We report on a method how quality factors of guided-mode resonances in photonic crystal slabs (PCSs) can be determined in the reciprocal space. Transmission measurements through PCSs are performed using crossed polarization filters before and after the PCS. Consequently the unwanted illumination source is suppressed and only the guided-mode resonances are revealed. This method allows for a spatially resolved quality factor determination in the reciprocal space. As an example we scan a two-dimensional PCS and visualize its inhomogeneities. Although the resonance wavelength variations were only ≈3 nm, the quality factor varies from 100 to 350.
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Nazirizadeh et al. (2008) studied this question.
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