The Experts below are selected from a list of 9015 Experts worldwide ranked by ideXlab platform

Arvind Raman - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional mapping of optical near field of a nanoscale bowtie antenna
    Optics Express, 2010
    Co-Authors: Rui Guo, Edward C Kinzel, Sreemanth M V Uppuluri, Arvind Raman
    Abstract:

    Ridge nanoscale aperture antennas have been shown to be a high transmission nanoscale light source. They provide a small, polarization-dependent near-field optical spot with much higher transmission efficiency than circularly-shaped apertures with similar field confinement. This provides significant motivations to understand the electromagnetic fields in the immediate proximity to the apertures. This paper describes an experimental three-dimensional optical near-field mapping of a bowtie nano-aperture. The measurements are performed using a home-built near-field Scanning optical microscopy (NSOM) system. An aluminum coated Si3N4 probe with a 150 nm hole at the tip is used to collect optical signals. Both contact and constant-Height Scan (CHS) modes are used to measure the optical intensity at different longitudinal distances. A force-displacement curve is used to determine the tip-sample separation distance allowing the optical intensities to be mapped at distances as small as 50 nm and up to micrometer level. The experimental results also demonstrate the polarization dependence of the transmission through the bowtie aperture. Numerical simulations are also performed to compute the aperture’s electromagnetic near-field distribution and are shown to agree with the experimental results.

Angela Li - One of the best experts on this subject based on the ideXlab platform.

  • System Level EMC for Multiple EMI Sources
    2019 IEEE International Symposium on Electromagnetic Compatibility Signal & Power Integrity (EMC+SIPI), 2019
    Co-Authors: Javad Meiguni, Morten Soerensen, Ahmad Hosseinbeig, Kaustav Ghosh, Jacques Rollin, Philippe Sochoux, David Pommerenke, Angela Li
    Abstract:

    A system level EMC method is proposed in this paper to predict the electromagnetic interference (EMI) from multiple radiators. The problem under test consists of a large network router with 480 optical modules radiating at 10.3 GHz. The proposed method handles the analysis of this system by using different phased array antenna topologies. Systematic conclusions are presented including the effect of same frequency vs. different frequency of radiating subsystems, the possibility of missing the maximum emission (Emax) during horizontal Scan and Height Scan, and the effect of the radiation pattern for different radiators. The results indicate the existence of a 10 Log N (dB) tendency for the Emax parameter in the case of adding a complex electric field (voltage) and random phase distribution over the line cards. It also shows similarity to an 8 Log N (dB) tendency for adding power intensity for different line cards with slightly offset frequencies. The developed method can be extended to other frequency ranges when necessary. The proposed statistical method is useful when it is not practical to assemble a complete system consisting of several radiating subsystems with different frequencies in EMI testing.

Rui Guo - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional mapping of optical near field of a nanoscale bowtie antenna
    Optics Express, 2010
    Co-Authors: Rui Guo, Edward C Kinzel, Sreemanth M V Uppuluri, Arvind Raman
    Abstract:

    Ridge nanoscale aperture antennas have been shown to be a high transmission nanoscale light source. They provide a small, polarization-dependent near-field optical spot with much higher transmission efficiency than circularly-shaped apertures with similar field confinement. This provides significant motivations to understand the electromagnetic fields in the immediate proximity to the apertures. This paper describes an experimental three-dimensional optical near-field mapping of a bowtie nano-aperture. The measurements are performed using a home-built near-field Scanning optical microscopy (NSOM) system. An aluminum coated Si3N4 probe with a 150 nm hole at the tip is used to collect optical signals. Both contact and constant-Height Scan (CHS) modes are used to measure the optical intensity at different longitudinal distances. A force-displacement curve is used to determine the tip-sample separation distance allowing the optical intensities to be mapped at distances as small as 50 nm and up to micrometer level. The experimental results also demonstrate the polarization dependence of the transmission through the bowtie aperture. Numerical simulations are also performed to compute the aperture’s electromagnetic near-field distribution and are shown to agree with the experimental results.

R A Mcconnell - One of the best experts on this subject based on the ideXlab platform.

M Alexander - One of the best experts on this subject based on the ideXlab platform.

  • antenna Height Scan for minimizing eut emission measurement uncertainty in fully anechoic chambers above 1 ghz
    International Symposium on Electromagnetic Compatibility, 2006
    Co-Authors: Tian Hong Loh, M Alexander
    Abstract:

    Our aim in this research work is to propose a methodology on receiving antenna Height Scan in the fully anechoic room (FAR) to minimize uncertainty in obtaining maximum emission of equipments under test (EUT) that have multilobe radiation patterns at higher frequencies. An EUT with complex slots is measured. The radiation emission for five antenna Heights from 1 m to 1.8 m with a 0.2 m increment are experimentally measured and characterised over the 1 GHz - 15 GHz frequency band for both vertical and horizontal antenna polarizations. Radiation patterns of the EUT are presented.