Fig. 2: The two photodetectors used for free-space transmission and their characteristics. | Nature Communications

Fig. 2: The two photodetectors used for free-space transmission and their characteristics.

From: Unipolar quantum optoelectronics for high speed direct modulation and transmission in 8–14 µm atmospheric window

Fig. 2

a SEM picture of the stripe-based QCD and the view with its coplanar waveguide. The QWIP used in this experiment has the same structure and appearance. b The zoomed-in image on the device. Each stripe is 1.5 μm wide and the space between each stripe is 7 μm. Both the QCD and the QWIP are metamaterial-patterned. c Lateral view of a single detector stripe cavity resonator with its active region (AR). d Sketch of the stripe-array detector with illustrations of the electric field \(\overrightarrow{{{{{\bf{E}}}}}}_{{{{\bf{cav}}}}}\) induced by the incident electromagnetic signal \({S}_{{in}}\) polarized along the resonant dimension of the stripe. \(\overrightarrow{{{{{\bf{E}}}}}}_{{{{\bf{cav}}}}}\) turns vertical to both meet the polarization selection requirement. e The normalized photocurrent response spectra for both the QCD (orange), and the QWIP (green). f The characterized detection bandwidth of the QCD (orange) and the QWIP (green) with electrical rectification.

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