Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore.
Opt Lett. 2011 May 1;36(9):1731-3. doi: 10.1364/OL.36.001731.
A highly sensitive miniature photonic crystal fiber refractive index sensor based on field mode excitation is presented. The sensor is fabricated by melting one end of a photonic crystal fiber into a rounded tip and splicing and collapsing the other end with a single-mode fiber. The rounded tip is able to induce cladding mode excitation, which resulted in an additional phase delay. Linear response of 262.28 nm/refractive index unit in the refractive index range of 1.337 to 1.395 is obtained for the physical length of a 953 μm sensor. The sensor is also shown to be insensitive to environmental temperature.
提出了一种基于场模激励的高灵敏度微型光子晶体光纤折射率传感器。该传感器通过将光子晶体光纤的一端熔化成圆端，并将另一端与单模光纤进行拼接和熔缩来制作。圆端能够诱导包层模激励，从而导致附加的相延迟。对于物理长度为 953μm 的传感器，在折射率范围为 1.337 至 1.395 内，获得了 262.28nm/折射率单位的线性响应。该传感器还表现出对环境温度不敏感。
