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Large‐Area Hybrid Plasmonic Optical Cavity (HPOC) Substrates for Surface‐Enhanced Raman Spectroscopy
Author(s) -
Liu Bowen,
Yao Xu,
Chen Shu,
Lin Haixin,
Yang Zhilin,
Liu Shou,
Ren Bin
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201802263
Subject(s) - materials science , surface enhanced raman spectroscopy , raman spectroscopy , plasmon , substrate (aquarium) , fabrication , optoelectronics , nanotechnology , optics , raman scattering , physics , medicine , oceanography , alternative medicine , pathology , geology
Surface‐enhanced Raman spectroscopy (SERS) is receiving increasing interests owing to its high sensitivity and molecular fingerprint information. The practical application of SERS relies on the highly enhancing, uniform, reproducible, and affordable substrates. A novel gap‐free 3D SERS substrate with unique hybrid plasmonic and optical cavity (HPOC) structures to improve the uniformity and reduce the fabrication cost while maintaining the high SERS enhancement is introduced here. The gold HPOC structures are fabricated by the tunable holographic lithography followed by gold deposition and can be conveniently optimized for a specific excitation wavelength by tuning the cavity length. The substrate shows average enhancement factor larger than 10 6 and excellent uniformity with a standard deviation smaller than 6.7%. Together with the capability to be fabricated on a flexible polyethylene substrate, the HPOC SERS substrate is promising for practical applications.