ISAS-Kolloquium: Mie-resonant semiconductor nanostructures as a platform for functional nanophotonics

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ISAS-Kolloquium: Mie-resonant semiconductor nanostructures as a platform for functional nanophotonics

Montag, 14. August 2017 // 14.00

isas, Leibniz-Institut für Analytische Wissenschaften

Schwarzschildstraße 8, 12489 Berlin
Raum 218

Dr. Isabelle Philippa Staude
Functional Photonic Nanostructures Junior Research Group, Institute of Applied Physics, Friedrich-Schiller-Universität Jena

All-dielectric nanoparticles with a high refractive index support strong localized electric and magnetic multipolar Mie-type resonances. Using the capabilities of modern nanotechnology, these resonances can be tuned by the size, shape, material composition, and arrangement of the nanoresonators. Furthermore, dielectric nanoresonators exhibit very low absorption losses at optical frequencies. Based on these unique optical properties, high-index dielectric nanoresonators represent versatile building blocks of resonant metasurfaces and nanoantennas with tailored linear and nonlinear optical properties.

This talk will provide an overview of our recent advances in controlling the generation and propagation of light with dielectric metasurfaces and nanoantennas composed of silicon or other high-index semiconductor materials.

On the one hand, metasurfaces composed of dielectric Mie-resonators can impose a spatially variant phase shift onto an incident light field, thereby providing control over its wave front. Based on the simultaneous excitation of electric and magnetic dipole resonances, the nanoresonators can be tailored to emulate the behavior of the forward-propagating elementary wavelets known from Huygens’ principle. This concept allows for the realization of metasurfaces with high transmittance efficiency, full phase coverage, and a polarization insensitive response.

On the other hand, dielectric Mie-resonators can be employed as optical nanoantennas, which have the ability to enhance the interaction of light with nanoscale matter. I will discuss two prominent application examples of this concept, namely the manipulation of spontaneous emission by semiconductor nanoantennas and refractive index sensing of low concentrations of streptavidin using arrays of resonant silicon nanocylinders.