Concept

Digital microscope

Publications associées (71)

Measurement and interpretation of the 3D amplitude point spread function of lenses and microscope objectives

The intensity point spread function (IPSF) is most often used to characterize optical imaging systems. For some imaging applications such as digital holographic microscopy the 3D amplitude point spread function (APSF) more completely describes an optical s ...

EPFL2005

Polarization microscopy by use of digital holography: application to optical- fiber birefringence measurements

René Salathé, Christian Depeursinge, Tristan Colomb, Etienne Cuche, Hans Georg Limberger, Pierre Marquet, Florian Dürr

We present a digital holographic microscope that permits one to image polarization state. This technique results from the coupling of digital holographic microscopy and polarization digital holography. The interference between two orthogonally polarized re ...

2005

Scanning near-field infrared microscopy and spectromicroscopy applied to nano-systems and cells

Dusan Vobornik

This thesis further explores the possibilities of scanning near-field optical microscopy (SNOM) in both materials and life sciences. Two experimental SNOM setups were developed: one designed for infrared spectroscopy applications and the other for the imag ...

EPFL2005

Complex-Wave Retrieval from a Single Off-Axis Hologram

Michaël Unser, Thierry Blu

We present a new digital two-step reconstruction method for off-axis holograms recorded on a CCD camera. First, we retrieve the complex object wave in the acquisition plane from the hologram's samples. In a second step, if required, we propagate the wave f ...

OSA2004

Apertureless SNOM

In this thesis a new scanning near field optical microscope based on an apertureless scattering technique is introduced for resolving optical properties of surfaces with lateral resolution reaching 10 nm and better. The construction of the instrument is ba ...

EPFL2004

Application of CMOS image sensors in optical sectioning and polarization microscopy

Jelena Mitic

In this thesis new imaging approaches for optical microscopy are proposed and studied. They are based on the use of dynamic structured illumination in combination with a demodulation detection concept employing CMOS image detectors. Two particular implemen ...

EPFL2004

Point spread function models for digital holographic microscopy

Christian Depeursinge, Mihaela Marian

Few models, based on the diffraction theory, are proposed in order to evaluate the point spread function of different microscope objectives used in a digital holographic microscope. Because in holography the phase information is essential, a 3D amplitude p ...

SPIE2004

Scanning optical near field microscope for use with different contrast methods, including phase contrast microscopy, has an improved photo-detector design that improves resolution and imaging of the smallest structures

Theo Lasser

Optical near field microscope for use with different, including differential contrast, methods. Microscope has a near field illuminating light source probe (3) and a photo-detector for detection of light from the object (6). Said detector has electronics f ...

2003

Point spread function model for microscopic image deconvolution in digital holographic microscopy

Christian Depeursinge, Etienne Cuche, Mihaela Marian

A simple model is proposed in order to evaluate the complex amplitude point spread function (intensity and phase) of a microscope objective. The model is based on the Fresnel diffraction theory and takes also into account the possible optical aberrations. ...

SPIE2003

Scanning near field infrared microscopy using chalcogenide fiber tips

Giorgio Margaritondo

Chalcogenide glass optical fibers were fabricated into functional apertured probes for near field scanning infrared microscopy. Probe fiber tips were chemically etched and aluminum coated for the purpose of simultaneously collecting near field shear force ...

2000

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