Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)


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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