Highly sensitive octagonal photonic crystal fiber based sensor

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Design and optimization of photonic crystal fiber for liquid sensing applications (2016, methodology): “From the overall discussion, we have found that our designed structures show better performance in relative sensitivity with more design simplicity than the prior structures [24, 25] for liquid sensing.”
A Novel Approach for Spectroscopic Chemical Identification Using Photonic Crystal Fiber in the Terahertz Regime (2018, background): “Note that the sensors proposed in [29]–[36] used silica as the background material.”
Terahertz Sensing in a Hollow Core Photonic Crystal Fiber (2018, result): “Moreover, besides high birefringence the proposed PCF based terahertz sensor also demonstrate extremely low EML and negligible confinement loss than obtained by prior PCFs [11]–[14], [25], [44].”