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Université de Neuchâtel

CO2 isotope sensor using a broadband infrared source, a spectrally narrow 4.4 μm quantum cascade detector, and a Fourier spectrometer

Hofstetter, Daniel ; Di Francesco, Joab F. ; Hvozdara, Lubos ; Herzig, Hans-Peter ; Beck, Mattias

In: Applied Physics B: Lasers and Optics, 2010, vol. 103, no. 4, p. 967-970

We report a prototype CO2 gas sensor based on a simple blackbody infrared source and a spectrally narrow quantum cascade detector (QCD). The detector absorption spectrum is centered at 2260 cm−1 (4.4 μm) and has a full width at half maximum of 200 cm−1 (25 meV). It covers strong absorption bands of two spectrally overlapping CO2 isotopomers, namely...

Université de Neuchâtel

High Resolution Interference Microscopy: A Tool for Probing Optical Waves in the Far-Field on a Nanometric Length Scale

Rockstuhl, Carsten ; Märki, Iwan ; Scharf, Toralf ; Salt, Martin Guy ; Herzig, Hans-Peter ; Dändliker, René

In: Current Nanoscience, 2006, vol. 2, no. 4, p. 337-350

High Resolution Interference Microscopy (HRIM) is a technique that allows the characterization of amplitude and phase of electromagnetic wave-fields in the far-field with a spatial accuracy that corresponds to a few nanometers in the object plane. Emphasis is put on the precise determination of topological features in the wave-field, called phase singularities or vortices, which are spatial...

Université de Neuchâtel

Design and Fabrication of Highly Efficient Fan-Out Elements

Herzig, Hans-Peter ; Prongué, Damien ; Dändliker, René

In: Japanese Journal of Applied Physics, 1990, vol. 29, no. 7, p. 1307-1309

This paper reports the calculation and fabrication of periodic phase structures fan-out elements with a theoretical conversion efficiency close to 100 percent and perfect uniformity. An efficiency of 92 percent was measured for a smooth kinoform structure fabricated in photoresist by laser beam writing lithography.

Université de Neuchâtel

Concept and Demonstration of Individual Probe Actuation in Two-Dimensional Parallel Atomic Force Microscope System

Akiyama, Terunobu ; Aeschimann, Laure ; Chantada, Laura ; de Rooij, Nicolaas F. ; Heinzelmann, Harry ; Herzig, Hans-Peter ; Manzardo, Omar ; Meister, André ; Polesel-Maris, Jérôme ; Pugin, Raphaël ; Staufer, Urs ; Vettiger, Peter

In: Japanese Journal of Applied Physics, 2007, vol. 46, no. 9B, p. 6458-6462

A concept of an array actuator that is used to control the tip–sample separation of cantilevers in a two-dimensional (2D) probe array scanning system is proposed in this article. The feasibility of the concept is demonstrated with a 10×10 array actuator with 500 µm xy-pitches. The array actuator is made by slicing a bulk piezoceramic block. The obtained maximum actuation of a single...

Université de Neuchâtel

Micro-optical elements with arbitrary surfaces

Schilling, Andreas ; Nussbaum, Philippe ; Philipoussis, Irene ; Herzig, Hans-Peter ; Rossi, Markus ; Kley, Ernst-Bernhard

In: Diffractive Optics and Micro-Optics (DOMO), 2000, p. 234-236

We present a comparison of three different technologies for the fabrication of micro-optical elements with arbitrary surfaces. We used direct laser writing, binary mask lithography incombination with reactive ion etching, and graytone lithography.