Efficient coupling of narrow beams into polyimide waveguides by means of grating couplers with high-index coating

2010 ◽  
Vol 49 (10) ◽  
pp. 1972 ◽  
Author(s):  
Roman Bruck ◽  
Rainer Hainberger
Keyword(s):  
High Index ◽  
Grating Couplers ◽  
Efficient Coupling

Poly-Silicon Grating Couplers for Efficient Coupling With Optical Fibers

2012 ◽  
Vol 24 (18) ◽  
pp. 1614-1617 ◽  
Author(s):  
Chao Qiu ◽  
Zhen Sheng ◽  
Le Li ◽  
Albert Pang ◽  
Zhiqi Wang ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Grating Couplers ◽  
Poly Silicon ◽  
Efficient Coupling

Efficient coupling of laser diodes to tapered monomode fibres with high-index end

1983 ◽  
Vol 19 (6) ◽  
pp. 205 ◽  
Author(s):  
G.D. Khoe ◽  
J. Poulissen ◽  
H.M. de Vrieze
Keyword(s):  
Laser Diodes ◽  
High Index ◽  
Efficient Coupling

Apodized Waveguide Grating Couplers for Efficient Coupling to Optical Fibers

2010 ◽  
Vol 22 (15) ◽  
pp. 1156-1158 ◽  
Author(s):  
Xia Chen ◽  
Chao Li ◽  
Christy K. Y. Fung ◽  
Stanley M. G. Lo ◽  
Hon K. Tsang
Keyword(s):  
Optical Fibers ◽  
Grating Couplers ◽  
Waveguide Grating ◽  
Efficient Coupling

Low-loss and high index-contrast tantalum pentoxide microring resonators and grating couplers on silicon substrates

2014 ◽  
Vol 39 (18) ◽  
pp. 5379 ◽  
Author(s):  
Payam Rabiei ◽  
Ashutosh Rao ◽  
Jeff Chiles ◽  
Jichi Ma ◽  
Sasan Fathpour
Keyword(s):  
High Index ◽  
Tantalum Pentoxide ◽  
Microring Resonators ◽  
Silicon Substrates ◽  
Low Loss ◽  
Grating Couplers ◽  
Index Contrast ◽  
High Index Contrast

The usefulness of high index low symmetry zone axes for holz line analysis

1987 ◽  
Vol 45 ◽  
pp. 384-385
Author(s):  
C. M. Sung ◽  
D. B. Williams
Keyword(s):  
Lattice Parameter ◽  
High Order ◽  
Zone Axis ◽  
High Index ◽  
High Symmetry ◽  
Second Phases ◽  
Line Patterns ◽  
Low Symmetry ◽  
Line Analysis

Researchers have tended to use high symmetry zone axes (e.g. <111> <114>) for High Order Laue Zone (HOLZ) line analysis since Jones et al reported the origin of HOLZ lines and described some of their applications. But it is not always easy to find HOLZ lines from a specific high symmetry zone axis during microscope operation, especially from second phases on a scale of tens of nanometers. Therefore it would be very convenient if we can use HOLZ lines from low symmetry zone axes and simulate these patterns in order to measure lattice parameter changes through HOLZ line shifts. HOLZ patterns of high index low symmetry zone axes are shown in Fig. 1, which were obtained from pure Al at -186°C using a double tilt cooling holder. Their corresponding simulated HOLZ line patterns are shown along with ten other low symmetry orientations in Fig. 2. The simulations were based upon kinematical diffraction conditions.

Single-electron sensitivity with a lens-coupled CCD camera

1993 ◽  
Vol 51 ◽  
pp. 642-643
Author(s):  
G.Y. Fan ◽  
Bruce Mrosko ◽  
Mark H. Ellisman
Keyword(s):  
Focal Length ◽  
Thick Layer ◽  
Ccd Camera ◽  
Single Electron ◽  
Bottom Flange ◽  
X Rays ◽  
Red Phosphor ◽  
Ccd Detector ◽  
Lens Assembly ◽  
Efficient Coupling

A lens coupled CCD camera showing single electron sensitivity has been built for TEM applications. The design is illustrated in Fig. 1. The bottom flange of a JEM-4000EX microscope is replaced by a special flange which carries a large rectangular leaded glass window, 22 mm thick. A 20 μm thick layer of red phosphor is coated on the window, and the entire window is sputter-coated with a thin layer of Au/Pt. A two-lens relay system is used to provide efficient coupling between the image on the phosphor scintillator and the CCD imager. An f1.0 lens (Goerz optical) with front focal length 71.6 mm is used as the collector. A mirror prism, of the Amici type, is used to "bend" the optical path by 90° to prevent X-rays which may penetrate the leaded glass from hitting the CCD detector. Images may be relayed directly to the camera (1:1) or demagnified by a factor of up to 3:1 by moving the lens assembly.

Mild Temperature Copper-Catalyzed Amination of Aryl Halides with Aqueous Ammonia in the Presence of Pyridyldiketone Ligands

2019 ◽  
Author(s):  
Racha Abed Ali Abdine ◽  
Anna Walczak ◽  
Sultan Abu A Aeash ◽  
Gracjan Kurpik ◽  
Artur R. Stefankiewicz ◽  
...  
Keyword(s):  
Catalytic System ◽  
Aqueous Ammonia ◽  
Aryl Halides ◽  
Efficient Coupling ◽  
Ambidentate Ligand ◽  
Mild Temperature

Ambidentate ligand pyridyldiketones were used in combination with copper to catalyze maintain of aryl halides under very mild temperatures. This novel catalytic system allow efficient coupling in one of the smoothest conditions ever reported in literature.

Challenges and Issues in the Design of Micro-Machined Antennas - A Review

2020 ◽  
Vol 13 ◽  
Author(s):  
Ashish Kumar ◽  
Amar Partap Singh Pharwaha
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Substrate Material ◽  
Review Article ◽  
High Index ◽  
Performance Characteristics ◽  
Machining Process ◽  
Patch Antennas ◽  
Micro Machining ◽  
The Impact

Background: Patch antennas are composed of the substrate material with patch and ground plane on the both sides of the substrate. The dimensions and performance characteristics of the antenna are highly influenced by the choice of the appropriate substrate depending upon the value of their dielectric constant. Generally, low index substrate materials are used to design the patch antenna but there are also some of the applications, which require the implementation of patch antenna design on high index substrate like silicon and gallium arsenide. Objective: The objective of this article is to review the design of antennas developed on high index substrate and the problems associated with the use of these materials as substrate. Also, main challenges and solutions have been discussed to improve the performance characteristics while using the high index substrates. Method: The review article has divided into various sections including the solution of the problems associated with the high index substrates in the form of micro-machining process. Along with this, types of micro machining and their applications have discussed in detail. Results: This review article investigates the various patch antennas designed with micro-machining technology and also discusses the impact of micro-machining process on the performance parameters of the patch antennas designed on high index substrates. Conclusion: By using the micro-machining process, the performance of patch antenna improves drastically but fabrication and tolerances at such minute structures is very tedious task for the antenna designers.

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