February 20, 2017

Turning nano-antennas on the right side

In-plane nano-gap antenna-arrays with giant enhancement in NanoLetters.

Optical nano-antennas are ideal to enhance light-matter interactions at the nanometer scale. Yet in most designs, the region of maximum field localization and enhancement, the “hotspot”, is not readily accessible since it is buried into the nanostructure. In a recent collaboration between EPFL in Lausanne, Fresnel Institute in Marseille and ICFO groups led by ICREA Professors at ICFO Maria Garcia-Parajo and Niek van Hulst, researchers present a new nanofabrication technique that applies planarization, etch back and template stripping to expose the excitation hotspot at the surface. The large flat surface arrays of in-plane nano-antennas feature gaps as small as 10 nm with sharp edges, excellent reproducibility and full surface accessibility of the hotspot confined region. The novel fabrication approach drastically improves the optical performance of plasmonic nano-antennas to yield giant fluorescence enhancement factors, together with nanoscale detection volumes in the 20 zepto-liter range. The method is fully scalable, adaptable to a broad wide range of antenna designs and apt to a broad range of applications ranging from large-scale ultra-sensitive sensor chips, to microfluidics and live cell membrane investigations.

The work was recently published in NanoLetters and carried out under the EU FP7 framework project NanoVista – Photonic Antennas for Biology.