Abstract
Ferroelectric oxides are kinds of materials for construction of tunable photonic crystals with remarkable electro-optical properties. However, it is a challenge to prepare high quality dielectric mirrors consisting of ferroelectric and dielectric materials. Herein, we report a simple and inexpensive PVP-based sol–gel technique for fabricating crack-free Al2O3/PbZr0.4Ti0.6O3 (PZT) Bragg reflectors. A high-reflection band with a 200-nm bandwidth and an average optical reflectivity of more than 75% is achieved by a periodic stack of only four Al2O3/PZT bilayers, making the multilayer structure potentially applicable in tunable dielectric mirrors, optical cavities, and selective filters.
Highlights
A dielectric reflector is an artificial structure with a onedimensional periodic arrangement of two dielectric materials, which is widely used in fields of light detection, light conversion, photon manipulation, sensing, radiation cooling, etc
Ferroelectric compounds and liquid crystals are usually considered as ideal materials for the construction of photonic crystals with dynamically tunable properties due to their high transparency, large refractive index values, notable electro-optical effect, and so on
In order to obtain a dielectric reflector with wide reflection band and high reflectivity, the refractive index difference between the two materials should be as large as possible
Summary
A dielectric reflector is an artificial structure with a onedimensional periodic arrangement of two dielectric materials, which is widely used in fields of light detection, light conversion, photon manipulation, sensing, radiation cooling, etc.1–9 Recently, photonic components with dynamically tunable characteristic parameters have attracted more and more attention.10–15 Ferroelectric compounds and liquid crystals are usually considered as ideal materials for the construction of photonic crystals with dynamically tunable properties due to their high transparency, large refractive index values, notable electro-optical effect, and so on.16–19. In order to obtain a dielectric reflector with wide reflection band and high reflectivity, the refractive index difference between the two materials should be as large as possible.20,21 Most ferroelectric oxides have similar values of refractive indices in the frequency range from far-infrared to visible.
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