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Investigation on Metal Reflection Coatings of Free-space Optical Components with Integrated Fan-out DOE's

Publication date 2003
B-Phot Authors Jurgen Van Erps, Michael Vervaeke, Erik Stijns, Hugo Thienpont
Citation
J. Van Erps, L. Desmet, M. Vervaeke, E. Stijns, and H. Thienpont, “Investigation on Metal Reflection Coatings of Free-space Optical Components with Integrated Fan-out DOE’s,” in Proc. Symp. IEEE/LEOS Benelux, 2003, pp. 277–280.
Abstract We have designed a phase-only DOE with 1-to-9 beam fan-out functionality for optical beam distribution in an existing free-space otical interconnect (OI) component. However, due to the oblique angles of higher order diffracted beams, the condition of total internal reflection is not always met. To solve the problem, we propose to use an aluminum coating on top of the DOE and the deflecting prism sidewall. We compare experimentally a metal coated and uncoated replicat of the OI component and investigate the polarization dependence of the reflectivity of the coating. We consider gold as a coating for future experiments, since the imaginary part of its complex index of refraction is smaller than aluminum's and therefore a smaller fraction of the incident light will be absorbed.
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