Concept

Gradient-index optics

Related publications (103)

Polarization control and sensing with two-dimensional coupled photonic crystal microcavity arrays

We have experimentally studied polarization properties of the two-dimensional coupled photonic crystal microcavity arrays and observed a strong polarization dependence of the transmission and reflection of light from the structures-effects that can be empl ...

2005

Measurement of the integral refractive index and dynamic cell morphometry of living cells with digital holographic microscopy

Pierre Magistretti, Christian Depeursinge, Etienne Cuche, Benjamin Rappaz, Pierre Marquet

We have developed a digital holographic microscope (DHM), in a transmission mode, adapted to the quantitative study of cellular dynamics. Living cells in culture are optically probed by measuring the phase shift they produce on the transmitted wave front. ...

2005

Short-term immunosuppression reduces fibrotic cellular infiltration around barium-M-alginate microbeads injected intraportally

Philipp Bucher, Jutta Christine Wandrey

Introduction. One of the major barriers affecting the viability of encapsulated islets is pericapsular ﬁbrotic inﬁltration (PFI). This study aimed to design strategies to reduce PFI around intraportally injected alginate microbeads. Methods. Empty, highly ...

2004

Photorefractive properties of lithium niobate crystals doped with manganese

Demetri Psaltis

The photorefractive properties of lithium niobate crystals doped with manganese (Mn) have been investigated. It is found that the effect of dark decay due to electron tunneling, which is the limiting factor of the highest practical doping level, is less in ...

2003

Fiber bragg grating characterization by optical low coherence reflectometry and sensing applications

Philippe Giaccari

This work connects of three domains of fiber optics : the fiber Bragg gratings (FBG), the optical low coherence reflectometry (OLCR) and the fiber optical sensors (using FBGs, the OLCR or a combination of both). Fiber Bragg gratings are fiber optic devices ...

EPFL2003

Toward ultrahigh-efficiency aluminum oxide microcavity light- emitting diodes: Guided mode extraction by photonic crystals

Romuald Houdré, Jean-François Carlin, Ursula Oesterle, Henri Benisty

In this paper, we present an improved version of microcavity light-emitting diodes, relying on the use of a low-index material, aluminum oxide. Our work addresses in particular the injection scheme required by the insulating nature of this oxide. The devic ...

2002

Development of neutron optical components at ILL

The neutron optics laboratory at ILL carries out an innovative research program in various fields of neutron optics with the aim of developing new and improved tools for neutron instrumentation. An overview of some recent highlights is presented, indicatin ...

2002

Integrated optical sensor micro-systems based on disposable transducers

In this work novel concepts for the realization of miniature integrated optical sensor systems are presented. An important aspect for all realized approaches was their suitability for the use of disposable sensor chips. This is essential, especially for ap ...

EPFL2000

PZT coated optical fibers for acousto-optical modulation

Nava Setter, Paul Muralt

Piezoelectric coatings of PbZrxTi1-xO3 (PZT) were deposited on standard telecommunication fibers. The PZT coatings were produced by reactive de magnetron sputtering of metal targets in pure oxygen atmosphere. The deposition was carried out at substrate tem ...

1999

Structure artifact free multi-level error diffusion algorithm

Roger Hersch

Error-diffusion is widely used to generate intensity levels between the primary levels of multi-level colour printing devices (ink-jet printers, electrophotographic printers). Standard error-diffusion algorithms produce structure artifacts at rational inte ...

The International Society for Optical Engineering1998

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