Abstract
Conference Title: 2019 Conference on Lasers and Electro-Optics (CLEO) Conference Start Date: 2019, May 5 Conference End Date: 2019, May 10 Conference Location: San Jose, CA, USA We demonstrate a lithography-free super absorbing metasurface consisting of hybrid Ag-Au nanoantennas with sub-20-nm nanogaps for surface enhanced Raman spectroscopy sensing to tackle the emerging drug-abuse challenge. © 2019 The Author(s)