Université de Neuchâtel

Design and modeling of a miniature system containing micro-optics

Lindlein, Norbert ; Herzig, Hans-Peter

In: Gradient Index, Miniature, and Diffractive Optical Systems II (Proceedings of SPIE), 2001, vol. 4437, p. 1-13

The design and modeling of micro-optical systems is still a challenging task because classical methods like ray tracing do not take into account diffraction effects and other coherent effects which appear e.g. in the presence of micro-optical array systems. On the other side, there exist scalar or rigorous diffraction theories to model optical systems. But they are also limited in their...

Université de Neuchâtel

Wavelength-dependent optical force on elliptical silver cylinders at plasmon resonance

Rockstuhl, Carsten ; Herzig, Hans-Peter

In: Optics Letters, 2004, vol. 29, no. 18, p. 2181-2183

We use rigorous diffraction theory to analyze the force on elliptical cylinders made from silver as a function of the elongation. We find that, when the wires are illuminated at the plasmon wavelength and placed in a highly focused Gaussian beam, they are attracted toward the optical axis if the waist of the laser is behind the wire and repelled if the waist is before the wire. Also, the force...

Université de Neuchâtel

Microlens systems for fluorescence detection in chemical microsystems

Roulet, Jean-Christophe ; Völkel, Reinhard ; Herzig, Hans-Peter ; Verpoorte, Elisabeth ; de Rooij, Nicolaas F. ; Dändliker, René

In: Optical Engineering, 2001, vol. 40, no. 5, p. 814-821

Micro-optical systems based on refractive microlenses are investigated. These systems are integrated on a chemical chip. They focus an excitation beam into the detection volume (microliter or even submicroliter scale) and collect the emitted light from fluorescent molecules. The fluorescence must be carefully separated by spatial and spectral filtering from the excitation. This paper presents the...

Université de Neuchâtel

Fabrication technologies for micro-optical elements with arbitrary surfaces

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

In: Micromachining Technology for Micro-Optics (Proceedings of SPIE), 2000, vol. 4179, p. 65-72

We present a comparison of three different technologies for the fabrication of micro-optical elements with arbitrary surfaces. We used direct laser writing in photoresist, binary mask lithography in combination with reactive ion etching in fused silica, and High-Energy- Beam-Sensitive (HEBS) glass graytone lithography in photoresist. We analyzed the efficiencies and the deflection angles of...

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.

Université de Neuchâtel

Microlens array imaging system for photolithography

Völkel, Reinhard ; Herzig, Hans-Peter ; Nussbaum, Philippe ; Dändliker, René ; Hugle, William B.

In: Optical Engineering, 1999, vol. 35, no. 1, p. 3323-3330

A micro-optical system is proposed that uses a stack of four microlens arrays for 1:1 imaging of extended object planes. The system is based on the concept of multiple-aperture imaging. A compact system is presented that is remarkable in that it provides a diffraction-limited resolution of 3 µm for unlimited object and image areas. Resolution of 5 µm has been demonstrated for an area of 20 ×...