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

High-carrier-frequency fan-out gratings fabricated by total internal reflection holographic lithography

Ehbets, Peter ; Herzig, Hans-Peter ; Kuittinen, Markku ; Clube, Francis S. M. ; Darbellay, Yves

In: Optical Engineering, 1995, vol. 34, no. 8, p. 2377-2383

Total internal reflection (TIP) holographic lithography is applied to the fabrication of binary diffractive optical elements with submicrometer surface relief features. The recording conditions for the intermediate TIR volume hologram, used for high-resolution proximity printing, are discussed. In particular, the fabrication of efficient high-carrier-frequency fan-out gratings is considered and...