title: An integrated photoluminescence sensing platform using a single-multi-mode fiber coupler-based probe.
abstract: We demonstrate an integrated fiber optic photoluminescence sensing platform using a novel single-multi-mode fiber coupler (SMFC)-based probe with high collection efficiency for fluorescence signals. The SMFC, prepared using fused biconical taper technology, not only transmits excitation light, but also collects and transmits fluorescence. The entire system does not use complex optical components and rarely requires optical alignment. The simple structure of the SMFC considerably improves the light transmission efficiency, signal-to-noise ratio, and sensitivity of the system. Theoretical and experimental results show that the proposed probe increases the collection efficiency by more than eight-fold compared with a bifurcated fiber probe. The performance of the proposed probe was experimentally evaluated by measuring the fluorescence spectra of well-known targets and a fresh Tall Fescue leaf.
authors.affiliation: School of Environment and Natural Resources, Renmin University of China, No.59, Zhongguancun, Haidian, Beijing 100872, China. longf04@ruc.edu.cn.
authors.forename: Feng
authors.initials: F
authors.lastname: Long
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA. Zhuanna00@mails.thu.edu.cn.
authors.forename: Anna
authors.initials: A
authors.lastname: Zhu
authors.affiliation: School of Environment, Tsinghua University, No.1, Tsinghua Yuan, Haidian, Beijing 100084, China. hanchang@tsinghua.edu.cn.
authors.forename: Hanchang
authors.initials: H
authors.lastname: Shi
mesh_terms: D002232:Carbocyanines / Q000737:chemistry; D005336:Fiber Optic Technology / Q000379:methods*; D049449:Luminescence; D055100:Optical Fibers; D013050:Spectrometry, Fluorescence
chemical_list: C098793:CY5.5 cyanine dye; D002232:Carbocyanines