Historically the 1D photonic crystal has been known as the Bragg reflector or mirror, a periodic structure composed of two alternating layers of thickness t=\lambda/4n, where n is the refractive index of the layer and lambda is the free space wavelength for which optimal reflection has been designed.[Y. Yi, http://photonics.mit.edu/Photonic_Crystals.html%5D
A popular example of a photonic crystal device is the photonic crystal fiber, successfully demonstrated by Fink, Joannopoulos et al. at MIT. The ‘Omni guide’ fibre were fabricated using a bilayer (polymer and AsSe glass).[Nature 420, 650-653 (12 December 2002)]
The first demonstration of a photonic crystal waveguide, a planar-processed version of this device, developed by the EMAT group (see in figure). Comprised of a conformal cladded 1D Si/Si3N4photonic crystal; the waveguide core is a defect layer of SiO2.[Y.Yi]
Also, other groups (http://www.4spepro.org/view.php?article=002597-2010-02-05) demonstrated the fabrication of Bragg layer waveguide in polymer.
The future challenge will be demonstration of Bragg-layer fibres in all-glasses.
Optics 