Design of tunable left-handed material composed of ferrite-dielectric and metallic mesh

2009 ◽  
Author(s):  
Guanghua He ◽  
Rui-xin Wu ◽  
Yin Poo ◽  
Ping Chen
Keyword(s):  
Left Handed ◽  
Metallic Mesh

Multilayered CRLH Metamaterials Using Magnetic Dipole-Like Resonant Dielectric Particles and Cut-Off TE Modes in Metallic Structures

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000076-000084
Author(s):  
Tetsuya Ueda ◽  
Yoshiaki Sato ◽  
Yuichi Kado ◽  
Tatsuo Itoh
Keyword(s):  
Uniaxial Anisotropy ◽  
Multilayered Structure ◽  
The Other ◽  
Metallic Structures ◽  
Dielectric Particles ◽  
Left Handed ◽  
Dielectric Layers ◽  
Metallic Mesh ◽  
Specific Frequency ◽  
Plane Direction

Composite right/left handed (CRLH) metamaterial structures designed based on one-dielectric-resonator (DR) scheme in an epsilon-negative host medium are discussed. The scheme is a combination of dielectric and metals, but can avoid several problems often met in the other schemes composed of all dielectric metamaterials. The structure under consideration is composed of stacked layers including TE-cut-off metallic mesh plates with holes and dielectric layers with 2-D array of DRs. A volumetric multilayered 2-D CRLH structure that is impedance-matched to free space can be designed by optimally adjusting electromagnetic couplings between neighboring dielectric layers through metallic mesh holes. In addition, the multilayered structure is promising for easy fabrication of the 3-D isotropic CRLH metamaterials, compared to the other structures reported previously. It can support balanced CRLH propagation not only in the in-plane direction, but also in the direction normal to the layers. The structure has strong uniaxial anisotropy and polarization dependence, but the dispersion diagram can have almost isotropic characteristics in a specific frequency region by appropriately designing the configuration parameters.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Left handed GDPs and students

BDJ ◽  
1995 ◽  
Vol 178 (12) ◽  
pp. 448-448 ◽  
Author(s):  
J M Brown
Keyword(s):  
Left Handed

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

Parallel Ring-Line Rat-Race Circuit with Very Loose Coupling Utilizing Composite Right-/Left-Handed Transmission Lines

2014 ◽  
Vol E97.C (10) ◽  
pp. 965-971 ◽  
Author(s):  
Tadashi KAWAI ◽  
Yuma SUMITOMO ◽  
Akira ENOKIHARA ◽  
Isao OHTA ◽  
Kei SATOH ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Loose Coupling ◽  
Left Handed ◽  
Ring Line

SPATIAL DEFICIT IN FAMILIAL LEFT-HANDED CHILDREN

1978 ◽  
Vol 46 (3) ◽  
pp. 919-922 ◽  
Author(s):  
ROBERT EME ◽  
STEPHEN STONE ◽  
ROBERT IZRAL
Keyword(s):  
Left Handed ◽  
Spatial Deficit
Sign in / Sign up

Export Citation Format

Share Document