Nanofluidic tuning of photonic crystal circuits
By integrating soft-lithography-based nanofluidics with silicon nanophotonics, we demonstrate dynamic, liquid-based addressing and high Δn/n (~0.1) refractive index modulation of individual features within photonic structures at subwavelength length scales. We show ultracompact tunable spectral filtering through nanofluidic targeting of a single row of holes within a planar photonic crystal. We accomplished this with an optofluidic integration architecture comprising a nanophotonic layer, a nanofluidic delivery structure, and a microfluidic control engine. Variants of this technique could enable dynamic reconfiguration of photonic circuits, selective introduction of optical nonlinearities, or delivery of single molecules into resonant cavities for biodetection.
Additional Information© 2007 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was carried out at the Center for Optofluidic Integration at the California Institute of Technology. Funding for the center is provided by the Defense Advanced Research Projects Agency under the University Photonics Research Centers Program.
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