scholarly journals Soret Fishnet Metalens Antenna

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Bakhtiyar Orazbayev ◽  
Miguel Beruete ◽  
Víctor Pacheco-Peña ◽  
Gonzalo Crespo ◽  
Jorge Teniente ◽  
...  
Keyword(s):  
Focal Length ◽  
Low Cost ◽  
Diffractive Optical Elements ◽  
Fresnel Reflection ◽  
Radiation Characteristics ◽  
Optical Elements ◽  
Compact Antenna ◽  
Radar Systems ◽  
W Band ◽  
Low Profile

Abstract At the expense of frequency narrowing, binary amplitude-only diffractive optical elements emulate refractive lenses without the need of large profiles. Unfortunately, they also present larger Fresnel reflection loss than conventional lenses. This is usually tackled by implementing unattractive cumbersome designs. Here we demonstrate that simplicity is not at odds with performance and we show how the fishnet metamaterial can improve the radiation pattern of a Soret lens. The building block of this advanced Soret lens is the fishnet metamaterial operating in the near-zero refractive index regime with one of the edge layers designed with alternating opaque and transparent concentric rings made of subwavelength holes. The hybrid Soret fishnet metalens retains all the merits of classical Soret lenses such as low profile, low cost and ease of manufacturing. It is designed for the W-band of the millimeter-waves range with a subwavelength focal length FL = 1.58 mm (0.5λ0) aiming at a compact antenna or radar systems. The focal properties of the lens along with its radiation characteristics in a lens antenna configuration have been studied numerically and confirmed experimentally, showing a gain improvement of ~2 dB with respect to a fishnet Soret lens without the fishnet metamaterial.

scholarly journals Compact Enhanced CPW-Fed Antenna for UWB Applications

2021 ◽  
Vol 10 (1) ◽  
pp. 15-20
Author(s):  
H. Abdi ◽  
J. Nourinia ◽  
C. Ghobadi
Keyword(s):  
Low Cost ◽  
Impedance Matching ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Compact Antenna ◽  
Low Profile ◽  
Rectangular Slit ◽  
Operating Bandwidth ◽  
Uwb Applications ◽  
Operational Range

This paper presents a compact antenna with co-planar waveguide (CPW) feed line for ultra-wideband (UWB) applications. The proposed antenna consists of a beveled radiating patch with wide rectangular slit at its upper side and a partial ground plane with insertion of symmetrically two-step beveled tapers at its center and sides, which provides a wide operating bandwidth. The antenna is integrated with narrow rectangular-shaped parasitic elements with different lengths placed adjacent to radiant patch to significantly enhance the impedance matching and bandwidth, especially at the upper frequencies. The measured results show an |S11| less than -10 dB bandwidth of 2.5-19.8 GHz with 155% fractional bandwidth. Simulation results are in good agreement with experimental measurements, which exhibits the validity of the proposed design approach. Moreover, the proposed CPW-fed antenna shows omnidirectional radiation patterns with stable gain within the operational range. The proposed compact antenna with low profile, light weight, large frequency bandwidth, ease of fabrication and low cost material is suitable for UWB applications.

scholarly journals Design of a Compact Solar Cell Meshed Antenna for WLAN/WIMAX Application

2021 ◽  
Vol 10 (1) ◽  
pp. 46-51
Author(s):  
C. Baccouch ◽  
C. Bahar ◽  
H. Sakli ◽  
T. Aguili
Keyword(s):  
Solar Cell ◽  
Patch Antenna ◽  
Low Cost ◽  
Electrical Power ◽  
Photovoltaic Cell ◽  
Radiation Characteristics ◽  
Microstrip Patch ◽  
System A ◽  
Radiated Power ◽  
Low Profile

Patch antenna is a low-profile antenna that has a number of advantages, low cost, light weight,easy to feed and their attractive radiation characteristics. For aWiMAX communication system, a microstrip patch antenna which operates at 2.76 GHz frequency band was presented in this work. The hybrid system solar cell antenna allows energy recovery as well as RF Transmission. A simulation process, withMATLAB, is used to determine the electrical power collected by the studied system as a photovoltaic cell. As a antenna, parameters such as gain, directivity, radiation pattern and radiated power were studied. Simulation results, showed a resonance frequency of the antenna at 2.76 GHz with an effective return loss of -18.64dB and a gain of 6.58dBi. Thereafter, an optical rectenna based on a solar cell antenna was proposed and studied.

Limit Of Phase Only Approach In Micro–Lens Design

2012 ◽  
Author(s):  
Ali Jebelli ◽  
Ruzairi Abdul Rahim ◽  
Seyed H. Kazemi
Keyword(s):  
Focal Length ◽  
Fdtd Method ◽  
Absorbing Boundary Conditions ◽  
Lens Design ◽  
Diffractive Optical Elements ◽  
Absorbing Boundary ◽  
Optical Elements ◽  
Perfect Matched Layer ◽  
Difference Time ◽  
Micro Lens

Phase only approach (POA) is generally used to analyze diffractive optical elements (DOEs) such as micro–lenses. We used 3–D finite difference time domain (FDTD) method with perfect matched layer (PML) absorbing boundary conditions to test several micro–lenses that were designed based on phase only approach to evaluate the accuracy of this approach. It is shown that if the focal length is greater than 80λ and 25λ for 2π and 4π phase resets, respectively, the error in the main lobe diffraction efficiency will be less than 10%. Key words: Phase only approach (POA); diffractive optical elements (DOEs); micro–lens

scholarly journals Roller nanoimprint lithography for low-cost nanoscale random lattice diffractive optical elements

AIP Advances ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 035221
Author(s):  
Man Zhang ◽  
Liang-ping Xia ◽  
Sui-hu Dang ◽  
A-xiu Cao ◽  
Li-fang Shi ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Low Cost ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Random Lattice

High quality diffractive optical elements (DOEs) using SMILE imprint technique

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Drieschner ◽  
Fabian Kloiber ◽  
Marc Hennemeyer ◽  
Jan J. Klein ◽  
Manuel W. Thesen
Keyword(s):  
Soft Lithography ◽  
High Efficiency ◽  
Low Cost ◽  
Industrial Applications ◽  
Diffractive Optical Elements ◽  
Large Area ◽  
High Quality ◽  
Optical Elements ◽  
Uv Curable ◽  
Aspect Ratios

Abstract Augmented reality (AR) enhancing the existing natural environment by overlaying a virtual world is an emerging and growing market and attracts huge commercial interest into optical devices which can be implemented into head-mounted AR equipment. Diffractive optical elements (DOEs) are considered as the most promising candidate to meet the market’s requirements such as compactness, low-cost, and reliability. Hence, they allow building alternatives to large display headsets for virtual reality (VR) by lightweight glasses. Soft lithography replication offers a pathway to the fabrication of large area DOEs with high aspect ratios, multilevel features, and critical dimensions below the diffractive optical limit down to 50 nm also in the scope of mass manufacturing. In combination with tailored UV-curable photopolymers, the fabrication time can be drastically reduced making it very appealing to industrial applications. Here, we illustrate the key features of high efficiency DOEs and how the SMILE (SUSS MicroTec Imprint Lithography Equipment) technique can be used with advanced imprint photopolymers to obtain high quality binary DOEs meeting the market’s requirements providing a very versatile tool to imprint both nano- and microstructures.

Laser Power Characterization Method for Fabrication of Centrosymmetric CR-DOEs Mask

2008 ◽  
Vol 53-54 ◽  
pp. 337-342
Author(s):  
Duo Shu Wang ◽  
Chong Tai Luo ◽  
Tao Chen ◽  
Yu Qing Xiong ◽  
Hong Kai Liu ◽  
...  
Keyword(s):  
Laser Power ◽  
Low Cost ◽  
Chromatic Aberration ◽  
Diffractive Optical Elements ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Optical Elements ◽  
Short Period ◽  
Diffractive Efficiency ◽  
Mask Fabrication

With high diffractive efficiency, Continuous Relief Diffractive Optical Elements (CR-DOE) can be used to eliminate chromatic aberration, partial aberration and simplify optical system. The technology for CR-DOE with Laser Direct Writing method has advantages of simple process, short period and low cost. The paper studied on the characterization method of laser power for the technology. The principle of mask fabrication of CR-DOE by Laser Direct Writing is described in the paper. The relations between microstructure depth and laser power, exposing position radius and laser power were studied. The results showed that microstructure depth changes in direct ratio to laser power and laser power should change in direct to exposing position radius while several same depth microstructures were fabricated at different radius. At the end, the paper gave the charactering method and also fabricated the mask of a kind of centrosymmetric continuous relief diffractive focus lens with the method.

Manufacturing of Glass Diffractive Optical Elements by Use of Precision Compression Molding Process

2007 ◽  
Author(s):  
Yang Chen ◽  
Allen Y. Yi ◽  
Fritz Klocke ◽  
Guido Pongs
Keyword(s):  
Glassy Carbon ◽  
Optical Glass ◽  
Low Cost ◽  
High Volume ◽  
Compression Molding ◽  
Diffractive Optical Elements ◽  
Molding Process ◽  
Optical Elements ◽  
Atomic Force ◽  
Optical Profilometer

Recent advances in compression molding process offer a potential high volume precision net shape fabrication method for micro and diffractive glass optical elements. In this research, glass diffractive optical elements with lateral features in the order of 2 μm and a vertical height of about 500 nm were fabricated using glassy carbon molds and BK-7 optical glass material. Glassy carbon molds used in this research were fabricated with traditional cleanroom lithography and reactive ion etching process. Compression mold process was performed to duplicate the diffractive structures onto optical glass surface. Molded glass diffractive elements were studied using an atomic force microscope and a Veeco optical profilometer to evaluate the accuracy of replication and the capacity of the molding process. Different molding process parameters were tested to improve the molding process. The experimental results showed that the compression molding process is an effective alternative fabricating method for high volume, net shape and low cost glass diffractive optical elements.

scholarly journals Traceability of high focal length cameras with diffractive optical elements

2016 ◽  
Vol 772 ◽  
pp. 012005
Author(s):  
L Lages Martins ◽  
A Silva Ribeiro ◽  
J Alves e Sousa
Keyword(s):  
Focal Length ◽  
Diffractive Optical Elements ◽  
Optical Elements
Sign in / Sign up

Export Citation Format

Share Document