scholarly journals The Influence of Structure Parameters on Nanoantennas’ Optical Response

Chemosensors ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 42
Author(s):  
Ricardo A. Marques Lameirinhas ◽  
João Paulo N. Torres ◽  
António Baptista
Keyword(s):  
Optical Response ◽  
Optical Devices ◽  
Hole Diameter ◽  
Comsol Multiphysics ◽  
Structure Parameters ◽  
Circular Holes ◽  
Response Peak ◽  
Response Dependence

Currently, huge opportunities for the inclusion of new optical devices in our lives have been appearing. There are evident and irrefutable examples for nanoantenna applications. They can be used to improve already developed devices or even be used as the device. In both cases, they can be applied in diverse areas, such as medicine, environment, energy, defense, and communications. A square arrayed metallic nanoantenna composed of circular holes is studied by performing simulations using COMSOL Multiphysics. This article aims to study the influence of the nanoantenna’s metal, silver, gold, copper and aluminum, but also the optical response dependence on the nanoantenna’s periodicity, its thickness, the hole diameter, and the number of holes. It is evidenced that the optical response can be tuned using the structure parameters and by choosing an appropriate material. This tuning will allow developers to fulfil the specifications, since it is proven that the response peak can be deliberately shifted, amplified, or attenuated.

scholarly journals A Sensor Based on Nanoantennas

2020 ◽  
Vol 10 (19) ◽  
pp. 6837
Author(s):  
Ricardo A. Marques Lameirinhas ◽  
João Paulo N. Torres ◽  
António Baptista
Keyword(s):  
Temperature Sensor ◽  
High Probability ◽  
Energy Exchange ◽  
Optical Transmission ◽  
Spectral Response ◽  
Optical Response ◽  
Hole Diameter ◽  
Parameter Analysis ◽  
Substrate Thickness ◽  
Plasmon Polaritons

At the end of the XX century, a new phenomenon was discovered by Ebbesen, the extraordinary optical transmission. He reported that metallic arrays composed of nano holes, also called nanoantennas, can support resonant optical transmissions responsible by the amplification and concentration of electromagnetic radiation. Classical diffraction theories do not predict this extraordinary phenomenon. This article shows the timeline of theories that try to model the interaction between light and metal planes with slits, holes, grooves or apertures. The comparison between theories is done. Furthermore, as the optical response of these nanoantennas is dependent on the complex dielectric function, there is a high probability of successfully using these structures as sensors. This article aimed to verify how the structure parameters (periodicity, hole diameter, nanoantenna thickness and substrate thickness) can influence the optical response in order to tune the spectrum. Using a Finite Element Tool, several 3D simulations aim to conclude about the parameters influence on air–gold–quartz and air–aluminum–quartz structures, being the nanoantenna made with gold and aluminum. Moreover, all the simulations allow us to verify a resonant spectral response and the existence of great values of amplification near the metal surface. This is a clear evidence of a energy exchange due to the generation and propagation of surface plasmon polaritons. Based on the spectra taken from the parameter analysis, a specific structure was chosen to test two different sensors. A temperature sensor and a tissue detection sensor were tested and the simulations are presented. It is concluded that a nanostructure based on a nanoantenna can be used as a sensor for several applications.

Design of Natural Gas Ejector in the Engine

2013 ◽  
Vol 321-324 ◽  
pp. 1753-1756 ◽  
Author(s):  
Ming Fei Chen ◽  
Na Wang ◽  
Jian Chun Xiao ◽  
Ke Ming Liu ◽  
Lian Yong Zhang
Keyword(s):  
Mixed State ◽  
Structural Characteristics ◽  
Hole Diameter ◽  
Structure Parameters ◽  
Ejection Time ◽  
Time Control ◽  
Cng Engine ◽  
Jet Control ◽  
Main Components ◽  
Through Hole

in order to meet the requirements of the supplying system of CNG engine to the mixed state of fuel and the ejection time control of fuel, the overall structure of CNG fuel ejector is given. The structural characteristics of the main components of the CNG ejectors are analyzed and the structure parameters which have significant effect on the performance of the ejector are designed and calculated. Through the calculation on the through-hole diameter, spring, coil and minimum wall thickness, it is indicated that the designed ejector satisfies the demand of the jet pressure and jet control.

FABRICATION AND OPTICAL PROPERTIES OF METAL-COATED NON-CLOSE-PACKED COLLOIDAL CRYSTALS

2009 ◽  
Vol 18 (04) ◽  
pp. 633-640
Author(s):  
ANNA MUSTONEN ◽  
HARRI LIPSANEN
Keyword(s):  
Optical Properties ◽  
Optical Transmission ◽  
Reactive Ion Etching ◽  
Colloidal Crystals ◽  
Nanosphere Lithography ◽  
Optical Response ◽  
Ion Etching ◽  
Circular Holes ◽  
Shell Particles

We present a study of optical transmission through metal-coated non-close-packed colloidal crystals. The arrays combine semi-shell particles and circular holes simultaneously. We show that the optical response of the structures can be tuned by altering the size of the semi-shell particles and holes. The non-close-packed colloidal crystals were fabricated using modified nanosphere lithography and reactive ion etching.

Deformation Solution in Thin Ring Plates with Circular Holes

2013 ◽  
Vol 459 ◽  
pp. 380-385
Author(s):  
Najmeddin Arab
Keyword(s):  
Deformation Process ◽  
Stress Condition ◽  
Hole Diameter ◽  
Outer Diameter ◽  
Plane Stress Condition ◽  
Ring Plate ◽  
Thin Ring ◽  
Circular Holes ◽  
Thickness Variations ◽  
Deformation Procedure

In this research, deformation process of a thin ring plate with circular hole has been analyzed. Regarding the material characteristics and forming facilities, various forming in a blank with are possible Deep drawing without variation in central hole diameter and also by variation in hole diameter and Flanging when the outer diameter of blank is constant or variable. By taking into account the thickness variations, and work hardening, the forming of thin ring plate at plane stress condition has been considered. It is shown that the deformation procedure of each point in the blank can be describe by non-linear vector function of plasticity.

Optimization of Defense Hole System for Biaxial Loaded Plate with Three Coaxial Holes

2005 ◽  
Vol 8 (2) ◽  
pp. 117-128 ◽  
Author(s):  
Montasser Tahat ◽  
Salih Akour ◽  
Saad Habali ◽  
Jamal Nayfeh
Keyword(s):  
Stress Reduction ◽  
Maximum Stress ◽  
Biaxial Loading ◽  
Hole Diameter ◽  
Optimum Shape ◽  
Element Analysis ◽  
Principal Stress Direction ◽  
Structural Part ◽  
The Finite Element Analysis ◽  
Circular Holes

Optimum design of elliptical Defense Hole System (DHS) under biaxial loading in a finite plate with a row of circular holes is presented. Maximum stress reduction is made possible by introducing elliptical auxiliary holes close to the mainmain holes in the areas of low stresses along the principal stress direction. A systematic study is undertaken by using the finite element analysis (FEA) to determine the optimum shape, location and size of the auxiliary defense hole system. These parameters are examined in relation to plate dimensions for a number of plates with different mainmain-hole-diameter to plate-width ratios and different pitch to main-hole-diameter ratios. Maximum stress reductions from 6–18% were achieved. With such reduction in the maximum stress level the improvement in fatigue life of a structural part can be very significant. The FEA results are validated experimentally by applying an enhanced RGB-photoelasticity technique. The photoelasticity experimental results and the FEA results show good agreement.

Stress-Concentration Factors Around a Central Circular Hole in a Plate Loaded Through Pin in the Hole

1940 ◽  
Vol 7 (1) ◽  
pp. A5-A9 ◽  
Author(s):  
M. M. Frocht ◽  
H. N. Hill
Keyword(s):  
Stress Concentration ◽  
Hole Diameter ◽  
Finite Width ◽  
Center Line ◽  
Strain Gages ◽  
Stress Concentrations ◽  
Circular Holes ◽  
Concentration Factors ◽  
Institute Of Technology ◽  
Stress Concentration Factors

Abstract This paper deals with factors of stress concentrations in plates of finite width with central circular holes loaded through pins or rivets. Two sets of results are presented, one from oversize aluminum specimens in which the stresses were determined from strain-gage measurements, the other, from photoelastic tests with small bakelite models. The two investigations were conceived and executed independently. The tests involving the use of strain gages were made at Aluminum Research Laboratories and the photoelastic tests were made at the Photoelastic Laboratory of the Carnegie Institute of Technology. While most of the tests involved plates loaded through a single pin in a hole on the longitudinal center line of the plate, several tests were made on plates loaded through two pins symmetrically situated about the center line of the plate. Numerical values for the stress-concentration factor k are given for ratios of hole diameter to width of plate (2r/D) ranging from 0.086 to 0.76.

Study on Composite Optics Properties of FeCl2·4H2O Crystal in Material Engineering

2012 ◽  
Vol 583 ◽  
pp. 187-190 ◽  
Author(s):  
Feng Miao ◽  
Yi Huang
Keyword(s):  
Absorption Spectra ◽  
Energy Levels ◽  
Optical Devices ◽  
Structure Parameters ◽  
Energy Matrix ◽  
Material Engineering ◽  
Allowed Transition ◽  
Forbidden Transition ◽  
The Relationship ◽  
Good Agreement

Crystal material has an important role in material engineering. FeCl2•4H2O crystal has broad prospects in composite which has been used in energy filed, water treatment field and chemstry industry. To investigate the relationship between properties and construction, absorption spectra has been researched.Considering the crystal structure parameters and average covalent factor N, the energy levels of Fe2+ in FeCl2•4H2O crystal are calculated by diagonalizing the energy matrix of d6. When the value of N is 0.9, the calculated results are in good agreement with the results of experiment. By investigating absorption spectra, the peaks at 5600 cm-1can be assigned as the splitting from1A1 to 5T2. The peak belongs to spin-forbidden transition. The peaks at 6300 cm-1 and 6600 cm-1 can be assigned as the splitting from 3T1 to 5T2 and 5E to 5T2 respectively, which belong to spin-forbidden transition and spin-allowed transition .The peak at 9100 cm-1can be assigned as the splitting from 3T2 to 5T2. The peak at 14800 cm-1 can be assigned as the splitting from 3T1 to 5T2. All results can be used for the production of optical devices.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

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