title: A refractometer based on a micro-slot in a fiber Bragg grating formed by chemically assisted femtosecond laser processing.
abstract: A liquid core waveguide as a refractometer is proposed. Microtunnels were created in standard optical fiber using tightly focused femtoscond laser inscription and chemical etching. A 1.2(h)x125(d) x500(l) mum micro-slot engraved along a fiber Bragg grating (FBG) was used to construct liquid core waveguide by filling the slot with index matching oils. The device was used to measure refractive index and sensitivity up to 10- 6/pm was obtained.
authors: Kaiming
authors: K
authors: Zhou
authors: Yicheng
authors: Y
authors: Lai
authors: Xianfeng
authors: X
authors: Chen
authors: Kate
authors: K
authors: Sugden
authors: Lin
authors: L
authors: Zhang
authors: Ian
authors: I
authors: Bennion