We report the measurement of a polarization-independent guided-mode resonant filter with a Q factor of $\sim 2200$ functioning near normal incidence in the near infrared $\left(850\mathrm{nm}\right)$ . Besides this remarkable performance, we provide a detailed optical and structural characterization of the component, which points out the origins of the limitation of the experimental performance. We conclude that the defaults in question can be corrected by improving the lithography process, and we are confident that even greater performance will be obtained in future realizations.

© 2010 Optical Society of America

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