In the present paper, we have carried out analysis of asymmetric light propagation in a chirped photonic crystal (PhC) waveguide. The designed structures have hexagonal arrangement and square arrangement of Silicon (Si) rods in air substrate. Dimensions of the defect rods is tailored, so that the proposed design structure work as an optical isolator. The transmission analysis of the structure reveals that it can act as an optical diode. We have plotted the extinction ratio and transmission analysis graphs for the structure and it has been observed that maximum output is obtained for telecom wavelength of 1.55μm.
The effects of the slow-down factor on third-order nonlinear effects in silicon-on-insulator photonic crystal channel waveguides were investigated. In the slow light regime, with a group index equal to 99, these nonlinear effects are enhanced but the enhancement produced depends on the input peak power level. Simulations indicate the possibility of soliton-like propagation of 1 ps pulses at an input peak power level of 50 mW inside such a photonic crystal waveguide. The increase in the induced phase shift produced by lower group velocities can be used to decrease the size and power requirements needed to operate devices such as optical switches, logic gates, and wavelength translators.
The effects of different slow-down factors on two photon absorption and free carrier absorption in silicon-on-insulator
(SOI) photonic crystal (PhC) channel waveguides are reported in this paper. It is found that, in the slow light regime,
these nonlinear effects are enhanced, but that the enhancement produced depends on the input peak power level.
Simulations indicate the possibility of soliton-like propagation of 111 fs pulses at 1.55 μm inside such a photonic crystal
A low-loss low-velocity photonic crystal (PhC) waveguide having rectangular air holes in-filled with a liquid
crystal in Si core is proposed. The possible propagation losses due to inefficient coupling are also investigated for
proposed structure. It is found that high transmission is obtained for a broad bandwidth from the output of the finally
designed heterogeneous waveguide consisting of a slow liquid crystal infiltrated PhC waveguide surrounded by fast PhC
waveguides on both sides.
In this paper, we propose silicon-on-insulator (SOI) based Photonic Crystal waveguide with hexagonal
arrangement of elliptical air holes embedded in silicon material for slow light transmission. Delay bandwidth product
which indicates the buffering capacity is evaluated to be record high 87.41 and large bandwidth (≈ 4.4THz) below silica
light line. Within this bandwidth, group velocity dispersion is evaluated on the order of 100-102 ps2/km. Thus in the
proposed structure, light is confined horizontally by photonic band gap, vertically by total internal reflection and
longitudinally by low dispersion and low group velocity while propagating through the waveguide.
An artificial engineered structure of nano-inclusion made of metallic nano-rods embedded in a dielectric
(ε=12.96) matrix with hexagonal arrangement is proposed. New improved designed structure exhibits Negative
Refraction (NR) in visible region by using surface plasmon wave in metallo-dielectric photonic crystal operating in a
dispersion regime with anti-parallel refracted wave vector and Poynting vector. Finite Difference Time Domain (FDTD)
simulations are carried out to study the reflection and transmission properties and obtained Far-field pattern. Designed
structure gives NR with high transmission and act as a filter with a quality factor ≈ 102 with strong application potential
in nano-optics and nano-technology.
Dual Band Wavelength Demultiplexer (DBWD) is designed to separate two telecommunication wavelengths, 1.31μm
and 1.55 μm utilizing photonic crystals (PhC) in Silicon on Insulator (SOI). The waveguides formed in such PhC
structures confine light horizontally by a photonic bandgap and vertically by total internal reflection. Plane Wave
Expansion (PWE) method and Finite Difference Time Domain method are used to design and analyze the DBWD in Y
type PhC. Numerical analysis indicates that the separation of two wavelengths with enhanced extinction ratio,
transmittance and quality factor can be achieved, which confirms the superior performance of the proposed design of