Abstract
The inverse opal structures present very good mechanical and optical properties, like high mechanical strength and Young modulus, important photoluminescence and stimulated Brillouin scattering. Enhancement of the optical properties of the metamaterials based on different types of inverse opal can be obtained by controlling the stopband of the 3D periodic structure. SiO2, TiO2 and CeO2 photonic crystals with inverse opal structures have been studied, presenting voids of 100 – 280 nm. The stopband dependence on the physical and geometrical parameters of the matrix has been analyzed (ions nature, voids diameter, photoelastic constant). The study was performed by structural simulation methods, using the HFSS program. The test configuration was set for the visible light domain. The effective refraction index n and the stimulated Brillouin scattering coefficient gP have been determined and represented on parametrical graphs. Results were compared with the theoretic calculated values. By varying different structural parameters and the stopband control, superior values of the optical parameters have been obtained, in comparison with the data given in literature. We report an increasing of the photoluminescence with about 7%, respectively and enhancement of the stimulated Brillouin scattering coefficient of 11 % when parameters are correlated.
Highlights
Inverse opal metamaterialsThe inverse opal structures were demonstrated to present very good mechanical and optical properties, like high mechanical strength and Young modulus, important photoluminescence and stimulated Brillouin scattering
The inverse opal structures present very good mechanical and optical properties, like high mechanical strength and Young modulus, important photoluminescence and stimulated Brillouin scattering
The study was performed by structural simulation methods, using the HFSS program
Summary
The inverse opal structures were demonstrated to present very good mechanical and optical properties, like high mechanical strength and Young modulus, important photoluminescence and stimulated Brillouin scattering Due to their property of periodic modulation of the refraction index onside the material, the photonic crystals based on inverse opals are used for multiple applications. The stopband or pseudo gap represents an incomplete photonic band gap, characteristic of this type of materials, where the light propagates in only some directions These properties of prohibiting the electromagnetic wave propagation depend on the refraction index contrast and the lattice topology. Our simulation methods have the purpose to correlate these internal and external parameters in order to obtain a stopband control and an improving of the electro-optical properties of the metamaterial samples
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