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Welcome to the Nano-Optics website.

What we do, in four images: 

Topography
Topography
Magnitude |E|
Magnitude |E|
Phase φ = arg(E(t))
Phase φ = arg(E(t))
Instantaneous field strength ℜ{E(t)}
Instantaneous field strength ℜ{E(t)}

 

We measure plasmonic nano-structures, here gold nano-discs. An atomic force microscope records the topography, while simultaneously our homebuilt apertureless scanning nearfield optical microscope measures the magnitude and phase of the plasmonic eigenmodes of the structures, as they are excited by laser radiation.

 
 
[42] Real-space imaging of nanoplasmonic resonances

Typical top view of a large area gold nanodot matrix on a sapphire substrate made by DiMPLA.

Analyst 135, p.1175-1181 (2010). Minireview.
Link to paper
 
[40] Plasmonic Activity of Large-Area Gold-Nanodot Arrays on Arbitrary Substrates

Typical top view of a large area gold nanodot matrix on a sapphire substrate made by DiMPLA. Three-dimensional view (radius = 300 nm) of the simulated optical response of an isolated, semisubmersed Au sphere (radius = 84 nm). The quarter cutaway reveals the Au−sapphire and sapphire−air interface geometries. The same color scale as in (b) indicates the scattered |Ez| component for λexc = 942 nm at normal incidence.

Nano Lett. 2010, 10 (1), pp 47–51
Link to paper

 
[39] Glimpsing the Weak Magnetic Field of Light

illustration

Science 23 October 2009: Vol. 326. no. 5952, pp. 529 - 530
Link to paper
 
[37] Fabry-Pérot resonances in one-dimensional plasmonic nano-structures

Scheme of the setup. Weakly focused s-polarized radiation excites nanowires largely unperturbed by the probing tip. A typical response field is indicated by the electric field strength distribution on the wire surface and a snapshot of selected field lines. Backscattered light is modulated by the tip vibration (frequency ω) and polarization-analyzed along the tip axis. (a) Resonance curves obtained by plotting the maximum signal per wire versus the wire length. The experimental and simulation data have been extracted from Figure 1. The solid lines show Lorentzians fitted to the data. (b) Plot of the Lorentzians’ peak positions versus the resonance order. The lines are a least-squares fit to the data. The inset is a zoom where the fitted straight lines cross the y axis. (c) Resonance curves when the sample is rotated by ≈20°. (d) Resonance length versus resonance plot of the rotated sample.

Nano Lett. 2009, 9 (6), pp 2372–2377
Link to paper
 
[34] Direct near-field optical imaging of higher order plasmonic resonances.

We map in real space and by purely optical means near-field optical information of localized surface plasmon polariton (LSPP) resonances excited in nanoscopic particles. We demonstrate that careful polarization control enables apertureless scanning near-field optical microscopy (aSNOM) to image dipolar and quadrupolar LSPPs of the bare sample with high fidelity in both amplitude and phase. This establishes a routine method for in situ optical microscopy of plasmonic and other resonant structures under ambient conditions.
Nano Lett. (2008) 8, 3155-3159.
Link to paper
 
 

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