Open AccessSurface enhanced fluorescence by metallic nano-apertures associated with stair-gratings
Author(s) -
R. Yuanying Chou,
Guantao Li,
Yuqing Cheng,
Yu He,
Jingyi Zhao,
Zhengmin Cao,
Qihuang Gong,
Guowei Lü
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.019567
Subject(s) - materials science , optics , fluorescence , fluorescence correlation spectroscopy , grating , fluorescence spectroscopy , fluorescence cross correlation spectroscopy , diffraction grating , optoelectronics , physics
Metallic nano-apertures associated with stair-gratings are proposed for surface enhanced fluorescence with high excitation enhancement and narrow emission beaming effect. Fluorescence correlation spectroscopy method was utilized to analyze the fluorescence trace and fluorescence enhancement, and the angular patterns of fluorescent emission were measured with the back focal plane imaging method. The stair-grating presents a strong optical response which covering well both the excitation and the emission bands of the photoluminescence process. Such high enhancement and narrow directionality by the stair-gratings would enable the detection of single molecules with low numerical aperture objective effectively.