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Abstract
We propose an all-solid-state tunable Bragg filter with a phase transition material as the defect layer. Bragg filters based on a vanadium dioxide defect layer sandwiched between silicon dioxide/titanium dioxide Bragg gratings are experimentally demonstrated. Temperature dependent reflection spectroscopy shows the dynamic tunability and hysteresis properties of the Bragg filter. Temperature dependent Raman spectroscopy reveals the connection between the tunability and the phase transition of the vanadium dioxide defect layer. This work paves a new avenue in tunable Bragg filter designs and promises more applications by combining phase transition materials and optical cavities.
Highlights
Bragg gratings, as famous one-dimensional photonic crystals, are formed by alternating dielectric layers with different refractive indices [1, 2]
We propose an all-solid-state tunable Bragg filter with a phase transition material as the defect layer
Bragg filters based on a vanadium dioxide defect layer sandwiched between silicon dioxide/titanium dioxide Bragg gratings are experimentally demonstrated
Summary
As famous one-dimensional photonic crystals, are formed by alternating dielectric layers with different refractive indices [1, 2]. Though known as metallic phase at high temperature, in the wavelength region between 500 nm and 1000 nm, the optical properties of VO2 stay as dielectric (real part of relative permittivity > 0) under both phases, but with dramatic difference. Considering dispersion in the wavelength region from 500 to 1000 nm, the complex refractive index of VO2 varies from 3.6+0.6i to 3.0+0.5i at room temperature, and from 3+0.8i to 1.5+1.4i at high temperature (around 80 °C) This confirms VO2 to be a good candidate of a tunable defect layer. The intrinsic phase transition properties of VO2 are preserved after the VO2 layer is encapsulated between two Bragg gratings This promises more potential applications by combining phase transition materials with optical cavities
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