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

Continuous-relief fan-out elements with optimized fabrication tolerances

Ehbets, Peter ; Rossi, Markus ; Herzig, Hans-Peter

In: Optical Engineering, 1995, vol. 34, no. 12, p. 3456-3464

The design of kinoform fan-out elements with high efficiency and reduced sensitivity to vertical profile scaling errors is presented. We start from a high-efficiency continuous-phase fan-out solution and optimize the position of the 0-2π transitions in the phase function, in order to achieve a high fabrication-error tolerance. The sensitivity of Fourier-transform and focusing fan-out elements to...