Large-Area Sub-Wavelength Optical Patterning via Long-Range Ordered Polymer Lens Array

2016 ◽  
Vol 8 (25) ◽  
pp. 16368-16378 ◽  
Author(s):  
Jin Wu ◽  
Chihao Liow ◽  
Kai Tao ◽  
Yuanyuan Guo ◽  
Xiaotian Wang ◽  
...  
Keyword(s):  
Long Range ◽  
Large Area ◽  
Lens Array ◽  
Optical Patterning ◽  
Sub Wavelength

scholarly journals A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 776
Author(s):  
Jinshuang Wu ◽  
Leimengting Zhang ◽  
Yahong Li ◽  
Yixin Zhang ◽  
Bowei Yang ◽  
...  
Keyword(s):  
Circular Hole ◽  
Focal Length ◽  
Surface Film ◽  
Subwavelength Structures ◽  
Lens Array ◽  
Direct Laser ◽  
Short Focal Length ◽  
Micro Lens Array ◽  
Micro Lens ◽  
Sub Wavelength

Using the fact that a sub-wavelength structure exhibits the same thermal expansion coefficient as a micro-lens array, we design a micro-lens super-surface film with regular circular hole-like subwavelength structures to realize the high performances of central highly focusing strength and short focal length. In addition, based on the Fresnel—Kirchhoff diffraction theory, the influences of subwavelength structural period and height on the focusing performance of a micro-lens are analyzed. Furthermore, the finite-difference time-domain method is utilized to optimize the structural parameters. Via direct laser writing and an inductively coupled plasma process, we fabricated a square micro-lens array consisting of a 1000 × 1000 micro-lens unit with a sub-wavelength structure, and the optical focusing performance was measured in the visible light band. Finally, the experimental results indicate that the focal length is decreased to 15 μm, the focal spot central energy is increased by 7.3%, and the light transmission, enhanced via inserting sub-wavelength structures, corresponds to 3%. This proves that the designed micro-lens array with a regular-graded circular hole-like subwavelength structure can achieve central high focusing and a short focal length. This has applications in several fields of wavefront detection and light field imaging systems.

Sub-Wavelength Texturing for Solar Cells Using Interferometric Lithography

2006 ◽  
Vol 51 ◽  
pp. 115-120 ◽  
Author(s):  
W.L. Chiu ◽  
M.M. Alkaisi ◽  
G. Kumaravelu ◽  
R.J. Blaikie ◽  
R.J. Reeves ◽  
...  
Keyword(s):  
Defect Density ◽  
Substantial Reduction ◽  
Surface Texturing ◽  
Silicon Substrates ◽  
Textured Surface ◽  
Large Area ◽  
Periodic Patterns ◽  
Interferometric Lithography ◽  
Plasma Reflection ◽  
Sub Wavelength

We have employed Interferometric Lithography (IL) for sub-wavelength surface texturing on large area silicon substrates. Low defect density Reactive Ion Etching (RIE) processes have been developed to transfer the pattern into the silicon using SF 6 plasma. Reflection measurements on the sub-wavelength textured surface have been carried out and show a substantial reduction from ~30% to below 4% over the spectrum range from 400nm to 1200nm. IL is a mask-less lithography technique which is used to define periodic patterns. The theoretical limit of the pitch size of the structure is half of the wavelength of the light source. Hence, the sub-wavelength patterns can be achieved easily. Moreover, sub-wavelength texturing requires short RIE processes; most of the plasma-induced damage on the silicon surface can be avoided.

scholarly journals Cellular Simulation for Distributed Sensing over Complex Terrains

2018 ◽  
Author(s):  
Tuyen Truong ◽  
Bernard Pottier ◽  
Hiep Huynh
Keyword(s):  
Long Range ◽  
Graphics Processing Units ◽  
High Performance ◽  
Physical Phenomenon ◽  
Cellular Systems ◽  
Large Area ◽  
Simulation Techniques ◽  
And Performance ◽  
Application Fields ◽  
Physical Phenomena

Long-range radio transmissions open new sensor application fields, in particular for environment monitoring. As an example, the {\sl LoRa} radio protocol enables to connect remote sensors at distance as long as ten kilometers in line-of-sight. However, the large area covered also bring several difficulties, such as the placement of sensing devices in regard to geography topology, or the variability of communication latency. Sensing the environment also carries constraints related to the interest of sensing points in relation with a physical phenomenon. Criteria for designs are thus evolving a lot from the existing methods, especially in complex terrains. This article describes simulation techniques based on geography analysis to compute long-range radio coverages and radio characteristics in these situations. As radio propagation is just a particular case of physical phenomena, it is shown how a unified approach also allows to characterize the behavior of potential physical risks. The case of heavy rainfall and flooding is investigated. Geography analysis is achieved using segmentation tools to produce cellular systems which are in turn translated into code for high-performance computations. The paper provides results from practical complex terrain experiments using LoRa, that confirm the accuracy of the simulation, scheduling characteristics for sample networks, and performance tables for simulations on middle range Graphics Processing Units (GPUs).

scholarly journals Large area imaging detector for long-range, passive detection of fissile material

2004 ◽  
Vol 51 (5) ◽  
pp. 2238-2244 ◽  
Author(s):  
K.P. Ziock ◽  
W.W. Craig ◽  
L. Fabris ◽  
R.C. Lanza ◽  
S. Gallagher ◽  
...  
Keyword(s):  
Long Range ◽  
Fissile Material ◽  
Large Area ◽  
Passive Detection ◽  
Imaging Detector

scholarly journals Addressing Spatial Variability of Surface-Layer Wind with Long-Range WindScanners

2015 ◽  
Vol 32 (3) ◽  
pp. 518-527 ◽  
Author(s):  
Jacob Berg ◽  
Nikola Vasiljevíc ◽  
Mark Kelly ◽  
Guillaume Lea ◽  
Michael Courtney
Keyword(s):  
Spatial Variability ◽  
Long Range ◽  
Three Dimensional ◽  
Proof Of Concept ◽  
Large Area ◽  
Vertical Velocity Component ◽  
Sonic Anemometers ◽  
Wind Measurements ◽  
The Mean

AbstractThis paper presents an analysis of mean wind measurements from a coordinated system of long-range WindScanners. From individual scan patterns the mean wind field was reconstructed over a large area, and hence it highlights the spatial variability. From comparison with sonic anemometers, the quality of the WindScanner data is high, although the fidelity of the estimated vertical velocity component is significantly limited by the elevation angles of the scanner heads. The system of long-range WindScanners presented in this paper is close to being fully operational, with the pilot study herein serving not only as a proof of concept but also verifying expectations of reliable wind measurements over arbitrary three-dimensional volumes, in future sustained meteorological campaigns.

A hybrid long-range plasmonic waveguide with sub-wavelength confinement

2013 ◽  
Vol 291 ◽  
pp. 400-404 ◽  
Author(s):  
Lin Chen ◽  
Xun Li ◽  
Guoping Wang
Keyword(s):  
Long Range ◽  
Plasmonic Waveguide ◽  
Sub Wavelength
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