Publications de Mihaela Marian

Predicting spacial similarity of freshwater fish biodiversity

A major issue in modern ecology is to understand how ecological complexity at broad scales is regulated by mechanisms operating at the organismic level. What specific underlying processes are essential for a macroecological pattern to emerge? Here, we anal ...

2009

Method and apparatus to measure and compute the amplitude point spread function and associated parameters of a coherent optical imaging system

Tristan Colomb, Christian Depeursinge, Pierre Marquet, Florian Charrière, Mihaela Marian

The invention concerns a method of and an apparatus for the measurement of the Amplitude Point Spread Function (APSF), of an Optical Imaging System (OIS), wherein the APSF is defined as the complex field distribution of the beam delivered by the OIS and or ...

2008

On the complex three-dimensional amplitude point spread function of lenses and microscope objectives: theoretical aspects, simulations and measurements by digital holography

Tristan Colomb, Frédéric Montfort, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière, Mihaela Marian

The point spread function is widely used to characterize the three-dimensional imaging capabilities of an optical system. Usually, attention is paid only to the intensity point spread function, whereas the phase point spread function is most often neglecte ...

2007

Amplitude point spread function measurement of high NA microscope objectives by digital holographic microscopy

Tristan Colomb, Christian Depeursinge, Pierre Marquet, Florian Charrière, Mihaela Marian

We present here a three-dimensional evaluation of the amplitude point-spread function (APSF) of a microscope objective (MO), based on a single holographic acquisition of its pupil wavefront. The aberration function is extracted from this pupil measurements ...

2007

Numerical parametric lens for shifting, magnification and complete aberration compensation in digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Stéphane Bourquin, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Jonas Kühn, Florian Charrière, Mihaela Marian

The concept of numerical parametric lenses (NPL) is introduced to achieve wavefront reconstruction in digital holography. It is shown that operations usually performed by optical components and described in ray geometrical optics, such as image shifting, m ...

2006

Cell refractive index tomography by digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière, Mihaela Marian

For what we believe to be the first time, digital holographic microscopy is applied to perform optical diffraction tomography of a pollen grain. Transmission phase images with nanometric axial accuracy are numerically reconstructed from holograms acquired ...

2006

WAVE FRONT SENSING METHOD AND APPARATUS

Tristan Colomb, Frédéric Montfort, Stéphane Bourquin, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Florian Charrière, Mihaela Marian

A new way of mixing instrumental and digital means is described for the general field of wave front sensing. The present invention describes the use, the definition and the utility of digital operators, called digital wave front operators (DWFO) or ... A n ...

2006

Digital Holographic Microscopy, a new imaging technology applied to nanotechnology and life

Tristan Colomb, Frédéric Montfort, Stéphane Bourquin, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Jonas Kühn, Florian Charrière, Mihaela Marian, Pierre Magistretti

2005

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

Mihaela Marian

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