Quantum Dot Waveguides

Introduction Realization of ultrahigh-density photonic integrated circuits requires the ability to guide light at subdiffraction limit dimensions without extensive loss due to sharp waveguide bending. Existing technologies may be difficult to integrate with optical and electronic components on chip, and cannot maintain low-loss guiding at sharp junctions. Waveguides using a gain-enabled material that can be easily fabricated and integrated on a chip would be an important addition to a nanophotonic toolbox. Technology description UW researchers have developed a novel approach to making very small waveguides. The waveguides are built by allowing quantum dots to self-assemble on a substrate. The quantum dots are illuminated by a pump light source which excited electrons to the conduction band and results in optical gain. This technology is particularly interesting because the quantum dot waveguides can be easily integrated onto a chip with other optical components. Business opportunity This technology has the potential to make an important contribution to ultra-high density photonic integrated circuits, which have applications in optical computing, optical signal processing, and optical communications. Stage of development Research in this area is ongoing. Intellectual property position The University of Washington has filed a provisional patent on this technology.

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