title: Nonlinear photonic diode behavior in energy-graded core-shell quantum well semiconductor rod.
abstract: Future technologies require faster data transfer and processing with lower loss. A photonic diode could be an attractive alternative to the present Si-based electronic diode for rapid optical signal processing and communication. Here, we report highly asymmetric photonic diode behavior with low scattering loss, from tapered core-shell quantum well semiconductor rods that were fabricated to have a large gradient in their bandgap energy along their growth direction. Local laser illumination of the core-shell quantum well rods yielded a huge contrast in light output intensities from opposite ends of the rod.
authors.affiliation: Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology , Daejeon 305-701, Korea.
authors.forename: Suk-Min
authors.initials: SM
authors.lastname: Ko
authors.forename: Su-Hyun
authors.initials: SH
authors.lastname: Gong
authors.forename: Yong-Hoon
authors.initials: YH
authors.lastname: Cho
keywords: GaN/InGaN core−shell quantum well; Photonic diode; asymmetric waveguide; nonlinear