Abstract: An optofluidic antenna device (100) for shaping a light field of sample light emitted or scattered by a sample (1) comprises a substrate (10) and a liquid layer (20) being supported by the substrate (10) and being arranged for accommodating the sample (1) to be investigated between a first liquid surface (21) facing to the substrate (10) and a second liquid surface (22) opposite to the first liquid surface (21), wherein a thickness of the liquid layer (20) between the first and second liquid surfaces (21, 22) and refractive indices of the substrate (10) and the liquid layer (20) are selected such that an optofluidic antenna is formed, which is capable of directing the sample light mainly towards the substrate (10), and a gas volume (30) is arranged above the liquid layer (20), so that the second liquid surface (22) is formed as a liquid-gas-interface.

Abstract: An antenna structure for directing light is disclosed. The antenna structure includes a reflector having a reflective surface and a ring-shaped dielectric grating arranged at the reflective surface and extending concentrically along a center axis perpendicular to the reflective surface and forming an omnidirectional reflector surrounding a low-index center portion of the ring-shaped dielectric grating. The antenna structure is configured to outcouple light emitted inside the low-index center portion through an upper end of the dielectric grating along the center axis with a Gaussian beam profile projection efficiency ? of at least 65%. A light emitting device and a method for designing an antenna structure are also disclosed.