Transition from quadratic to linear behavior of the photocurrent. The insets show band structure diagrams under low (left) and high (right) bias voltage. The arrows symbolize the optical excitation and the escape mechanism.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant two-photon photoemission in quantum-well infrared photodetectors