Determination of trace chromium (VI) using a hollow-core metal-cladding optical waveguide sensor Wang, Yang ; Huang, Meizhen ; Guan, Xiangyu ; Cao, Zhuangqi ; Chen, Fan ; Wang, Xianping Abstract Publication: Optics Express Pub Date: December 2013 DOI: 10.1364/OE.21.031130 Bibcode: 2013OExpr..2131130W