摘要: A hollow-core photonic crystal fiber (HC-PCF)-based gas sensor is proposed and numerically investigated through the finite element method. To obtain higher relative sensitivity coefficient γ and the better sensing properties of th... 展开 A hollow-core photonic crystal fiber (HC-PCF)-based gas sensor is proposed and numerically investigated through the finite element method. To obtain higher relative sensitivity coefficient γ and the better sensing properties of the gas sensor, the floriated structure of the central hole of HC-PCF is optimized. Numerical investigation shows that γ is high and relatively stable to changes of the diameter of air holes in a wide range of wavelength of 1.5-1.7μm, which is very beneficial for sensor fabrication. A lower confinement loss and the flatness are also exhibited with the HC-PCF. And the highest γ of 0.9998 of the floriated structure of the central hole can be obtained than the circular ones of 0.9435 at the wavelength of 1.56μm. 收起