Photonic Sensors, Volume. 12, Issue 3, 220309(2022)

Refractive Index Sensing Simulations of CsPbBr3 Quantum Dots/Gold Bilayer Coated Triangular-Lattice Photonic Crystal Fibers

Ye TAO1, Han YE2, Yong DING1, Xiaomin REN2, and Xiaolong LIU1、*
Author Affiliations
  • 1School of New Energy, North China Electric Power University, Beijing 102206, China
  • 2State Key Laboratory of Information Photonics and Optical Communications, University of Posts and Telecommunications, Beijing 100876, China
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    With the incorporation of noble metal materials, photonic crystal fibers (PCFs) could be performed as an effective platform for refractive index sensing of the filling analytes. Furthermore, by coating functional dielectric layers upon the metal surfaces, the resonance energy transfer is modulated from the core mode of the PCFs towards the surface plasmon resonance mode of the metals, and the sensing performance could be boosted. Here, considering that the exciton-plasmon coupling is efficient between perovskite quantum dots (QDs) and gold, a kind of CsPbBr3 QDs/Au bilayer coated triangular-lattice PCFs has been simulated numerically as the refractive index sensors. With the optimization of the QDs and gold layer thicknesses, together with the variation of the central hole size of the PCFs, in the refractive index (RI) region of 1.26 to 1.34, a rather narrow full width at half maximum (FWHM) of the loss spectra was achieved as 13.74 nm when the central hole size was 1.28 μm and the highest figure of merit was 63.79 RIU (the central hole size was 1.53 μm). This work demonstrates that the analyte identification accuracy was enhanced by FWHM narrowing of the loss spectra; in addition, taking the abundance of the material choice of perovskite QDs into consideration, more analytes could be detected effectively. Moreover, by adopting asymmetric structures, the sensitivity of the PCFs based refractive index sensors could be further improved.


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    Ye TAO, Han YE, Yong DING, Xiaomin REN, Xiaolong LIU. Refractive Index Sensing Simulations of CsPbBr3 Quantum Dots/Gold Bilayer Coated Triangular-Lattice Photonic Crystal Fibers[J]. Photonic Sensors, 2022, 12(3): 220309

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    Paper Information

    Category: Regular

    Received: Apr. 8, 2021

    Accepted: Jul. 19, 2021

    Published Online: Jan. 23, 2023

    The Author Email: LIU Xiaolong (



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