Université de Neuchâtel

Optimized staircase profiles for diffractive optical devices made from absorbing materials

Nöhammer, Bernd ; David, Christian ; Gobrecht, Jens ; Herzig, Hans-Peter

In: Optics Letters, 2003, vol. 28, no. 13, p. 1087-1089

We report on the optimization of staircase grating profiles for the case of absorbing grating materials. Using a simple numerical algorithm, we determined the grating parameters, maximizing the first-order diffraction efficiency for different numbers of staircase steps. The results show that there is a significant difference between the staircase profiles for nonnegligible and negligible...

Université de Neuchâtel

Application of the boundary-element method to the interaction of light with single and coupled metallic nanoparticles

Rockstuhl, Carsten ; Salt, Martin Guy ; Herzig, Hans-Peter

In: Journal of the Optical Society of America A, 2003, vol. 20, no. 10, p. 1969-1973

The boundary-element method is applied to the interaction of light with resonant metallic nanoparticles. At a certain wavelength, excitation of a surface plasmon takes place, which leads to a resonantly enhanced near-field amplitude and a large scattering cross section. The resonance wavelength for different scatterer geometries is determined. Alteration of the scattering properties in the...