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10 May 2012 On-chip multiplexing concept for silicon photonic MZI biosensor array
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We present a novel wavelength multiplexing concept for an integrated label-free biosensor array employing silicon photonic Mach-Zehnder interferometers as sensors. Microring resonators act as wavelength selective elements in the near infrared wavelength region. The radii of the microring resonators differ to obtain resonance wavelengths that are allocated equally within the free spectral range. By choosing a wavelength where a certain microring is in resonance, an individual interferometer is addressed. Wire Bragg gratings terminate the interferometer arms and reflect the light back. The ring resonator, which dropped the light, now couples the light back into the input waveguide, where it propagates in opposite direction. A standard fiber optic circulator between the tunable laser source and the in/output separates the incoming from the outgoing light. In this work, the characteristics of the entire device are discussed. The design based on FEM and 3D-FDTD simulations as well as measurements of the nanophotonic key components namely micro ring resonators, Mach-Zehnder interferometers, and photonic wire Bragg gratings are presented. Measurements of combinations of the key components demonstrate the applicability of the reflectors in photonic circuits. Finally, for proof-of-concept, we successfully performed experiments with fluids of different refractive index differences rinsed over the sensor array.
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P. Muellner, R. Bruck, M. Baus, M. Karl, T. Wahlbrink, and R. Hainberger "On-chip multiplexing concept for silicon photonic MZI biosensor array", Proc. SPIE 8431, Silicon Photonics and Photonic Integrated Circuits III, 84310S (10 May 2012);

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