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Transmission characteristics of photonic crystal (PhC)-slab-type guided mode resonance (GMR) filters in the infrared range (4-10 mum) are studied numerically and experimentally. Using a finite-difference time-domain method, the dependencies of the spectral response with the depth and size of holes are investigated and analyzed. The GMR filters were fabricated on a silicon-on-insulator wafer and the experimental transmission spectra were compared with the simulations. In this context, we identified a list of conditions for the realization of PhC-slab-type GMR filters in the infrared range.