The invention discloses an
optical fiber surface enhanced raman probe based on
surface plasmon effect and a manufacturing method thereof. A layer of periodic
metal structure is adhered to a grinded
optical fiber end surface. The manufacturing method comprises the following steps: spin-
coating a PS
microsphere array on a base plate, partially
etching and a
coating a
metal film on the top of the PSmicrosphere to form a hemispherical
metal structure, spin-
coating polymer on the surface of the hemispherical metal surface and curing, and removing substrate; curing the obtained film with the
optical fiber end surface with glue, completely removing the PS
microsphere after curing, performing RIE
etching to regulate the geometric dimension of the metal structure for enabling resonant
wavelength of the metal structure to be consistent with excited
laser wavelength, and only leaving a metal hemispherical array on the top of the optical
fiber. A to-be-measured sample is adsorbed on the surface of the metal hemispherical array, a
light source couples and enters from one end of the optical
fiber, and the metal structure is irradiated from the inner part of the optical
fiber, so that a measurable raman
signal is generated by
laser under action of the metal structure, and the
laser is output and analyzed by a
spectrograph after being collected by the optical fiber. The optical fiber surfaceenhanced raman probe is simple in structure and is suitable for
processing production.