Uncovering phase maps from surface plasmon resonance images: Towards a sub-wavelength resolution
Comptes Rendus Physique(2012)
Abstract
We present an original method for uncovering phase maps from surface plasmon resonance microscopy images. The phase images obtained from the recording of V(Z) 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 Δϕ/ΔZ from the V(Z) 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.
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Key words
Surface plasmon resonance,SPR phase imaging,Evanescent waves,Scanning surface plasmon microscopy,Heterodyne interferometry
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