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Tunable and Broadband Nanostructured Photonic Devices

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Reflection of waveguided X-rays in two-dimensional nanostructures

Christian David

The internal reflection of an excited X-ray waveguide mode in a synthetic nanostructure, defined by electron-beam lithography, has been measured. In this device, the X-ray beam is first coupled into a conventional vertical thin-film waveguide structure and ...

2002

Depolarization effects of light reflected by domain-structured cholesteric liquid crystals

Toralf Scharf

The simulation of light reflected by polymer-dispersed cholesteric liquid crystals is carried out using a model that takes into account the domain structure of the layer. The model is based on the 4×4 matrix calculation method of Berreman. One considers di ...

2002

MEMS infrared gas spectrometer based on a porous silicon tunable filter

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a MEMS infrared spectrometer for selective and quantitative chemical gas analysis. infrared absorption spectroscopy can distinguish gases easily and also detect nonreactive molecules like CO2, in contrast to e.g. metal oxide gas sensors The foll ...

2001

Microspectrometer based on a tunable optical filter of porous silicon

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a tunable interference filter for infrared and visible light that scans the desired part of the optical spectrum within milliseconds. A single pixel detector measures serially the intensity at selected wavelengths. This concept avoids expensive ...

2001

Low cost microspectrometer

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

2000

Waveguide photonic crystals and microstructures

Romuald Houdré, Marc Ilegems, Ursula Oesterle, Henri Benisty

Regular periodic structures with large refractive index contrast are often called photonic crystals and may exhibit photonic bandgap behaviour. Planar waveguide 2D and 1D periodic microstructures exhibiting photonic bandgap behaviour are likely to be usefu ...

1999

Demonstration of a far-infrared streak camera

Marcel Drabbels

An atomic infrared (IR) streak camera is demonstrated that operates in the mid- and far-infrared (lambda = 5-85 um), web beyond the long wavelength cutoff of conventional streak cameras. The temporal and spectral characteristics of the streak camera are de ...

Institute of Electrical and Electronics Engineers1998

Thin film pyroelectric array as a detector for an infrared gas spectrometer

Paul Muralt

We demonstrate the implementation of a thin film pyroelectric array as a detector in an infrared gas spectrometer. The 1 x 50 element array is integrated onto a silicon chip with a sol-gel deposited zirconium modified lead titanate film (PZT) as the pyroel ...

1998

Dynamical charge tensors and infrared spectrum of amorphous SiO2

Alfredo Pasquarello, Roberto Car

Using a model structure consisting of a network of corner sharing tetrahedra, we calculate the infrared spectrum of amorphous SiO2 within a first-principles approach and find good agreement with experiment both for the positions and the intensities of the ...

1997

Streak camera operating in the mid infrared

Marcel Drabbels

An atomic streak camera has been constructed that operates from the near to the far infrared. The photocathode used in conventional streak cameras for the conversion of photons to electrons has been replaced by gas-phase atoms in a Rydberg state. The low b ...

Optical Society of America1997