scholarly journals Simulation of a Gan-Based Optical Diode with Sapphire Sub-Layer Which is Shaped Patterned Hemisphere, using Poynting Vector Analysis

2018 ◽  
Vol 15 (2) ◽  
pp. 317-325
Author(s):  
Marjan Abbasi
Keyword(s):  
Data Analysis ◽  
High Efficiency ◽  
Poynting Vector ◽  
Diode Lasers ◽  
Optical Devices ◽  
Vector Analysis ◽  
Light Reflection ◽  
Transmission Angle ◽  
Light Efficiency ◽  
Optical Diode

Creating light source has always been an interesting matter in the field of optical devices. One of the activities in this field is the effort to build optical diodes and High-efficiency lasers. The aim of this study was to use GaN-based diode lasers with Shaped patterned hemisphere algorithm using Poynting vector analysis can cause modification in output light efficiency. In this article we get to know with time-based finite difference method as one of the analyzing and electromagnetic equations solving and also check out parsing method and data analysis by using APSYS simulator. Results of simulation not only infer that PSS can decrease reflexive angle in the form of hemisphere, but also increase the Transmission angle and all this so that light reflection on it to be increased, moreover, increasing cone in its formula causes increase in light performance.

scholarly journals Enhancing the Optical Efficiency of Near-Eye Displays with Liquid Crystal Optics

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 107
Author(s):  
Tao Zhan ◽  
En-Lin Hsiang ◽  
Kun Li ◽  
Shin-Tson Wu
Keyword(s):  
Virtual Reality ◽  
Liquid Crystal ◽  
High Efficiency ◽  
Berry Phase ◽  
Optical Element ◽  
Liquid Crystal Polymer ◽  
Proof Of Concept ◽  
Optical Efficiency ◽  
Crystal Polymer ◽  
Light Efficiency

We demonstrate a light efficient virtual reality (VR) near-eye display (NED) design based on a directional display panel and a diffractive deflection film (DDF). The DDF was essentially a high-efficiency Pancharatnam-Berry phase optical element made of liquid crystal polymer. The essence of this design is directing most of the display light into the eyebox. The proposed method is applicable for both catadioptric and dioptric VR lenses. A proof-of-concept experiment was conducted with off-the-shelf optical parts, where the light efficiency was enhanced by more than 2 times.

Comprehensive vector analysis for electro-optical, opto-electronic and optical devices

2021 ◽  
Author(s):  
Ting Qing ◽  
Shupeng Li ◽  
Xiaohu Tang ◽  
Ping Li ◽  
Xufeng Chen ◽  
...  
Keyword(s):  
Optical Devices ◽  
Vector Analysis

975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barriers

2010 ◽  
Vol 96 (13) ◽  
pp. 131110 ◽  
Author(s):  
P. Crump ◽  
A. Pietrzak ◽  
F. Bugge ◽  
H. Wenzel ◽  
G. Erbert ◽  
...  
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Diode Lasers ◽  
Far Field ◽  
Power Diode

Experimental Research of High Efficiency Water Reducing Agent in Improving Crack Resistance of Thin Layer Concrete

2014 ◽  
Vol 505-506 ◽  
pp. 188-191
Author(s):  
Ji Feng Liang ◽  
Chao Zhang ◽  
Yuan Hao Zhang
Keyword(s):  
Data Analysis ◽  
Carboxylic Acid ◽  
Thin Layer ◽  
Experimental Research ◽  
Crack Width ◽  
High Efficiency ◽  
Crack Depth ◽  
Measured Data ◽  
Maintenance Costs ◽  
Airport Pavement

After thin layer repaired, airport pavement will still appear crack, this situation not only spend a lot of maintenance costs, and seriously affect the use. This paper made flat constraint test for concrete containing poly carboxylic acid by using reinforced constraint plate mold, then the KON-FK(O) crack width tester and KON-FSY crack depth tester has been used in measuring on the surface of a block. Through the measured data analysis, crack effect is best when poly carboxylic acid with percentage of 2% and 2%.

Poynting Vector Analysis of Synchronous Generators Using Field Simulations

2007 ◽  
Vol 43 (9) ◽  
pp. 3601-3606 ◽  
Author(s):  
Urban Lundin ◽  
BjÖrn Bolund ◽  
Mats Leijon
Keyword(s):  
Poynting Vector ◽  
Vector Analysis ◽  
Synchronous Generators

Design and Testing of an Adjustable Linkage for a Variable Displacement Pump

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Shawn R. Wilhelm ◽  
James D. Van de Ven
Keyword(s):  
High Efficiency ◽  
Operating Conditions ◽  
The Novel ◽  
Hydraulic Pump ◽  
Low Friction ◽  
Transmission Angle ◽  
Displacement Pump ◽  
Order Of Magnitude ◽  
Variable Displacement ◽  
Design And Testing

A variable displacement hydraulic pump/motor with high efficiency at all operating conditions, including low displacement, is beneficial to multiple applications. Two major energy loss terms in conventional pumps are the friction and lubrication leakage in the kinematic joints. This paper presents the synthesis, analysis, and experimental validation of a variable displacement sixbar crank-rocker-slider mechanism that uses low friction pin joints instead of planar joints as seen in conventional variable pump/motor architectures. The novel linkage reaches true zero displacement with a constant top dead center position, further minimizing compressibility energy losses. The synthesis technique develops the range of motion for the base fourbar crank-rocker and creates a method of synthesizing the output slider dyad. It is shown that the mechanism can be optimized for minimum footprint and maximum stroke with a minimum base fourbar transmission angle of 30 deg and a resultant slider transmission angle of 52 deg. The synthesized linkage has a dimensionless stroke of 2.1 crank lengths with a variable timing ratio and velocity and acceleration profiles in the same order of magnitude as a comparable crank-slider mechanism. The kinematic and kinetic results from an experimental prototype linkage agree well with the model predictions.

High efficiency all-optical diode based on photonic crystal waveguide

2016 ◽  
Vol 368 ◽  
pp. 7-11 ◽  
Author(s):  
Bin Liu ◽  
Yun-Feng Liu ◽  
Shu-Jing Li ◽  
Xing-Dao He
Keyword(s):  
Photonic Crystal ◽  
High Efficiency ◽  
Photonic Crystal Waveguide ◽  
All Optical ◽  
Optical Diode
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