Appl Opt. 2023 Mar 10;62(8):1992-1998. doi: 10.1364/AO.482927.
This paper discusses the details about the fabrication of single-mode fiber (SMF)- and multi-mode fiber (MMF)-based core-offset sensor structures for biomolecules detection. SMF-MMF-SMF (SMS) and SMF-core-offset MMF-SMF (SMS structure with core-offset) are proposed in this paper. In the conventional SMS structure the incident light is introduced from the SMF to the MMF and then passes through the MMF to the SMF. However, in the SMS-based core offset structure (COS) the incident light is introduced from the SMF to the core offset MMF and then passes through the MMF to the SMF, and more incident light leaks at the fusion point between the SMF and the MMF. This structure causes more incident light to leak out from the sensor probe, forming evanescent waves. By analyzing the transmitted intensity, the performance of COS can be improved. The results show that the structure of the core offset has great potential for the development of fiber-optic sensors.
本文讨论了用于生物分子检测的单模光纤 (SMF) 和多模光纤 (MMF) 基底芯偏移传感器结构的制作细节。本文提出了 SMF-MMFSMF（SMS）和 SMF-芯偏移 MMF-SMF（带芯偏移的 SMS 结构）。在传统的 SMS 结构中，入射光从 SMF 引入到 MMF，然后通过 MMF 传输到 SMF。然而，在基于 SMS 的芯偏移结构 (COS) 中，入射光从 SMF 引入到芯偏移 MMF，然后通过 MMF 传输到 SMF，并且更多的入射光在 SMF 和 MMF 的融合点泄漏。这种结构导致更多的入射光从传感器探头泄漏出来，形成消逝波。通过分析传输强度，可以提高 COS 的性能。结果表明，芯偏移结构在光纤传感器的发展中具有很大的潜力。
