Efficient silicon-based light sources are expected to be key devices for applications such as optical interconnection. Huge number of researches has been conducted for realizing silicon-based light sources. Most of them utilized silicon-related materials such as silicon nanostructures or germanium, not crystalline silicon, which has been considered as a poor light emitter because of its indirec...

We theoretically investigate the tuning of Photonic band gaps in one dimensional photonic crystals based on Nano composite of silver nanoparticle embedded in SiO2 by applying electric field. In addition, the tuning can be done by considering the filling fraction and the radius of the nanoparticle. The evolution of these results to provide new possibilities of designing the desired photonic crys...

Laboratory of Nanotechnologies and Optical Instrumentation (LNIO) : Relaying on the development of complementary know-hows*, the research conducted in the photonics and nanooptics group at LNIO is committed to basic research on optical properties of lowdimensional photonic materials and structures : near field characterisation (integrated waveguides, photonic crystals, VECSEL), new component de...

A manufacturing method of a photonic crystal is provided. In the method, a high-refractive-index material is conformally deposited on an exposed portion of a periodic template composed of a low-refractive-index material by an atomic layer deposition process so that a difference in refractive indices or dielectric constants between the template and adjacent air becomes greater, which makes it po...

Although light propagation in weakly modulated photonic crystals is basically similar to propagation in a diffraction grating in which conventional refractive index loses its meaning, we demonstrate that light propagation in strongly modulated two-dimensional ~2D!/3D photonic crystals becomes refractionlike in the vicinity of the photonic bandgap. Such a crystal behaves as a material having an ...

Three dimensional silica photonic crystals with the gyroid minimal surface structure have been synthesized. The butterfly Callophrys rubi was used as a biotemplate. This material represents a significant addition to the small family of synthetic bicontinuous photonic crystals.

We have microfabricated 2-D photonic bandgap structures in a thin slab of dielectric material to define reflectors and high-Q microresonators. By selectively omitting holes from the two-dimensional photonic crystal, laser cavities and optical resonator switches can be defined. We have designed this structure with a finite diffe:rence time domain (FDTD) approach, and demonstrate some promising d...

Selective thermal emission in a useful range of energies from a material operating at high temperatures is required for effective solar thermophotovoltaic energy conversion. Three-dimensional metallic photonic crystals can exhibit spectral emissivity that is modified compared with the emissivity of unstructured metals, resulting in an emission spectrum useful for solar thermophotovoltaics. Howe...

We review different routes for the generation of nanoporous metallic foams and films exhibiting well-defined pore size and short-range order. Dealloying and templating allows the generation of both 2D and 3D structures that promise a plasmonic response determined by material constituents and porosity. Viewed in the context of metamaterials, the ease of fabrication of samples covering macroscopi...