Couplings in GaAs/AlGaAs/Metal Photonic Waveguides with Metallic Variations

MRS Proceedings ◽

10.1557/opl.2012.82 ◽

2012 ◽

Vol 1396 ◽

Author(s):

Meng-Mu Shih

Keyword(s):

Mode Coupling ◽

Hybrid Structure ◽

Wave Mode ◽

Photonic Devices ◽

Coupling Coefficients ◽

Light Emitting ◽

Photonic Waveguides ◽

And Performance ◽

Metal Gratings ◽

Future Work

ABSTRACTTo have better light-emitting performance, semiconductor-metal periodic photonic waveguides can generate stable wavelengths. This work constructs a multi-parameter model to compute the backward-wave mode-coupling coefficients, which are important to the analysis and performance of photonic devices. For such a semiconductor-metal hybrid structure, a proper photonic technique needs to be utilized to solve this computational complexity.Numerical results demonstrate how the materials of metal gratings, the corrugation amplitudes of metal gratings, and the metallic aluminum mole fraction can affect the coupling coefficients. Further physical interpretation and discussion can support and explain the above results. The results can help engineers decide the values of parameters used in fabrication. Future work and applications will be proposed.

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Modeling Silicon-Based Periodic Waveguides for Optical Interconnects

MRS Proceedings ◽

10.1557/opl.2012.1502 ◽

2012 ◽

Vol 1438 ◽

Author(s):

Meng-Mu Shih

Keyword(s):

Optical Waveguides ◽

Mode Coupling ◽

Optical Interconnects ◽

Hybrid Structure ◽

Photonic Devices ◽

Coupling Coefficients ◽

Silicon Photonic ◽

Metal Gratings ◽

Silicon Based ◽

Planar Optical Waveguides

ABSTRACTTo assist the precision and stability of wavelength at 1550 nm and 1300 nm in planar optical waveguides, hybrid semiconductor-metal corrugated gratings with nanometer period are integrated into silicon-based optical interconnects. This work utilizes multi-parametric optical waveguide models to compute the mode-coupling coefficients in the silicon photonic devices. For such a semiconductor-metal hybrid structure, a proper photonic technique needs to be utilized to solve this computational complexity. The optical method and the photonic method are used to compute coupling coefficients. Both methods have close numerical values shown in figures. Numerical results demonstrate how the normalized corrugation amplitudes of metal gratings can affect the coupling coefficients. Further physical interpretation and discussion can support and explain the above results. The modeling results can help engineers decide the values of parameters used in the design and fabrication of optical waveguides.

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Wearable Technologies in Field Hockey Competitions: A Scoping Review

Sensors ◽

10.3390/s21155242 ◽

2021 ◽

Vol 21 (15) ◽

pp. 5242

Author(s):

Jolene Ziyuan Lim ◽

Alexiaa Sim ◽

Pui Wah Kong

Keyword(s):

Heart Rate ◽

Inertial Sensors ◽

Wearable Devices ◽

Field Hockey ◽

Heart Rate Monitors ◽

Search Terms ◽

Physiological Demands ◽

And Performance ◽

Future Work ◽

Skin Temperatures

The aim of this review is to investigate the common wearable devices currently used in field hockey competitions, and to understand the hockey-specific parameters these devices measure. A systematic search was conducted by using three electronic databases and search terms that included field hockey, wearables, accelerometers, inertial sensors, global positioning system (GPS), heart rate monitors, load, performance analysis, player activity profiles, and competitions from the earliest record. The review included 39 studies that used wearable devices during competitions. GPS units were found to be the most common wearable in elite field hockey competitions, followed by heart rate monitors. Wearables in field hockey are mostly used to measure player activity profiles and physiological demands. Inconsistencies in sampling rates and performance bands make comparisons between studies challenging. Nonetheless, this review demonstrated that wearable devices are being used for various applications in field hockey. Researchers, engineers, coaches, and sport scientists can consider using GPS units of higher sampling rates, as well as including additional variables such as skin temperatures and injury associations, to provide a more thorough evaluation of players’ physical and physiological performances. Future work should include goalkeepers and non-elite players who are less studied in the current literature.

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Using Self-Aligned Si Barrier to Enhance the Contrast Ratio and Performance of Pixelated Light Emitting Diode for Vehicle Headlamp

ECS Journal of Solid State Science and Technology ◽

10.1149/2162-8777/abf47d ◽

2021 ◽

Author(s):

Sang-Youl Lee ◽

Doyub Kim ◽

Kiman Kang ◽

Eunduk Lee ◽

Yoomin Jo ◽

...

Keyword(s):

Light Emitting Diode ◽

Contrast Ratio ◽

Light Emitting ◽

And Performance

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ChemInform Abstract: Zinc Oxide Nanorod Based Photonic Devices: Recent Progress in Growth, Light Emitting Diodes and Lasers

ChemInform ◽

10.1002/chin.201035225 ◽

2010 ◽

Vol 41 (35) ◽

pp. no-no ◽

Cited By ~ 1

Author(s):

M. Willander ◽

O. Nur ◽

Q. X. Zhao ◽

L. L. Yang ◽

M. Lorenz ◽

...

Keyword(s):

Zinc Oxide ◽

Recent Progress ◽

Light Emitting Diodes ◽

Photonic Devices ◽

Light Emitting

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Fabrication and performance of efficient blue light emitting III-nitride photonic crystals

Applied Physics Letters ◽

10.1063/1.1808881 ◽

2004 ◽

Vol 85 (17) ◽

pp. 3663-3665 ◽

Cited By ~ 28

Author(s):

Lu Chen ◽

Arto V. Nurmikko

Keyword(s):

Photonic Crystals ◽

Blue Light ◽

Light Emitting ◽

And Performance

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Improved crystal quality and performance of GaN-based light-emitting diodes by decreasing the slanted angle of patterned sapphire

Applied Physics Letters ◽

10.1063/1.3304004 ◽

2010 ◽

Vol 96 (5) ◽

pp. 051109 ◽

Cited By ~ 65

Author(s):

Ji-Hao Cheng ◽

YewChung Sermon Wu ◽

Wei-Chih Liao ◽

Bo-Wen Lin

Keyword(s):

Light Emitting Diodes ◽

Crystal Quality ◽

Light Emitting ◽

And Performance

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Mode Coupling in the Solar Corona. II. Oblique Incidence

Australian Journal of Physics ◽

10.1071/ph740043 ◽

1974 ◽

Vol 27 (1) ◽

pp. 43 ◽

Cited By ~ 9

Author(s):

DB Melrose

Keyword(s):

Physical Interpretation ◽

Mode Coupling ◽

Present Method ◽

Iterative Procedure ◽

Oblique Incidence ◽

Explicit Solutions ◽

Finite Range ◽

Coupling Coefficients ◽

Magnetic Structures ◽

One Step

Previous discussions of mode coupling at a QT region have assumed vertical incidence and have hus invoked magnetic structures which violate div B = o. A new method is developed here for alculating the coupling coefficients for oblique incidence so that coupling at a QT region can be reated without invoking nonphysical magnetic structures. The method involves solving the Booker uartic equation implicitly in terms of the familiar formulae of magnetoionic theory. A coupling pproximation is introduced which involves one step in an iterative procedure to find explicit solutions rom the implicit ones. The approximation is necessarily valid in a finite range about the critical oupling points. The present method is used to generalize the results of Cohen to allow oblique ncidence. The results of the existing discussions of mode coupling for vertical incidence and nonphysical agnetic structures can be justified both qualitatively and semiquantitatively (although ith a slightly different physical interpretation).

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