Broadband single molecule SERS detection designed by warped optical spaces

Peng Mao, Changxu Liu, Gael Favraud, Qiang Chen, Min Han, Andrea Fratalocchi*, Shuang Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

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.

Original languageEnglish
Article number5428
Number of pages8
JournalNature Communications
Volume9
Issue number1
Early online date21 Dec 2018
DOIs
Publication statusPublished - Dec 2018
Externally publishedYes

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