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(Color online) (a) Device geometry. It consists of a gold slab on a low-index oxide substrate. The central slit through the slab is filled with mercury cadmium telluride (MCT), the active detector material. A periodic set of grooves is patterned on both sides. The insets show the magnified views of the slit and one of the grooves. The slab is infinitely long but the number of the grooves is finite. (b) Magnetic field pattern for a device with , , , , , and , operating at . The insets show the magnified views of the field in the central slit and in one of the grooves.
(Color online) (a) Geometry of a device consisting of a single slit. (b) Geometry of a bulk MCT photodetector with an antireflection coating. (c) Absorption cross section in units of for the structure in Fig. 2(a) with as a function of the slit width and wavelength.
(Color online) (a) Absorption cross section (red line) as a function of wavelength for , , , , , and . We also show the light power transmitted into the upper aperture of the slit (blue line) normalized by the plane wave flux. The dashed line shows the absorption cross section for the single-slit device of Fig. 2(a) with and the same as above. (b) Absorption cross section (red line) and transmitted power into the slit (blue line) for and . All other parameters are as in Fig. 3(a).
Absorption cross section as a function of the number of the grooves . All other parameters are as in Fig. 3(b). The insets show the spectra for , 10, and 15.
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