13 May 2010 A superprism-based photonic crystal demultiplexer in nearly-perfect collimation conditions
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Superprism phenomena in planar photonic crystals (PhCs) can be used for the realization of compact demultiplexers. Yet, strong dispersion is most often accompagnied by strong diffraction. The design, fabrication, and experimental characterization of a PhC demultiplexer is presented. A special care is taken to excite the equi-frequency surfaces in dispersive and simultaneously nearly-collimated regions. The structure is fabricated on a SOI substrate using e-beam lithography and RIE etching. With four output channels, its footprint is 2800μm2. It is characterized by a -16 dB level of crosstalk around λ = 1550 nm, with 2dB loss.
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Eric Cassan, Eric Cassan, Damien Bernier, Damien Bernier, Anatole Lupu, Anatole Lupu, Xavier Le Roux, Xavier Le Roux, Delphine Marris-Morini, Delphine Marris-Morini, Laurent Vivien, Laurent Vivien, } "A superprism-based photonic crystal demultiplexer in nearly-perfect collimation conditions", Proc. SPIE 7713, Photonic Crystal Materials and Devices IX, 77130J (13 May 2010); doi: 10.1117/12.853784; https://doi.org/10.1117/12.853784

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