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(a) Laser setup schematic. (b) Optical microscope picture of three graphitic columns with various depths.
Electric field simulations [COMSOL Multiphysics] in the hybrid and planar geometries. Electric field color map is plotted in logarithmic scale. (a) Hybrid geometry: an array of 5 by 5 channels (30 μm diameter, 500 μm depth) with 150 μm pitch. The channels are connected all together with an aluminum pad on the top surface. On the back surface, an aluminum pad has been evaporated too. (b) Planar geometry: two aluminum contacts evaporated on the top and back surfaces of the pc-CVD diamond sample.
Dark current measurements within both active areas. Planar detector's characteristic is plotted in filled grey triangle. Hybrid detector's I(V) curve is plotted in filled black square.
CCE comparison of both devices. α-particles impinging the device from the top (a) or the back (b) sides.
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