scholarly journals Design of photonic crystal horn antenna for transverse electric modes

2020 ◽  
Vol 50 (3) ◽  
Author(s):  
Ehsan Beiranvand ◽  
Mohammad Danaie ◽  
Majid _Afsahi
Keyword(s):  
Photonic Crystal ◽  
Low Cost ◽  
Hexagonal Lattice ◽  
Fdtd Method ◽  
Horn Antenna ◽  
Frequency Range ◽  
Low Loss ◽  
Circular Holes ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

In this paper, by modifying defects in a photonic crystal lattice, a two-dimensional photonic crystal horn antenna is designed. The photonic crystal used for this purpose is composed of a hexagonal lattice of circular holes in a dielectric slab. The results of this paper allow us to design a photonic crystal antenna capable of separating TE and TM modes. The designed structure has a very simple design that allows low cost fabrication. The structure is numerically simulated using a finite-difference time-domain (FDTD) method. Its wide bandwidth, its low loss and the ability to transmit waves at a terahertz frequency range are the antenna’s main advantages. The return loss for the frequency range of 180 to 215 THz is from –6.63 to –28.3 dB. Moreover, a 35 THz bandwidth is obtained for this structure.

scholarly journals Fully three-dimensional analysis of a photonic crystal assisted silicon on insulator waveguide bend

2018 ◽  
Vol 32 (31) ◽  
pp. 1850344 ◽  
Author(s):  
N. Eti ◽  
Z. Çetin ◽  
H. S. Sözüer
Keyword(s):  
Photonic Crystal ◽  
Numerical Study ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Silicon On Insulator ◽  
Geometrical Parameters ◽  
Low Loss ◽  
Bending Loss ◽  
Difference Time ◽  
Waveguide Bend

A detailed numerical study of low-loss silicon on insulator (SOI) waveguide bend is presented using the fully three-dimensional (3D) finite-difference time-domain (FDTD) method. The geometrical parameters are optimized to minimize the bending loss over a range of frequencies. Transmission results for the conventional single bend and photonic crystal assisted SOI waveguide bend are compared. Calculations are performed for the transmission values of TE-like modes where the electric field is strongly transverse to the direction of propagation. The best obtained transmission is over 95% for TE-like modes.

Design and Fabrication of Novel Photonic Crystal Waveguide Consisting of Si-Ion Implanted SiO2 Layers

2010 ◽  
Vol 459 ◽  
pp. 168-172 ◽  
Author(s):  
Amarachukwu Valentine Umenyi ◽  
Masashi Honmi ◽  
Shinya Kawashiri ◽  
Teruyoshi Shinagawa ◽  
Kenta Miura ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Fdtd Method ◽  
Design Parameters ◽  
Photonic Crystal Waveguide ◽  
Atomic Force ◽  
Telecommunication Wavelength ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time ◽  
Si Ion Implantation ◽  
Ion Implanted

In this paper, we designed and fabricated two-dimensional photonic crystal (2-D PhC) consisting of the silicon ion (Si-ion) implanted silicon dioxide (SiO2) layers. The PhC design parameters based on the telecommunication wavelength (λ=1.55 µm) were obtained using finite-difference time-domain (FDTD) method. By analyzing the samples fabricated using different fabrication approach; we found a suitable fabrication method for 2-D PhCs based on the Si-ion implanted SiO2 layers. We have analyzed the fabricated sample using atomic force microscope (AFM) and annealing temperature and time were optimized in order to recover the damage done by Si-ion implantation. The implantation of Si-ion into SiO2 with the process of 2-D PhCs structure can effectively guide light inside such structure, which can easily be integrated into the existing silicon technology for directing light from one part of the chip to the other.

Terahertz Characteristics of Two Dimensional Photonic Crystal Cavity Based on 3D Finite-Difference Time-Domain Method

2012 ◽  
Vol 602-604 ◽  
pp. 809-812
Author(s):  
Wen Chao Li ◽  
Tao Tao ◽  
Yu Chao Sun
Keyword(s):  
Photonic Crystal ◽  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Hexagonal Lattice ◽  
Time Domain Method ◽  
Light Confinement ◽  
Domain Method ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

We proposed a photonic crystal(PC) cavity of hexagonal lattice with six air holes of which the radius are different from other cylinders. In the center of this structure, the cavity can be obtained and light confinement is achieved. The Figure of E vs time apparently demonstrates that the light confinement can be observed in ultrafast time. All the Figures in this paper, calculated by 3D finite-difference time-domain method, illuminate that the structure proposed is significant in the field of PC.

Design and Characterization of an Ultra Low Loss, Dispersion-Flattened Slotted Photonic Crystal Fiber for Terahertz Application

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammad Rakibul Islam ◽  
Md. Arif Hossain ◽  
Syed Iftekhar Ali ◽  
Jakeya Sultana ◽  
Md. Saiful Islam
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Confinement Loss ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Low Loss ◽  
Material Loss ◽  
Crystal Fiber

AbstractA novel photonic crystal fiber (PCF) based on TOPAS, consisting only rectangular slots is presented and analyzed in this paper. The PCF promises not only an extremely low effective material loss (EML) but also a flattened dispersion over a broad frequency range. The modal characteristics of the proposed fiber have been thoroughly investigated using finite element method. The fiber confirms a low EML of 0.009 to 0.01 cm−1 in the frequency range of 0.77–1.05 THz and a flattened dispersion of 0.22±0.01 ps/THz/cm. Besides, some other significant characteristics like birefringence, single mode operation and confinement loss have also been inspected. The simplicity of the fiber makes it easily realizable using the existing fabrication technologies. Thus it is anticipated that the new fiber has the potential to ensure polarization preserving transmission of terahertz signals and to serve as an efficient medium in the terahertz frequency range.

Low-loss, wide-angle Y splitter at ∼16-µm wavelengths built with a two-dimensional photonic crystal

2002 ◽  
Vol 27 (16) ◽  
pp. 1400 ◽  
Author(s):  
S. Y. Lin ◽  
E. Chow ◽  
J. Bur ◽  
S. G. Johnson ◽  
J. D. Joannopoulos
Keyword(s):  
Photonic Crystal ◽  
Wide Angle ◽  
Two Dimensional ◽  
Low Loss ◽  
Dimensional Photonic Crystal ◽  
Two Dimensional Photonic Crystal

Performance analysis of all optical 2 × 1 multiplexer in 2D photonic crystal structure

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asghar Askarian
Keyword(s):  
Photonic Crystal ◽  
Optical Waveguides ◽  
Hexagonal Lattice ◽  
Optical Processing ◽  
Switching Speed ◽  
Fast Switching ◽  
Nonlinear Photonic Crystal ◽  
All Optical ◽  
Difference Time ◽  
Optical Structure

Abstract In optical processing systems, multiplexer is used to design optical devices such as arithmetic logic unit (ALU) and shift register (SR). Through this paper, we investigate the application of nonlinear photonic crystal ring resonator (PhCRR) based on nonlinear Kerr effect for realizing an all optical 2 × 1 multiplexer. The structure consists of two PhCRRs and five optical waveguides using hexagonal lattice silicon (Si) rods with a background of air. Performance of all optical 2 × 1 multiplexer is replicated with the help of finite difference time domain (FDTD) procedure at a wavelength of 1571 nm, and simulations presented an ultra-compact optical structure with ultra-fast switching speed.

SECOND HARMONIC GENERATION IN TWO-DIMENSIONAL PHOTONIC CRYSTAL CONSISTING OF CENTRO-SYMMETRIC DIELECTRIC

2005 ◽  
Vol 19 (05) ◽  
pp. 869-878 ◽  
Author(s):  
JIANPING SHI ◽  
XIANZHONG CHEN ◽  
XUNAN CHEN ◽  
HANMIN YAO ◽  
GAIRONG YANG ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Photonic Crystal ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Finite Difference Time Domain ◽  
Second Harmonic ◽  
Electric Quadrupole ◽  
Waveguide Length ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

We report optical second harmonic generation (OSHG) in a two dimension photonic crystal of centro-symmetric dielectric based on finite difference time domain (FDTD) algorithm. The electromagnetic field distribution in the structure and the intensity of second harmonic (SH) from electric quadrupole polarization along the waveguide are analyzed. The results show that the acute spatial variation of electromagnetic field results in the radiation of SH, and the intensity is proportional to the square of waveguide length. When the beam intensity of the pumping wave is 1.3 MW/mm2, which has wavelength of 10.6 μm, the conversion efficiency of power is 0.307% for a photonic crystal of Silicon with a length of 40 μm.

Design and optimization of two dimensional photonic crystal based optical filter

2015 ◽  
Vol 24 (03) ◽  
pp. 1550027 ◽  
Author(s):  
G. Rajalakshmi ◽  
A. Sivanantha Raja ◽  
D. Shanmuga Sundar
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Transmission Spectrum ◽  
Filter Design ◽  
Photonic Band Gap ◽  
Fdtd Method ◽  
Optical Filter ◽  
Two Dimensional ◽  
Dimensional Photonic Crystal ◽  
Two Dimensional Photonic Crystal

In this paper, the channel drop filter based on two dimensional photonic crystal is proposed. The structure is made of silicon rods with the refractive index n1 = 3.4641 which are perforated in air with refractive index n2 = 1. The simulation results are obtained using 2D finite difference time domain (FDTD) method. The photonic band gap is calculated by plane wave expansion solver method. Resonant mode of the ring resonator and the filter transmission spectrum is calculated using 2D FDTD method. Full width half maximum (FWHM) bandwidth of the filter at the output transmission spectrum from 1.508 μm to 1.512 μm is 4 nm. The quality factor of the filter is 377.5 and the proposed filter design is around 21 × 15 μm which is suitable for photonic integrated circuits.

Effect of Metal Intercalating on Transmission Characteristics of One-Dimensional Photonic Crystal

2011 ◽  
Vol 418-420 ◽  
pp. 679-683
Author(s):  
Bei Jia He ◽  
Xin Yi Chen ◽  
Jian Bo Wang ◽  
Jun Lu ◽  
Jian Chang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Plasma Frequency ◽  
Fdtd Method ◽  
Transmission Characteristics ◽  
Material Characteristic ◽  
One Dimensional ◽  
Dimensional Photonic Crystal ◽  
Simulation Results ◽  
The One ◽  
Difference Time

To expand the bandgap's width of the one-dimensional photonic crystal, a crystal named SiO2/Metal/MgF2 is formed by joining some metals into the crystal SiO2/MgF2. Furthermore the Finite Difference Time Domain (FDTD) method is used to explore the metals' influence on the crystal's transmission characteristics. The simulation results show that the metals joined could expand the width of the one-dimensional photonic crystal's bandgap effectively and the bandgap's width increases when the metals' thickness increases. Meanwhile the bandgap's characteristic is affected by the metals' material-characteristic. The higher the plasma frequency is, the wider the bandgap's width will be and the more the number of the bandgaps will be. On the other hand, the metals' damping frequency has no significant effect on the bandgap, but would make the bandgap-edge's transmittance decrease slightly.

Mid-infrared high birefringence As2Se3-based PCF with large nonlinearity and distinctive dispersion by using asymmetric elliptical air hole cladding

2018 ◽  
Vol 32 (03) ◽  
pp. 1850023 ◽  
Author(s):  
Zhanqiang Hui ◽  
Min Yang ◽  
Youkun Zhang ◽  
Meizhi Zhang
Keyword(s):  
Hexagonal Lattice ◽  
Fdtd Method ◽  
Polarization Mode Dispersion ◽  
Infrared Range ◽  
Polarization Direction ◽  
Mid Infrared ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Mode Dispersion ◽  
Difference Time

A novel high birefringence As2Se3-based hexagonal lattice photonic crystal fiber (PCF) is proposed. In the structure, a central defect core and three kinds of elliptical air holes with different major axes length and ellipticity are introduced in the cladding. The finite difference time domain (FDTD) method with perfectly matched layer (PML) absorption boundary conditions are used to simulate the guided modes of the designed PCF. The properties of this PCF are investigated in detail including the birefringence, beat length, dispersion, nonlinearity and polarization mode dispersion in the 2–5 [Formula: see text] mid-infrared range. The results show that for the optimized structure parameters of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], the high birefringence of 0.1192 and beat length of 41.93 [Formula: see text] are obtained. The maximum nonlinearity coefficient of 10,050 w[Formula: see text]km[Formula: see text] and 15,200 w[Formula: see text]km[Formula: see text] for x- and y-polarization modes are achieved. The distinctive dispersion is analyzed, which is all-normal in x-polarization direction while it has two zero dispersion points at 3.18 [Formula: see text] and 3.65 [Formula: see text] in y-polarization direction. The designed PCF with high birefringence, large nonlinearity and distinctive dispersion will be beneficial for mid-infrared fiber sensing, mid-infrared spectroscopy and nonlinear optics applications.

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