Nanofocusing enhancement in a tapered slit by using a dielectric micro isosceles triangle prism and tuning the entrance aperture

2012 ◽  
Vol 101 (3) ◽  
pp. 031101 ◽  
Author(s):  
Dengfeng Kuang ◽  
Sheng Ouyang ◽  
Zhongxun Du
Keyword(s):  
Isosceles Triangle ◽  
Entrance Aperture

scholarly journals Numerical Modeling of Photonic Jet behind Triangular Prism

2021 ◽  
pp. 1-6
Author(s):  
Arnold Abramov ◽  
Yutao Yue ◽  
Mingming Wang ◽  
Zongyang Wang ◽  
Yajun Xu
Keyword(s):  
Plane Waves ◽  
Isosceles Triangle ◽  
Triangular Prism ◽  
Jet Formation ◽  
Photonic Jet ◽  
Shadow Side ◽  
Difference Time ◽  
Electromagnetic Plane Waves ◽  
High Field Intensity ◽  
Sub Wavelength

The scattering of electromagnetic plane waves by triangular prism and its truncated form (the isosceles triangle and the trapezoid are transverse sections, respectively) has been studied in order to determine possibility of high field intensity (photonic jet) formation. Using high-resolution finite-difference time-domain simulation, an optimal relationship between the wavelength and the size of the prism was found to form photonic jet with sub wavelength waist on the shadow side of the prism. Truncation of the prism (with trapezoids as transverse sections) leads to an improvement in the characteristics of photonic jets (intensity, length and waist). A qualitative explanation of the simulation results obtained is presented.

scholarly journals Modulation instabilities in equilateral three-core optical fibers for isosceles-triangle symmetric continuous waves

2018 ◽  
Vol 67 (5) ◽  
pp. 054203
Author(s):  
Pei Shi-Xin ◽  
Xu Hui ◽  
Sun Ting-Ting ◽  
Li Jin-Hua
Keyword(s):  
Optical Fibers ◽  
Isosceles Triangle ◽  
Continuous Waves

scholarly journals Dihedral F-Tilings of the Sphere by Equilateral and Scalene Triangles - II

10.37236/815 ◽  
2008 ◽  
Vol 15 (1) ◽  
Author(s):  
A. M. d'Azevedo Breda ◽  
Patrícia S. Ribeiro ◽  
Altino F. Santos
Keyword(s):  
Equilateral Triangle ◽  
Isosceles Triangle ◽  
Subsequent Paper ◽  
Euclidean Sphere ◽  
Regular Polygons ◽  
Combinatorial Description ◽  
Equilateral Triangles

The study of dihedral f-tilings of the Euclidean sphere $S^2$ by triangles and $r$-sided regular polygons was initiated in 2004 where the case $r=4$ was considered [5]. In a subsequent paper [1], the study of all spherical f-tilings by triangles and $r$-sided regular polygons, for any $r\ge 5$, was described. Later on, in [3], the classification of all f-tilings of $S^2$ whose prototiles are an equilateral triangle and an isosceles triangle is obtained. The algebraic and combinatorial description of spherical f-tilings by equilateral triangles and scalene triangles of angles $\beta$, $\gamma$ and $\delta$ $(\beta>\gamma>\delta)$ whose edge adjacency is performed by the side opposite to $\beta$ was done in [4]. In this paper we extend these results considering the edge adjacency performed by the side opposite to $\delta$.

scholarly journals Il pentagono come strumento per il disegno delle fortezze

X ◽  
2020 ◽  
Author(s):  
Paola Magnaghi-Delfino ◽  
Giampiero Mele ◽  
Tullia Norando
Keyword(s):  
Fifteenth Century ◽  
Golden Section ◽  
Fibonacci Sequence ◽  
Isosceles Triangle ◽  
Luca Pacioli ◽  
Golden Triangle ◽  
The Military ◽  
The Relationship ◽  
Shape And Size

The pentagon as a tool for fortresses’ drawingStarting from the fifteenth century, the diagram of many fortresses has a pentagonal shape. Among the best known fortresses, in Italy we find the Fortezza da Basso of Florence, the Cittadella of Parma, the Cittadella  of Turin,  Castel Sant’Angelo in Rome. The aim of this article is to analyze the reasons that link form and geometry to the planning of the design and the layout of pentagonal fortresses. The pentagon is a polygon tied to the golden section and to the Fibonacci sequence and it is possible to construct it starting from the golden triangle and its gnomon. This construction of the pentagon is already found in the book De Divina Proportione by Luca Pacioli and is particularly convenient for planning pentagonal fortresses. If one wants to draw the first approximated golden triangle, one can just consider the numbers of the Fibonacci sequence, for example 5 and 8, which establish the relationship between the sides: 5 units is the length of the base and 8 units the length of the equal sides. In the second isosceles triangle, which is the gnomon of the first, the base is 8 units long and equal sides are 5 units long; half of this isosceles triangle is the Pythagorean triangle (3, 4, 5). This characteristic of the golden triangles, that was already known by the Pythagoreans and, in a certain sense, contained in the symbol of their School, allows to build a pentagon with only the use of the ruler and the set square. The distinctive trait of the construction just described makes preferable to use the pentagon in the layout of the military architectures in the fieldworks. We have verified the relationship between numbers, shape and size in the layout of Castel Sant’Angelo (1555-1559) in which the approximate pentagon was the instrument for the generation of its form.

Design of a Microstrip Slot Antenna Filled by an Isosceles Triangle for UWB Applications

2008 ◽  
Vol 22 (1) ◽  
pp. 111-118 ◽  
Author(s):  
A. Siahcheshm ◽  
S. Sadat ◽  
Ch. Ghobadi ◽  
J. Nourinia
Keyword(s):  
Isosceles Triangle ◽  
Slot Antenna ◽  
Uwb Applications
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