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Partial spatial coherence and polarization in purely evanescent electromagnetic fields
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101). Aalto University, Espoo, Finland.
2010 (English)In: 2010 9th Euro-American Workshop on Information Optics, WIO 2010, 2010, 5582497- p.Conference paper (Refereed)
Abstract [en]

We study the partial spatial coherence and partial three-dimensional polarization in electromagnetic fields consisting of a superposition of evanescent plane waves generated in total internal reflection. In particular, we investigate the coherence length in such fields, and demonstrate that it can be shorter than the wavelength of the propagating field above the dielectric surface. The higher the refractive-index contrast at the interface is, and the closer to the surface the field is considered, the shorter is the coherence length. Physical explanation for this behavior analogous to the generation of incoherent light in a multimode gas laser is provided. We also assess the degree of polarization in evanescent fields by using a recent threedimensional formulation.

Place, publisher, year, edition, pages
2010. 5582497- p.
Keyword [en]
Coherence lengths, Degree of polarization, Dielectric surface, Evanescent fields, Incoherent light, Index contrasts, Multimodes, Plane wave, Propagating field, Spatial coherence, Three dimensional formulation, Total internal reflections, Electromagnetic fields, Gas lasers, Lasers, Refractive index, Electromagnetic wave polarization
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URN: urn:nbn:se:kth:diva-149703DOI: 10.1109/WIO.2010.5582497ScopusID: 2-s2.0-78149460180ISBN: 978-142448227-6OAI: diva2:741269
2010 9th Euro-American Workshop on Information Optics, WIO 2010, 12 July 2010 through 16 July 2010, Helsinki, Finland

QC 20140827

Available from: 2014-08-27 Created: 2014-08-26 Last updated: 2014-08-27Bibliographically approved

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Friberg, Ari T.
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Optics and Photonics (Closed 20120101)
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