Diffraction

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a screen by diffraction from a square aperture]] Diffraction refers to various phenomena which occur when a wave encounters an obstacle. Italian scientist Francesco Maria Grimaldi coined the word "diffraction" and was the first to record accurate observations of the phenomenon in 1665. (Wikipedia.org)






Conferences related to Diffraction

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2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

This is the annual symposium for the IEEE Antennas and Propagation Society, and it is joint with the US National Committee of URSI's Radio Science Meeting.


2013 13th Mediterranean Microwave Symposium (MMS)

2013 MMS will include distinguished keynote speakers, parallel oral presentations and poster sessions. Topics cover state-of-the art as well as current progress and recent developments in several emerging topics related to RF, microwave engineering and applications.

  • 2011 Mediterranean Microwave Symposium (MMS)

    MMS 2011 will provide an international forum for reporting progress and recent developments in RF and microwave and in many other related topics theory and applications . MMS'2011 will consist of technical and invited sessions and keynote and tutorial sessions covering the state-of-the art of several hot topics in RF and microwave engineering and technology.

  • 2010 10th Mediterranean Microwave Symposium (MMS)

    MMS2010 will provide an international forum for reporting progress and recent developments in RF and microwave theory and applications. Suggested topics are listed below, but consideration will be given to papers on other subjects.

  • 2009 Mediterranean Microwave Symposium (MMS)

    MMS 2005 will provide an international forum for reporting progress and recent developments in RF and microwave theory and applications. Suggested topics are listed below, but consideration will be given to papers on other subjects. Suggested Topics : 1. Propagation, Scattering and diffraction 2. Microwave and Millimeter-Wave Circuits. 3. Photonics, non linear optics and devices 4. Microwaves and millimeterwave devices CAD 5. RF and Wireless Technology and Applications 6. Interconnects 7. W


2013 XVIIIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

Theoretical aspects of electrodynamicsWaveguide and photonic crystal structuresScattering and diffractionInverse problems and synthesisPropagation in complex mediaAntennas and antenna arraysNumerical methods in electrodynamicsAcoustics: theory and applications


Days on Diffraction 2013 (DD)

Mathematical aspects of wave propagation, Asymptotic techniques, Scattering and diffraction, Electromagnetics, Sound propagation and vibration, Elastic waves and seismology, Nonlinear waves, Microwave and quantum waveguides, Inverse problems, Numerical approaches, Non-stationary phenomena


2010 URSI International Symposium on Electromagnetic Theory (EMTS 2010)

all aspects of electromagnetic theory and its applications



Periodicals related to Diffraction

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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Antennas and Wireless Propagation Letters, IEEE

IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.


Lightwave Technology, Journal of

All aspects of optical guided-wave science, technology, and engineering in the areas of fiber and cable technologies; active and passive guided-wave componentry (light sources, detectors, repeaters, switches, fiber sensors, etc.); integrated optics and optoelectronics; systems and subsystems; new applications; and unique field trials.


Microwave Magazine, IEEE

Focuses on applications of technical knowledge. IEEE Microwave Magazine concentrates on general-interest, applications-oriented articles as well as technical articles in the field of microwave theory and techniques including components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission and detection of microwaves.




Xplore Articles related to Diffraction

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Photonic device fabrication inside transparent materials by tailored femtosecond laser processing

M. Kamata; M. Obara The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003

In this paper, we report on the photonic device fabrication inside silica glasses by loosely focused fs laser under the conditions of incident pulsewidth of 150 fs, incident energy of 15 μJ and effective NA of 0.007 and laser irradiation time of 10 min for each line. Diffraction gratings of 10 μm period and waveguide splitters were fabricated by fs ...


Estimation of subrefraction statistics using surface synoptic meteorological data

R. Harvey IEEE Transactions on Antennas and Propagation, 1987

A companion paper developed a subrefractive fading model, in terms of a minimum effectivekvalue, using surface synoptic meteorological data. The concept is extended here to cover the whole subrefractive event, so that using the effectivekparameterk_{e}, analog radio systems can be simply designed. In the case of digital systems, severe subrefraction may cause outages due to thermal noise increase and this ...


Microstructure and magnetic properties of Ti/CoCrPt/Ti pseudo-sandwich nanogranular films

H. Y. Sun; J. Hu; Z. F. Su; J. L. Xu; S. Z. Feng IEEE Transactions on Magnetics, 2006

We prepared Ti/CoCrPt/Ti pseudo-sandwich granular films by radio-frequency and dc magnetron sputtering onto glass substrates and subsequent in situ annealing. We investigated the microstructure and magnetic properties of the films as a function of Ti overlayer thickness (x). X-ray diffraction profiles show that the CoCrPt magnetic layers are formed as the hexagonal close-packed (HCP) structure. Vibrating sample magnetometer measurements indicate ...


Comparison of different methods for the prediction of the field strength in the VHF range

R. Grosskopf IEEE Transactions on Antennas and Propagation, 1987

A number of prediction methods have been proposed in the literature in recent years. By using topographical data from a terrain data bank, these methods should lead to a more accurate prediction of the field strength in irregular terrain. The prediction accuracy of these methods has been examined by comparing the field strengths they yield to those experimentally determined at ...


High-Performance Continuous Aspheric Microlenses Array For Shack-Hartmann Sensor

Chuankai Qiu; Li Pan; Fei Li; Qu Yue; Ling Liu; Xiangang Luo 2008 IEEE PhotonicsGlobal@Singapore, 2008

Micro lens array (MLA) is the critical element for Shack-Hartmann wave front sensor. But conventional MLA based on diffractive optics shows strong chromatic aberration, which cause the MLA only works for narrow band. The broad band MLA requires continuous profile, which can not be fabricated using binary optics fabrication technique. In this presentation, we present the fabrication for continuous aspheric ...


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Educational Resources on Diffraction

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eLearning

Photonic device fabrication inside transparent materials by tailored femtosecond laser processing

M. Kamata; M. Obara The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003

In this paper, we report on the photonic device fabrication inside silica glasses by loosely focused fs laser under the conditions of incident pulsewidth of 150 fs, incident energy of 15 μJ and effective NA of 0.007 and laser irradiation time of 10 min for each line. Diffraction gratings of 10 μm period and waveguide splitters were fabricated by fs ...


Estimation of subrefraction statistics using surface synoptic meteorological data

R. Harvey IEEE Transactions on Antennas and Propagation, 1987

A companion paper developed a subrefractive fading model, in terms of a minimum effectivekvalue, using surface synoptic meteorological data. The concept is extended here to cover the whole subrefractive event, so that using the effectivekparameterk_{e}, analog radio systems can be simply designed. In the case of digital systems, severe subrefraction may cause outages due to thermal noise increase and this ...


Microstructure and magnetic properties of Ti/CoCrPt/Ti pseudo-sandwich nanogranular films

H. Y. Sun; J. Hu; Z. F. Su; J. L. Xu; S. Z. Feng IEEE Transactions on Magnetics, 2006

We prepared Ti/CoCrPt/Ti pseudo-sandwich granular films by radio-frequency and dc magnetron sputtering onto glass substrates and subsequent in situ annealing. We investigated the microstructure and magnetic properties of the films as a function of Ti overlayer thickness (x). X-ray diffraction profiles show that the CoCrPt magnetic layers are formed as the hexagonal close-packed (HCP) structure. Vibrating sample magnetometer measurements indicate ...


Comparison of different methods for the prediction of the field strength in the VHF range

R. Grosskopf IEEE Transactions on Antennas and Propagation, 1987

A number of prediction methods have been proposed in the literature in recent years. By using topographical data from a terrain data bank, these methods should lead to a more accurate prediction of the field strength in irregular terrain. The prediction accuracy of these methods has been examined by comparing the field strengths they yield to those experimentally determined at ...


High-Performance Continuous Aspheric Microlenses Array For Shack-Hartmann Sensor

Chuankai Qiu; Li Pan; Fei Li; Qu Yue; Ling Liu; Xiangang Luo 2008 IEEE PhotonicsGlobal@Singapore, 2008

Micro lens array (MLA) is the critical element for Shack-Hartmann wave front sensor. But conventional MLA based on diffractive optics shows strong chromatic aberration, which cause the MLA only works for narrow band. The broad band MLA requires continuous profile, which can not be fabricated using binary optics fabrication technique. In this presentation, we present the fabrication for continuous aspheric ...


More eLearning Resources

IEEE-USA E-Books

  • Multimode Grating Sensors

    The most comprehensive primer on fiber optic sensors, now in a new edition Now updated to include the most recent developments in this rapidly advancing field, Fiber Optic Sensors fills the needs of both introductory and advanced courses on the topic while also offering a wealth of practical information to the professional. Drawing upon the wisdom of internationally recognized experts, this Second Edition provides thorough coverage of demonstrated sensor concepts as well as areas of future fiber optic sensor development and application. Initial chapters cover optical fibers, light sources, and detectors and optical modulators, while subsequent chapters cover: * Extrinsic or hybrid fiber optic sensors * Intensity sensors for monitoring physical parameters * The Fabry-Perot fiber optic sensor * The Mach-Zehnder interferometer * Sagnac interferometer and fiber gyroscopes * Disp acement fiber optic sensors * Polarization sensors * Industrial applications of fiber optic sensors * Fiber optic smart structures * Fiber Bragg grating sensors * Fiber biosensors Two new extensive chapters have been added to this edition. The first is on the FBG sensor—the most commonly used fiber optic sensor—covering its theory and technology. The second provides a comprehensive analysis of the emerging field of fiber optic biosensors.

  • Indoor Radio Propagation

    The WLAN user needs to understand the relationship between indoor propagation effects and how WLAN performance is affected. This chapter presents the importance of accounting for the signal distribution not only in path loss‐distance domain, but also in joint time‐of‐arrival (TOA) and angle‐of‐arrival (AOA) domains for positioning and service of each subscriber located in indoor environment of service. The propagated electromagnetic signal can undergo three primary physical mechanisms: reflection, diffraction, and scattering. Multipath phenomena of multiple reflection, diffraction, and scattering give rise to additional radio propagation paths beyond the direct line‐of‐sight (LOS) path between the radio transmitter and receiver. The chapter outlines models for path loss within buildings: numerical ray‐tracing unified theory of diffraction (UTD) model; physical waveguide model of radio propagation inside a building corridor; physical model of radio propagation between floors and walls; and empirical models. Finally, it discusses the budget link design of indoor communication links.

  • The Mobile Satellite Channel

    This chapter contains sections titled: Mobile Channel Propagation Narrowband Channel Wideband Channel Multi‐Satellite Mobile Links References

  • Physical Optics Solutions of Canonical Problems

    This chapter shows how to apply the physical optics (PO) method to study electromagnetic scattering from electrically large bodies of simple shapes. It applies this method to infinite cones with variously shaped cross sections and derive approximations for the tip‐diffracted wave. The chapter shows that the PO solution for scattering from opaque plates can always be reduced to a line integral, and if the plate has the form of a polygon the PO integral simplifies even further to a sum of contributions from the tips of the polygon. It focuses on PO solutions for bodies of revolution, and also shows that the transformation to a one‐dimensional integral is possible for the incidence along the symmetry axis of the body. The axial backscattering from smoothly shaped pointed scatterers, like an ogive, is particularly weak, with the main contribution coming from the tip; a broad variety of tip diffraction coefficients.

  • Multipath Fading Phenomena in Terrestrial Wireless Communication Links

    This chapter first compares the results of theoretical predictions of the loss characteristics in the space domain, with experiments carried out in various land environments. It focuses our attention on estimating the accuracy of the statistical description of the built‐up terrain on radio signal spatial attenuation and its frequency dependence. The chapter then presents a theoretical and experimental analysis of slow and fast fading based on the unified algorithm estimating these phenomena in various communication links, taking into consideration both the classical methods and the unified stochastic multiparametric model. Next, it briefly describes the role of Rician K‐factor in multipath phenomena differentiation both in space, angle of arrival (i.e., azimuth), and time of arrival (i.e., time delay) domains. Finally, the chapter deals with radio coverage and radio map constructions accounting for terrain features and overlay profile effects of the buildings, that is, the 3‐D configuration of built‐up terrains.

  • Wireless Transmission Technology and Systems

    This chapter contains sections titled: Introduction Radio Technology Primer Available Wireless Technologies Conclusion Appendix A: Modulation Basics References

  • Radiometry

    Radiometry characterizes the distribution of the optical power or energy in space, as opposed to photometry, which describes the optical radiation's interaction with the human eye. There are two aspects of radiometry: theory and practice. This chapter begins with the basic geometrical definitions necessary to better understand radiometry and the other material to come. Radiometry is composed of the language, mathematics, and instrumentation for characterizing the propagation and effects of energy interacting with various media. It includes the refraction, reflection, absorption, scattering, and transmission by various substances in any of their possible phases: gaseous, liquid, or solid. The most general entity describing local reflection is the bidirectional reflectance distribution function (BRDF). The chapter calculates the spectral radiant exitance and total power radiated into a hemisphere from a Lambertian source of area A and radiance NLambertian. It looks at the irradiance created by a Lambertian source at a point on the optical axis.

  • Digital Optics Modeling Techniques

    This chapter contains sections titled: Tools Based on Ray Tracing Scalar Diffraction Based Propagators Beam Propagation Modeling (BPM) Methods Nonparaxial Diffraction Regime Issues Rigorous Electromagnetic Modeling Techniques Digital Optics Design and Modeling Tools Available Today Practical Paraxial Numeric Modeling Examples

  • Design for Manufacturing

    This chapter contains sections titled: The Lithographic Challenge Software Solutions: Reticle Enhancement Techniques Hardware Solutions Process Solutions

  • Specifying and Testing Digital Optics

    This chapter contains sections titled: Fabless Lithographic Fabrication Management Specifying the Fabrication Process Fabrication Evaluation Optical Functionality Evaluation



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