Jiaosheng Li

In conventional 1-D photonic crystals (PhCs) constructed entirely by isotropic dielectric thin films, photonic bandgaps (PBGs) exhibit strong angular dispersion. In this Letter, we report an experimental observation of a weakly angle-dispersive PBG in a hybrid 1-D PhC containing ellipse-dispersion metamaterials. As the incident angle increases from 10° to 80°, the central wavelength of the PBG slightly decreases from 1219.05 to 1102.95 nm with a relative shift of only 9.5%.

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In conventional one-dimensional (1-D) photonic crystals (PCs) consisting of isotropic dielectrics, photonic bandgaps (PBGs) substantially shift toward shorter wavelengths as incident angle increases. This strong blueshift characteristic of PBGs significantly reduces the widths of near-infrared omnidirectional photonic bandgaps (OPBGs). Recently, researchers achieved a kind of special PBG called angle-insensitive PBGs in 1-D PCs containing all-dielectric elliptical metamaterials (EMMs).