Publications related to Fresnel number

Longitudinal-differential interferometry: direct imaging of axial superluminal phase propagation

Hans Peter Herzig, Toralf Scharf, Myun Sik Kim

We introduce and demonstrate a new interferometric method called longitudinal-differential (LD) interferometry, which measures the spatially resolved phase difference of the scattered field by an object relative to the illumination. This method is combined ...

Optical Society of America2012

Full-field microimaging with 8 keV X-rays achieves a spatial resolutions better than 20 nm

Giorgio Margaritondo

Fresnel zone plates (450 nm thick Au, 25 nm outermost zone width) used as objective lenses in a full field transmission reached a spatial resolution better than 20 nm and 1.5% efficiency with 8 keV photons. Zernike phase contrast was also realized without ...

Optical Society of America2011

Measuring amplitude and phase of light emerging from microstructures with HRIM

Hans Peter Herzig, Toralf Scharf, Myun Sik Kim

Ultra high-resolution measurements of amplitude and phase fields emerging from fine period amplitude gratings are presented and discussed. In the axial direction periodically repeated features are found, whose origins are the Talbot effect within the Fresn ...

SPIE Digital Library2011

Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Hans Peter Herzig, Toralf Scharf, Myun Sik Kim

We experimentally engineer Nanojets produced by dielectric spheres by varying the illumination and observe the effect with a high-resolution interference microscope (HRIM). Converging and diverging spherical wavefronts and Bessel- Gauss beams are considere ...

SPIE2011

Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Hans Peter Herzig, Toralf Scharf, Myun Sik Kim

We experimentally engineer Nanojets produced by dielectric spheres by varying the illumination and observe the effect with a high-resolution interference microscope (HRIM). Converging and diverging spherical wavefronts and Bessel- Gauss beams are considere ...

SPIE2011

Generation of a high depth of focus with constant transversal spot size using a phase-only pupil filter

Pramod Rastogi, Daniel Iwaniuk

A novel approach is proposed to obtain an extended depth of focus (DoF) in white light with constant transversal spot size within the DoF. It combines a phase-only pupil filter based on multiplexed radial zones with alternating quartic phase functions. The ...

Taylor & Francis2010

Coherence and wavefront characterization of Si-111 monochromators using double-grating interferometry

Christian David

A study of the coherence and wavefront properties of a pseudo-channel-cut monochromator in comparison with a double-crystal monochromator is presented. Using a double-grating interferometer designed for the hard X-ray regime, the complex coherence factor w ...

2010

Infrared Measurements of the RF Output of 170-GHz/2-MW Coaxial Cavity Gyrotron and Its Phase Retrieval Analysis

Timothy Goodman, Stefano Alberti, Jean-Philippe Hogge

We report the experimental results of the infrared measurements of output RF beam of the European 2-MW 170-GHz coaxial cavity gyrotron for ITER. The output beam profile is measured by the infrared thermographic technique using an infrared camera and a targ ...

2009

Small Reconstruction Distance in Convolution Formalism

Christian Depeursinge, Tristan Colomb, Frédéric Montfort

Different numerical wavefront propagations in Fresnel approximation are proposed in digital holography. Standard convolution formalism fails for small reconstruction distances. We developed a simplified convolution formalism that is equivalent to the angul ...

OSA2008

Fabrication of Fresnel zone plates for hard X-rays

Christian David

A method to fabricate gold structures with high aspect ratio is presented. Fresnel zone plates with an outermost zone width of 100nm and structures of 1μm height are fabricated. Preliminary focusing results at an X-ray energy of 8keV are presented and ways ...

2007

Fresnel number

Longitudinal-differential interferometry: direct imaging of axial superluminal phase propagation

Full-field microimaging with 8 keV X-rays achieves a spatial resolutions better than 20 nm

Measuring amplitude and phase of light emerging from microstructures with HRIM

Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Generation of a high depth of focus with constant transversal spot size using a phase-only pupil filter

Coherence and wavefront characterization of Si-111 monochromators using double-grating interferometry

Infrared Measurements of the RF Output of 170-GHz/2-MW Coaxial Cavity Gyrotron and Its Phase Retrieval Analysis

Small Reconstruction Distance in Convolution Formalism

Fabrication of Fresnel zone plates for hard X-rays

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Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Generation of a high depth of focus with constant transversal spot size using a phase-only pupil filter

Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Infrared Measurements of the RF Output of 170-GHz/2-MW Coaxial Cavity Gyrotron and Its Phase Retrieval Analysis

Coherence and wavefront characterization of Si-111 monochromators using double-grating interferometry

Fabrication of Fresnel zone plates for hard X-rays

Longitudinal-differential interferometry: direct imaging of axial superluminal phase propagation

Full-field microimaging with 8 keV X-rays achieves a spatial resolutions better than 20 nm

Measuring amplitude and phase of light emerging from microstructures with HRIM

Small Reconstruction Distance in Convolution Formalism