Mid- and far-infrared optical characterization of monoclinic HfO2 nanoparticles and evidence of localized surface phonon polaritons
نویسندگان
چکیده
Monoclinic HfO2 nanoparticles (9 45 nm) are synthesized using a sol-gel method and optically characterized using transmissionand angle-dependent reflection spectroscopy in the midto far-infrared. A detailed HfO2 identification of the infrared-active phonon modes is presented; consistent with previously reported thin film values, and in excellent agreement with density functional perturbation theory calculations. An anomaly is observed in both reflection and transmission measurements, at 556 cm that is not attributed to the optical phonon modes. Numerical models indicate that this measured anomaly is in the spectral region of a localized surface phonon polariton mode. The results of this work suggest that HfO2 nanoparticles could enable new midand far-infrared materials and devices with engineered optical properties.
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