Concept

Airy disk

Related publications (84)

Confining the sampling volume for Fluorescence Correlation Spectroscopy using a sub-wavelength sized aperture

Olivier Martin, Theo Lasser, Patrik Willi Hoffmann, Marcel Leutenegger

For the observation of single molecule dynamics with fluorescence fluctuation spectroscopy (FFS) very low fluorophore concentrations are necessary. For in vitro measurements, this requirement is easy to fulfill. In biology however, micromolar concentration ...

2006

A virtual optical probe based on localized Surface Plasmon Polaritons

Hans Peter Herzig, Vincent Paeder

A confined, evanescent nano-source based on the excitation of Surface Plasmon Polaritons (SPP) on structured thin metal films is proposed. With the help of a suitable cavity, we numerically demonstrate that it is possible to trap SPP over a spatial region ...

2005

High light field confinement for Fluorescence Correlation Spectroscopy using a Solid Immersion Lens

Theo Lasser, Denis Martin, Ramachandra Rao

In this paper we present recent single molecule detection experiment using a solid immersion lens (SIL) for fluorescent correlation spectroscopy measurements. We compared the performance of the SIL in combination with an air objective (40×, numerical apert ...

2004

Fabrication and characterization of metal nanolevers made by shadow mask technology

Jürgen Brugger, Marc Antonius Friedrich van den Boogaart

The evaporation through shadow masks (nanostencils) overcomes the limitations typically given by the patterning methods involving conventional optical lithography and etching, such as diffraction limits and etch-selectivity. It allows making low-cost nanop ...

2004

Wavelength dependent optical force on elliptical silver cylinders at plasmon resonance

Hans Peter Herzig

We use rigorous diffraction theory to analyze the force on elliptical cylinders made from silver as a function of the elongation. We find that, when the wires are illuminated at the plasmon wavelength and placed in a highly focused Gaussian beam, they are ...

2004

Fabrication and characterization of metal nanolevers made by shadow mask technology

Daniel Grogg

Evaporation through shadow masks (nanostencils) overcomes the limitations typically given by patterning methods involving conventional optical lithography and etching, such as diffraction limits and etch-selectivity. This paper demonstrates the fabrication ...

2004

Fragmentation of transition metal carbonyl cluster anions: Structural insights from mass spectrometry

Paul Joseph Dyson

The anionic clusters HOs5-(Co)(15), PtRu5C(CO)(15), Os10C-(CO)(24), Os-17(CO)(36), Os-20(CO)(40) [Co6C(CO)15]2-, Pt3Ru10C2-(CO)(32) and Pd6Ru6(CO)(24) have been analysed by energy-dependent electrospray ionisation m ...

2003

Spectromicroscopy beamline at ELETTRA: Performances achieved at the end of commissioning

Giorgio Margaritondo

In the course of 1998, the Spectromicroscopy beamline at ELETTRA completed commissioning and succeeded in performing its first test experiments. The beamline is designed to perform photoemission experiments with high spatial resolution, which is obtained b ...

2000

Chemical contrast observed at a III-V heterostructure by scanning near-field optical microscopy

Giorgio Margaritondo

We observed chemical contrast with subwavelength resolution on a III-V heterostructure by a scanning near-field optical microscope (SNOM) working in the external reflection mode and coupled with a Free Electron Laser (FEL). SNOM reflectivity images reveale ...

1999

Optical tomography by means of a numerical low-coherence holographic technique

Christian Depeursinge, Etienne Cuche

Digital holograms are recorded by a CCD camera and are numerically reconstructed, in intensity and phase, by means of an algorithm which calculates their discrete Fresnel transform. By using a low-coherence source, the tomography of a 3D scene can be perfo ...

1997

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