Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.


Low-Loss Highly Tolerant Flip-Chip Couplers for Hybrid Integration of Si3N4 and Polymer Waveguides

(full pdf)

Jinfeng Mu, Theonitsa Alexoudi, Yean-Sheng Yong, Sergio A. Vázquez-Córdova, Meindert Dijkstra, Kerstin Wörhoff, Jeroen Duis, and Sonia M. García-Blanco
IEEE Photonics Technology Letters
vol. 28, issue 23, december 1, 2016

In this letter, low-loss and highly fabrication-tolerant flip-chip bonded vertical couplers under single-mode condition are demonstrated for the integration of a polymer waveguide chip onto the Si3N4/SiO2 passive platform. The passively aligned vertical couplers have a lateral misalignment between polymer and Si3N4 waveguide cores of +/- 1.25 μm . Low-loss operation has been experimentally demonstrated over a wide spectral window of 1480-1560 nm, with measured coupler losses below 0.8 dB for Si3N4 taper angles below 1.2°, in good agreement with the calculated values. Furthermore, thermal shock test results show less than 0.1 dB degradation, indicating a robust coupling performance.
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