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Comptes Rendus Physique
Volume 13, n° 8
pages 800-814 (octobre 2012)
Doi : 10.1016/j.crhy.2012.04.004
Uncovering phase maps from surface plasmon resonance images: Towards a sub-wavelength resolution
Extrayant les cartes de phase dʼimages à résonance plasmonique : vers une résolution sous-longueur dʼonde
 

Françoise Argoul a, b, , Thibault Roland a, b, Audrey Fahys a, b, Lotfi Berguiga a, b, Juan Elezgaray c
a Université de Lyon, 69000 Lyon, France 
b USR3010 laboratoire Joliot-Curie, UMR5672 laboratoire de physique, CNRS, Université de Lyon, Ecole normale supérieure de Lyon, 46, allée dʼItalie, 69364 Lyon, France 
c UMR5248 CNRS, université Bordeaux 1, ENITAB, IECB, 2, rue Robert-Escarpit, 33607 Pessac, France 

Corresponding author at: UMR5672 laboratoire de physique, CNRS, Ecole normale supérieure de Lyon, 46, allée dʼItalie, 69364 Lyon, France.
Abstract

We present an original method for uncovering phase maps from surface plasmon resonance microscopy images. The phase images obtained from the recording of   maps with a scanning surface plasmon microscope are affected by zero-mean uncorrelated noise and mechanical drifts. We propose to replace standard phase unwrapping methods by the computation of the local derivative of the phase   from the   complex field. Phase unwrapping basically relies on a smoothness constraint of the phase field, which is severely hampered by the noise. Applications of the proposed derivation to interferometric plasmon phase images demonstrate a superior ability of restoring phase maps, preserving their discontinuities, together with an effective noise smoothing performance, irrespective of locally varying coherence characteristics.

The full text of this article is available in PDF format.
Résumé

Nous proposons une méthode originale pour extraire les cartes de phase dʼimages obtenues par microscopie à résonance plasmonique. Les images de phases recalculées à partir des cartes   complexes incluent également les composantes de bruit et de dérive mécanique, ce qui rend leur déroulement difficile. Nous proposons ici de remplacer les méthodes de déroulement de la phase par le calcul de la dérivée locale   de cette phase à partir du champ complexe  . Cette méthode de dérivation directe à partir du champ complexe   sʼavère beaucoup plus efficace pour restaurer les discontinuités de la phase et permettre également un lissage plus performant du bruit, indépendamment des caractéristiques locales de la cohérence du champ électrique réfléchi après excitation du plasmon de surface.

The full text of this article is available in PDF format.

Keywords : Surface plasmon resonance, SPR phase imaging, Evanescent waves, Scanning surface plasmon microscopy, Heterodyne interferometry

Mots-clés : Résonance plasmonique de surface, Imagerie de phase, Microscopie à balayage à résonance plasmonique, Interférométrie hétérodyne




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