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4 papers · 1 filter
Radially Self-Accelerating Beams
Christian Vetter, Toni Eichelkraut, Marco Ornigotti +2
We report on optical non-paraxial beams that exhibit a self-accelerating behavior in radial direction. Our theory shows that those beams are solutions to the full scalar Helmholtz…
Plasmon enhanced upconversion luminescence near gold nanoparticles - Simulation and analysis of the interactions
Stefan Fischer, Florian Hallermann, Toni Eichelkraut +6
We investigate plasmon resonances in gold nanoparticles to enhance the quantum yield of upconverting materials. For this purpose, we use a rate equation model that describes the up…
Controlling the Dynamics of Quantum Mechanical Systems Sustaining Dipole-Forbidden Transitions via Optical Nanoantennas
Robert Filter, Stefan Mühlig, Toni Eichelkraut +2
We suggest to excite dipole-forbidden transitions in quantum-mechanical systems by using appropriately designed optical nanoantennas. The antennas are tailored such that their near…
Unidirectional Invisibility induced by PT-Symmetric Periodic Structures
Zin Lin, Hamidreza Ramezani, Toni Eichelkraut +3
We show that parity-time (PT) symmetric Bragg periodic structures, near the spontaneous PT - symmetry breaking point, can act as unidirectional invisible media. In this regime, the…