We demonstrate the fabrication, simulation, and experimental results of a buried, homogeneous narrowband spectral filter with a periodic, hexagonal unit cell of air pockets, encapsulated in a fused silica substrate. The leaky waveguide is formed by depositing ${\mathrm{SiO}}_x$ on an etched fused silica grating via plasma-enhanced chemical vapor deposition. Design principles of guided mode resonance filters were utilized to achieve a resonance with 60% reflectivity at a wavelength of $1.741\mathrm{\mu m}$ . The device demonstrates resonance with FWHM of $6\mathrm{nm}$ .

© 2011 Optical Society of America

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