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xz cross sections (y = 3.95 μm) of one pixel in a (a) conventional grating and (b) concave reflector structure. The length unit is μm. Insets in (a) and (b) show the xy cross sections.
(Color online) Photocurrents from three absorbing layers in the pixel structures of Fig. 1 excited by a radiation pulse (wavelength 2 ∼ 10 μm). (a-c): reflective grating and (d-f): concave. Thin solid lines are Jx (t), thick solid lines are Jy (t), and dash lines are Jz (t). T (vertical dash lines) denotes the time when the pulse reaches the metal (z = 9.75 μm in Fig. 1).
(Color online) Corner diffraction from local pixel and crosstalk from neighboring pixels in the grating structure. (a) Schematics and (b) spatial distribution of the Ez amplitude excited by a radiation pulse.
(Color online) Spatial distributions of (a,b,c) Ex and (a’,b’,c’) Ez in the concave pixel structure at three different times excited by a radiation pulse. Arrows mark the motion of the electric field.
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