Concept

Numerical aperture

Related publications (124)

Characterization of light collection through a subwavelength aperture from a point source

We experimentally measure and theoretically model the light transmission characteristics of subwavelength apertures. The characterization consists of translating a point source at varying vertical height and lateral displacement from the aperture and measu ...

2006

On-chip extrusion of lipid vesicles and tubes through microsized apertures

Philippe Renaud

In this work we present the formation of micrometre-sized lipid vesicles and tubes with perfectly homogeneous diameter and extraordinary length. The method is a novel approach for unconventional fabrication of soft-matter microstructured devices based on t ...

2006

Fabrication of metallic patterns by microstencil lithography on polymer surfaces suitable as microelectrodes in integrated microfluidic systems

Jürgen Brugger, Marc Antonius Friedrich van den Boogaart, Nao Takano, Helmut Knapp

Microstencil lithography, i.e. local deposition of micrometer scale patterns through small shadow masks, is a promising method for metal micropattern definition on polymer substrates that cannot be structured using organic-solvent-based photoresist technol ...

2006

Solid immersion lens used in a microscope with a lens system is made of a material having a refractive index that is selected so that the numerical aperture of the lens system

Theo Lasser, Ramachandra Rao

The invention relates to a solid immersion lens (SIL) for a microscope, comprising a lens system with a predetermined numerical aperture. The refractive index of the material of the solid immersion lens is selected in such a way that the numerical aperture ...

2005

Nanostencil technique and its applications to Nanoelectronics

Jürgen Brugger, Oscar Vazquez Mena

The Nanostencil technique is an emerging nanopatterning method based on shadow mask evaporation. Micro and sub-micron apertures (down to 100-nm scale) are patterned in 100-500 nm thick low-stress silicon nitride membranes. The membrane is brought in close ...

2005

Microlenses metrology with digital holographic microscopy

Christian Depeursinge, Tristan Colomb, Etienne Cuche, Frédéric Montfort, Jonas Kühn, Florian Charrière

Digital holographic Microscopy (DHM) is an imaging modality reconstructing the wavefront in a numerical form, directly from a single digitalized hologram. It brings quantitative data derived simultaneously from the amplitude and phase of the complex recons ...

SPIE2005

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

Multiple scattering in wide-field optical coherence tomography

Boris Clément Karamata

Optical Coherence Tomography (OCT), a well-established imaging method based on low-coherence interferometry, provides cross-sectional images of the internal structure of biological samples with a resolution in the micrometer range. OCT was successfully app ...

EPFL2004

Compact liquid-crystal-polymer Fourier-transform spectrometer

René Dändliker, Toralf Scharf, Gerben Boer

We present the optical design and realization of a low-resolution liquid-crystal (LC) Fourier-transform spectrometer (FTS). This FTS is based on a polarization interferometer that has a Wollaston prism made of a LC material as a key component. It has a com ...

2004

Folded shift multiplexing

Demetri Psaltis, Wei Liu

Shift multiplexing is a holographic recording method that uses a spherical reference wave. We extend the principle to a thin slab of holographic material that acts as a waveguide. Total internal reflection folds the reference spherical beam in one dimensio ...

2003

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