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We experimentally demonstrate spectrally broad (λ0=1200–1800 nm) in-plane negative diffraction of SPPs in an array of plasmonic channel waveguides with negative mutual coupling resulting in negative refraction on the array's interface and refocusing in an adjacent metal layer.
We report a fundamental understanding of the mechanism for enhanced light absorption in sparse semiconductor nanowire arrays and design methods to achieve near-unity broadband absorption, demonstrated by GaAs nanowire arrays on a Si substrate. The sparse nanowire arrays absorb strongly into localized radial modes of individual nanowires, enabled by efficient scattering of incident light from neighboring...
High confinement in plasmonic waveguides usually comes along with high loss. We present experiments on a new approach, which allows to tune adiabatically between high confinement and low loss waveguides, connected to optical Yagi-style antennas.
Plasmonics has provided researchers new means to control optical dispersion and light localization at nanoscale dimensions. Plasmonic design approaches are yielding building blocks for chip-based optical components as well as optical metamaterials and light trapping structures for improved efficiency in thin solar cells.
Supermode Si/InGaAsP hybrid lasers with a varying-width Si waveguide have been fabricated and shown to be superior to those lasers with a uniform-width Si waveguide. Edge emission images demonstrate mode evolution.
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