Gas refractive index sensor with an integrated prism and a microlens array

Wei, An-Chi; Sze, Jyh-Rou; Du, Hsin-Ming

doi:10.1016/j.ijleo.2023.170747

Cited by 2 publications

(1 citation statement)

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“…In recent years, sensing technologies based on surface plasmon resonance (SPR) and Bloch surface waves (BSWs) have found wide applications in various sensing and detection fields, including chemistry, gas sensing, and biosensors. [1][2][3][4] These technologies are characterized by their ability to achieve label-free detection, rapid real-time responses, and higher sensitivity. [5][6][7][8] SPR is based on the principle of attenuated total reflection (ATR), 9 where surface waves (SWs) are excited under ATR conditions.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of Bloch surface wave sensor with high sensitivity and quality factor using LiNbO3

Wei,

Shi,

Liu

et al. 2024

J. Nanophoton.

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This work presents a refractive index sensor based on Bloch surface waves (BSW) with high sensitivity and quality factor (Q). The sensor utilizes a one-dimensional photonic crystal TiO 2 ∕MgF 2 as a distributed Bragg reflector and employs a LiNbO 3 thin film as the top defect layer to excite BSW through a Kretschmann prism. Numerical simulations using the rigorous coupled wave analysis method are conducted to explore various prism configurations, revealing that low refractive index prisms yield superior performance for BSW sensors. The designed sensor achieves a sensitivity of 1600 nm/RIU (or 938 °/RIU) and is analyzed for its full-width at halfmaximum and quality factor (Q), with the sensor's Q value reaching 8000 /RIU (or 13595 /RIU). Through manufacturing error analysis, it was found that the designed sensor has good mechanical robustness, is easy to manufacture, and is also easy to integrate. The results show that the LiNbO 3 nonlinear tunable material has great application prospects in the field of refractive index sensors.

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