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Nano Lett. 2006 Nov;6(11):2549-53.

Subdiffraction photon guidance by quantum-dot cascades.

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  • 1Department of Electrical Engineering, Department of Physics, University of Washington, Seattle, Washington 98195, USA.


We report on a waveguide composed of a cascade of gain-enabled quantum dots with subwavelength dimensions. Fabrication is demonstrated through DNA-mediated self-assembly and a two-layer molecular self-assembly process that enables rapid prototyping. The device, which is identified with fluorescence microscopy and tested by optical near field detection, allows optical signal transfer at a well-defined wavelength in flexible routing geometry, such as straight paths and 90 degrees bends. The structure serves as a critical building block for nanophotonic systems with high integration density.

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