Broadband single molecule SERS detection designed by warped optical spaces

Peng Mao, Changxu Liu, Gael Favraud, Qiang Chen (), Min Han, Andrea Fratalocchi () and Shuang Zhang ()
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Peng Mao: University of Birmingham
Changxu Liu: University of Birmingham
Gael Favraud: PRIMALIGHT, Faculty of Electrical Engineering, Applied Mathematics and Computational Science, KAUST
Qiang Chen: Nanjing University
Min Han: Nanjing University
Andrea Fratalocchi: PRIMALIGHT, Faculty of Electrical Engineering, Applied Mathematics and Computational Science, KAUST
Shuang Zhang: University of Birmingham

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Engineering hotspots is of crucial importance in many applications including energy harvesting, nano-lasers, subwavelength imaging, and biomedical sensing. Surface-enhanced Raman scattering spectroscopy is a key technique to identify analytes that would otherwise be difficult to diagnose. In standard systems, hotspots are realised with nanostructures made by acute tips or narrow gaps. Owing to the low probability for molecules to reach such tiny active regions, high sensitivity is always accompanied by a large preparation time for analyte accumulation which hinders the time response. Inspired by transformation optics, we introduce an approach based on warped spaces to manipulate hotspots, resulting in broadband enhancements in both the magnitude and volume. Experiments for single molecule detection with a fast soaking time are realised in conjunction with broadband response and uniformity. Such engineering could provide a new design platform for a rich manifold of devices, which can benefit from broadband and huge field enhancements.

Date: 2018
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DOI: 10.1038/s41467-018-07869-5

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