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Visar resultat 16 - 20 av 66 avhandlingar som matchar ovanstående sökkriterier.

1. 16. Nanostructured electromagnetic metasurfaces at optical frequencies

   Författare :Nils Odebo Länk; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; high-index nanophotonics; colloidal lithography; metasurfaces; geometric resonances; nanostructures; plasmonics;

   Sammanfattning : Electromagnetic metasurfaces are broadly defined as optically thin layersthat are structured on the subwavelength scale. In general, metasurfacesthus consist of nanoparticles, or other kinds of ”meta-atom”, arranged insome pattern where both the individual particle sizes and the inter-particledistances are much smaller than the wavelength. LÄS MER

3. 17. Electromagnetic Interference in Modern Electrified Railway Systems with Emphasis on Pantograph Arcing

   Författare :Surajit Midya; Rajeev Thottappillil; Uppsala University; []
   Nyckelord :Railway EMC;

   Sammanfattning : .... LÄS MER

4. 18. Quantum Coherence and Quantum-Vacuum Effects in Some Artificial Electromagnetic Media

   Författare :Jianqi Shen; Sailing He; Chris Phillips; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Quantum coherence; quantum vacuum; electromagnetically induced transparency; negative refractive index; artificial electromagnetic media; electric- and magnetic-dipole transitions; multilevel atomic vapors; transient evolution; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Sammanfattning : The author of this thesis concentrates his attention on quantum optical properties of some artificial electromagnetic media, such as quantum coherent atomic vapors (various multilevel electromagnetically induced transparency vapors) and negative refractive index materials, and suggests some possible ways to manipulate wave propagations inside the artificial electromagnetic materials based on quantum coherence and quantum vacuum effects. In Chapters 1 and 2, the author reviews the previous papers on quantum coherence as well as the relevant work such as electromagnetically induced transparency (EIT), atomic population trapping and their various applications. LÄS MER

5. 19. Electromagnetic Interference to Electrified Railway Network Caused by Lightning: Development of Computation Models

   Författare :Nelson Theethayi; Rajeev Thottappillil; Uppsala universitet; []
   Nyckelord :Railway EMC; Lightning;

   Sammanfattning : .... LÄS MER

7. 20. Response of Civilian Facilities and Systems to High Power Electromagnetic (HPEM) Pulses and the Threat of Intentional Electromagnetic Interference (IEMI)

   Författare :Daniel Månsson; Rajeev Thottappillil; Uppsala universitet; []
   Nyckelord :EMC; Intentional EMI;

   Sammanfattning : .... LÄS MER