ENHANCED TRANSMITTANCE AND RESOLUTION OF PHOTONIC CRYSTAL FLAT LENS BY SURFACE-EDGE ENGINEERING

2012 ◽  
Vol 26 (18) ◽  
pp. 1250113
Author(s):  
HAO GUO ◽  
CANCAN WANG ◽  
PEIYUAN ZHANG ◽  
HONGJUN CHEN ◽  
YUN LI ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Cross Section ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Flat Lens ◽  
Simulation Results ◽  
Difference Time ◽  
Reflection Grating ◽  
Method Show

We proposed a novel two-dimensional (2D) photonic crystal (PC) flat lens based on the surface-edge engineering of a PC slab, operating as an n = -1 superlens at λ = 1.55 μm. The cross-section at the truncated edge of the flat lens is similar to an "anti-reflection grating", which is employed to reduce the reflectivity of propagative waves. The PC flat lens with a low reflectance of 1% was realized by the proposed truncated surface-edge for an InP / InGaAsP / InP 2D PC slab. The simulation results obtained with finite-difference time-domain (FDTD) method show that a PC flat super lens with a far-field resolution of 0.41 λ and a high transmittance of 81.9% can be achieved by the engineering of the truncated surface-edge at hetero-interface.

Design and Analysis of 2D Photonic Crystal Waveguides for High Coupling Efficiency

2007 ◽  
Vol 31 ◽  
pp. 27-29
Author(s):  
Ming Wu ◽  
Hai Rong Liu ◽  
Wei Jun Tong ◽  
De Xiu Huang
Keyword(s):  
Photonic Crystal ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Dielectric Waveguide ◽  
Fdtd Method ◽  
Coupling Efficiency ◽  
Photonic Crystal Waveguide ◽  
Photonic Crystal Waveguides ◽  
Simulation Results ◽  
Difference Time

In this paper we have proposed a photonic crystal structure to enhance the coupling efficiency between photonic crystal waveguide (PCW) and the conventional dielectric waveguide. The proposed waveguide characterized with employing the taper structure and varying the holes’ radius in the taper. Two-dimensional (2D) finite-difference time-domain (FDTD) method has been used to analyze the structure. The simulation results show that the coupling efficiency can be achieved as high as 81.6% at the wavelength of 1.55um.

Characteristics of Slow Light in a Photonic Crystal Coupled-Cavity Waveguide

2014 ◽  
Vol 887-888 ◽  
pp. 437-441
Author(s):  
Chang Xin Zhang ◽  
Xing Sheng Xu ◽  
Wei Xi
Keyword(s):  
Photonic Crystal ◽  
Group Velocity ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Slow Light ◽  
Fdtd Method ◽  
Photonic Crystal Waveguide ◽  
Difference Time ◽  
Coupled Cavity ◽  
Coupled Cavity Waveguide

A two-dimensional (2D) triangular lattice photonic crystal coupled-cavity waveguide is designed and optimized. The transmission spectrum of the PC waveguide with TE polarization is calculated by using the finite-difference time-domain (FDTD) method, and the group velocity of c/131.18 at the wavelength is obtained. Through optimizing the parameters of photonic crystal waveguide, different resonance length are obtained by changing the number of the continous air holes. The smallest group velocity is obtained to be c/2209 in the coupled-cavity waveguide with 15 air holes. The mechanism of slow light in the coupled-cavity waveguide of photonic crystal is analyzed.

FDTD Modelling of Triangular Gold Nanoparticle Pairs

2014 ◽  
Vol 703 ◽  
pp. 220-223
Author(s):  
Yang Fan
Keyword(s):  
Electric Field ◽  
Gold Nanoparticle ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Plasmon Resonances ◽  
Simulation Results ◽  
Difference Time

The optical properties of triangular gold nanoparticle pairs are investigated by numerical simulations using Finite-difference time-domain (FDTD) method. The simulation results show the significant red shifts of plasmon resonances as the size of nanoparticle is increased. The large electric field enhancement is also verified by calculating the local electric field distributions.

Simulation of Broadband Transmission Photonic Crystal Waveguide Crossing with Linear Taper

2013 ◽  
Vol 479-480 ◽  
pp. 133-136
Author(s):  
Yih Bin Lin ◽  
Rei Shin Chen ◽  
Ting Chung Yu ◽  
Ju Feng Liu
Keyword(s):  
Photonic Crystal ◽  
Finite Difference ◽  
Cross Talk ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Transmission Band ◽  
Time Domain Method ◽  
Photonic Crystal Waveguide ◽  
Difference Time ◽  
Novel Design

A novel design of photonic crystal waveguide crossing with taper structure is proposed. Simulations are performed by finite-difference time-domain method. The results show the proposed design has both high transmission and low cross talk characteristics. The transmission band and low cross talk band can be tuned to match each other by adjusting the taper structure..

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