A four channel photonic crystal filter is designed using 2-D photonic crystal.The condition of achieving 100% channel coupling is educed using CMT(coupling mode theory).Four-channel filter is designed based on the condition,and results are simulated using FDTD(finite difference time domain).The coupling efficiency of every channel is higher than 96% from simulation results.Frequency of the four-channel is from 1520 nm to 1 580 nm when lattice constant is 570 nm,and interval of every channel is less than 20 nm.The crosstalk interference of every channel is very small.

The optical propagation property of a planar waveguide with a periodic nanoparticle grating layer is characterized by using sliding prism method. Here, Cu nanoparticle grating was fabricated on a-SiO2 substrate by periodic heavy-ion irradiation technique. The pitch of these gratings was 2 μm and 3 μm, respectively. The flux and fluence were at the range of 6–10 μA/cm2 and 6 × 1016–1 × 1017 ions/cm2, respectively. The grating effect, mainly including the mode selection effect, is observed. The effect depends on the pitch of the grating and the morphology of nanoparticles. The propagation loss of the waveguide induced by nanoparticle layer is evaluated.

A four channel photonic crystals filter is designed using 2-D photonic crystals. First, General conditions for obtaining 100% drop efficiency are derived in a three-port channel drop filter. Based on this modeling, a photonic crystal-based four-channel drop filter is design. The performance of filter is simulation using 2D FDTD (finite difference time domain) method. The coupling efficiency of every channel is higher than 90% from seeing the simulation results. The frequency of the four-channel is from 1530nm to 1580nm when the lattice constant is 550nm, and the interval of every channel is less than 20nm. The interference of every channel is very small. The design method giving a good theory for design and made multi-channel photonic crystals filter.

A method bases on beam propagation method and image processing is brought forward to reconstruct the extraordinary refractive index profile of the ion-implanted single-mode channel waveguide in lithium niobate. Channel waveguide is formed by O 2+ ion implantation at three energies of (3.0, 3.6 and 4.5 MeV) and respective doses of (1.8, 2.2 and 4.8) × 10 14 ions/cm 2 in vacuum at room temperature. Only one enhanced-index mode is observed for extraordinary light at 1539 nm by prism-coupling method. TRIM’98 code is used to simulate the damage profile in channel waveguide. The modes pattern of TE and TM are measured by use of end-face coupling method.

Based on the analysis method of the light propagation in isotropic absorption media, the vector propagation constant is introduced and the light propagation in the biaxial absorption crystal is analyzed. The representations of some important physical parameters are derived, which was used to describe the crystal property and light propagation property, such as angle of refraction, refractive index, absorption coefficient. The corresponding results of transparent crystal can be deduced from these representations. When the crystal is absorptive, the reflection and transmission coefficients derived from the vector propagation constant method are in concordance with the results of complex refractive index method. So these two methods are uniform in some aspects, but the method of vector propagation constant is more convenient and available.

Optical properties of Au nanoparticle composites and a grid structure of Cu nanoparticle composite were studied. Negative ion implantation was applied to synthesize Au and Cu nanoparticles in amorphous SiO 2 and Al 2 O 3 . Au nanoparticles were embedded within a depth of 30 nm by 60keV Au − implantation. The surface plasmon resonance (SPR) of Au:SiO 2 and Au: Al 2 O 3 composites shifted to red and to blue, respectively, compared to calculated ones by the Mie theory. Optical nonlinearity was measured with pump-probe femtosecond spectroscopy and the transient spectrum of Au: Al 2 O 3 composite presented a large red shift from the SPR peak. Image mapping of far-field transmitted intensity of Cu-implanted SiO 2 with a fine grid structure drawn by laser-lithography was observed by a scanning near-field optical microscopy (SNOM) system.