We propose two different designs of slotted photonic crystal nanofiber cavities (SPCNCs), dielectric-mode (DM) SPCNC and air-mode (AM) SPCNC, and numerically investigate their refractive index sensing performances when they are immersed in an aqueous environment. By using the three-dimensional finite-difference time-domain method, we demonstrate that the DM-SPCNC (AM-SPCNC) simultaneously possesses a high quality factor of 1.49 × 10 7 (7.96 × 10 6 ) and a high sensitivity of 598 nm/refractive index unit (RIU) (423 nm/RIU) at the resonant wavelength of 1525.94 nm (1585.06 nm), yielding a figure of merit as high as 5.8 × 10 6 RIU −1 (2.1 × 10 6 RIU −1 ). Moreover, the mode volume of the DM-SPCNC’s (AM-SPCNC’s) fundamental resonant mode is found to be as small as 0.12 ( λ / n ) 3 (0.24 ( λ / n ) 3 ), resulting in a very compact effective sensing area. With these distinct features, we ...

中文翻译：

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用于折射率传感的介电模式和空气模式开缝光子晶体纳米纤维腔的设计

我们提出了缝隙光子晶体纳米纤维腔（SPCNC）的两种不同设计，介电模（DM）SPCNC和空气模（AM）SPCNC，并数值研究了它们浸入水性环境时的折射率传感性能。通过使用三维有限差分时域方法，我们证明了DM-SPCNC（AM-SPCNC）同时具有1.49×10 7（7.96×10 6）的高质量因子和598 nm的高灵敏度。共振波长为1525.94nm（1585.06nm）的/折射率单位（RIU）（423nm / RIU），品质因数高达5.8×10 6 RIU -1（2.1×10 6 RIU -1）。此外，发现DM-SPCNC（AM-SPCNC）基本谐振模式的模式体积小至0.12（λ/ n）3（0.24（λ/ n）3），从而实现了非常紧凑的有效感应区域。