We report on a distributed Bragg reflector (DBR) operating in the IR spectral region, based on a fluorocarbon polymer (CFx) multilayer. In this organic structure, the periodic variation of the refractive index is obtained by embedding gold clusters in the CFx, resulting in a periodic CFx/CFx(Au) layered structure with a refractive index discontinuity in the infrared spectral region of about Δn∼0.4. We have fabricated a quarter-wavelength stack consisting of 4 CFx/CFx(Au) pairs, with a nominal Au concentration equal to 17%. The DBR shows a reflectance peak of about 70% at 1.7 μm and a full width at half maximum of about 0.4 μm.
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Convertino et al. (1999) studied this question.
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