Ultra-high sensitivity of dual dispersion turning point taper-based Mach-Zehnder interferometer

An Optical Sensor Designed From Cascaded Anti-Resonant Reflection Waveguide and Fiber Ring-Shaped Structure for Simultaneous Measurement of Refractive Index and Temperature

“…Because of the standard symmetrical structure of FRSS, some cladding mode light is recoupled to the SMF core after propagating through the bending region symmetrical to the excitation point, and the cladding mode interferes with the central core mode due to the different optical path and the different RI between the core and cladding to form MZI. As a typical MZI, the output intensity of interference fringes can be expressed as [2]: The free spectral range(FSR) of this MZI can be given by:…”

“…Accurate measurement of RI is needed in food, environment, and chemical industry. Up to now, many optical fiber RI sensors have been reported, including long-period fiber grating (LPFG) [1], Mach-Zehnder interferometers (MZI) [2], Michelson interferometers (MI) [3], Modal interferometer [4], Fabry-Perot interferometers (FPI) [5], and surface plasmon resonance [6,7]. Compared with these sensors, sensors made of curved single-mode fiber (SMF) [8,9], based on the interference between the core mode and the whispering gallery mode (WGM) [10], are easier to realize by mechanical bending SMF without any professional equipment and more sensitive to RI.…”

Ultrafast Response Optical Microfiber Interferometric VOC Sensor Based on Evanescent Field Interaction with ZIF‐8/Graphene Oxide Nanocoating

“…The device is fabricated as the procedure described previously. [26] Figure 1b shows the schematic of the device fabricated using the flame brush technique to taper a single-mode fiber. By using a microdisplacement platform controlled by computer, the fabricated microfiber can be designed and implemented with high reproducibility and precision.…”

Micro-/Nanofiber Optics: Merging Photonics and Material Science on Nanoscale for Advanced Sensing Technology

“…Zhang et al (Zhang et al, 2018) theoretically analyze the essential conditions to achieve the DTP, and experimentally demonstrated a gas refractometer with an exceptional sensitivity as high as À69,984.3 G 2,363.3 nm/RIU (Figures 5E and 5F). Based on numerical simulation, Sun et al found that two DTPs exist with a decrease in the microfiber waist diameter (Sun et al, 2019). For a 1.87-mm-diameter MNF, the RI sensitivity can be as high as 95,832 nm/RIU at the second DTP, which was among the highest sensitivity reported in fiber optical RI sensors.…”