DESIGN AND CHARACTERIZATION OF A SIMPLE TEMPERATURE SENSOR BASED ON A POLYMER SINE S-BEND OPTICAL WAVEGUIDE STRUCTURE
DOI:
10.29303/ipr.v8i3.511Downloads
Abstract
This study presents the design, fabrication, and performance evaluation of a sine S-bend embedded square-core optical waveguide for temperature sensing applications. The waveguide was fabricated using a straightforward and cost-effective CNC milling technique, with PMMA as the cladding and unsaturated polyester resin (UPR) as the core material. Three different bend heights (0.5 cm, 0.6 cm, and 0.7 cm) were investigated to assess their effects on sensor sensitivity, response time, accuracy, and hysteresis. Results showed that increasing the bend height enhanced the sensor sensitivity, with the highest sensitivity of 0.0283 dB/°C achieved at a bend height of 0.7 cm. The response time was consistently maintained at approximately 40 seconds across all samples. The sensor exhibited excellent accuracy, reaching up to 99.31% at a bend height of 0.5 cm. The maximum hysteresis observed was 0.202 % at a bend height of 0.7 cm, indicating stable performance during thermal cycling. These results confirm that the integration of a sine S-bend structure, smooth core surface, and precise waveguide dimensions can significantly improve sensor performance while maintaining a simple and scalable fabrication process.Keywords:
Temperature sensor, S-bend, Optical waveguide, PMMA, UPRReferences
[1] R. Soltani Sarvestani, R. Ghayour, and M. Mohitpour, "Design and analysis of an optical demultiplexer based on Bragg grating using plasmonic waveguides and defects," Optik, vol. 322, p. 172209, 2025.
[2] Z. Wang, J. Du, K. Xu, and Z. He, "Wideband non-degenerate two-photon absorption in low-loss multimode silicon waveguides for nonlinear optical tuning between C and 2-μm wavebands," Opt. Commun, vol. 578, p. 131506, 2025, doi: 10.1016/j.optcom.2025.131506.
[3] J. Zhang and Q. Chen, "A Ti: LiNbO3 optical waveguide sensor for measurement of intensive electric field," Opt. Laser Technol, vol. 169, p. 110091, 2024.
[4] P. K. Teotia and R. S. Kaler, "Multilayer with periodic grating-based high-performance SPR waveguide sensor," Opt. Commun, vol. 395, pp. 154–158, Jul. 2017.
[5] B. Hooda and V. Rastogi, "Low cost highly sensitive miniaturized refractive index sensor based on planar waveguide," Optik, vol. 143, pp. 158–166, Aug. 2017.
[6] G. Mamtmin, P. Nizamidin, R. Abula, and A. Yimit, "Composite optical waveguide sensor based on porphyrin@ZnO film for sulfide-gas detection," Chin. J. Anal. Chem, vol. 51, no. 7, p. 100260, 2023
[7] Y. Tan et al, "Slit shaping technique for femtosecond laser direct write fabrication of two-dimensional symmetric waveguide arrays in silica glass," Opt. Laser Technol, vol. 182, p. 112146, 2025.
[8] P. A. Mohammed, R. M. Abdulla, and S. B. Aziz, "Light-matter interaction during and post polymerization in self-written polymer waveguide integrated with optical fibers," Phys. B Condens. Matter, vol. 695, p. 416481, 2024.
[9] Z. Gao et al, "Silica–Polymer Heterogeneous Hybrid Integrated Mach–Zehnder Interferometer Optical Waveguide Temperature Sensor," Polymers, 2024.
[10] H. Deng et al, "A Temperature Sensor Based on Composite Optical Waveguide," J. Light. Technol, vol. 40, no. 8, pp. 2663–2669, 2022. [Online]. Available: https://opg.optica.org/jlt/abstract.cfm?URI=jlt-40-8-2663
[11] R. B. Davila et al, "Printed Optical Waveguide Temperature Sensor With Rhodamine-Doped Core," IEEE Sensors Lett, vol. 8, no. 8, pp. 1–4, 2024, doi: 10.1109/LSENS.2024.3420781.
[12] R. M. Silva et al, "A simple, self-referenced, intensity-based optical fibre sensor for temperature measurements," Opt. Commun, vol. 291, pp. 215–218, Mar. 2013.
[13] J. Li et al, "An optical fiber temperature sensor based on fluorescence intensity ratio in Er3+/Yb3+ co-doped Gd2O3 phosphors," Ceram. Int, vol. 49, no. 17, Part B, pp. 28913–28919, 2023.
[14] X. Wang, S. Chen, S. Xu, and L. Chen, "Dual-mode optical thermometers and optical fiber temperature sensor based on La2MoO6: Er3+, Yb3+ phosphors," J. Lumin, vol. 280, p. 121096, 2025.
[15] M.-H. Yu et al, "The development of a dual-mode optical temperature sensor based on fluorescence intensity ratio and lifetime," Ceram. Int, vol. 50, no. 7, Part B, pp. 11766–11775, 2024.
[16] X. Jiao, X. Gong, and Z. Guo, "X-LiNbO3/sapphire optical temperature sensor based on light field manipulation," Sensors Actuators A Phys, vol. 387, p. 116357, 2025.
[17] M. Remouche, R. Mokdad, A. Chakari, and P. Meyrueis, "Intrinsic integrated optical temperature sensor based on waveguide bend loss," Opt. Laser Technol, vol. 39, no. 7, pp. 1454–1460, 2007.
[18] M. Remouche, F. Georges, and P. Meyrueis, "Flexible Optical Waveguide Bent Loss Attenuation Effects Analysis and Modeling Application to an Intrinsic Optical Fiber Temperature Sensor," Opt. Photonics J, vol. 2, no. 1, pp. 1–7, 2012.
[19] C. Gu, B. Li, X. Zuo, and Y. Liang, "Dual-core fiber temperature sensor based on bending assist and spot pattern demodulation," Opt. Commun, vol. 572, p. 130961, 2024.
[20] Y. Su et al, "S-shaped tellurite optical fiber surface plasmon resonance sensor for temperature and refractive index measurement," Opt. Laser Technol, vol. 179, p. 111385, 2024.
[21] S. P. K. Anguluri et al, "The design, analysis, and simulation of an optimized all-optical AND gate using a Y-shaped plasmonic waveguide for high-speed computing devices," J. Comput. Electron, vol. 20, 2021.
[22] N. Zamhari and A. A. Ehsan, "Large cross-section rib silicon-on-insulator (SOI) S-bend waveguide," Optik, vol. 130, pp. 1414–1420, 2017.
[23] S. Serecunova et al., "Waveguide shape and waveguide core size optimization of Y-branch optical splitters up to 128 splitting ratio," Opt. Commun, vol. 501, p. 127362, 2021.
[24] H. Zhao et al, "WMS-based near-infrared on-chip acetylene sensor using polymeric SU8 Archimedean spiral waveguide with Euler S-bend," Spectrochim. Acta A Mol. Biomol. Spectrosc, vol. 302, p. 123020, 2023.
[25] D.-H. Kim et al, "Novel S-Bend Resonator Based on a Multi-Mode Waveguide with Mode Discrimination for a Refractive Index Sensor," Sensors, 2019.
[26] Y.-J. Kim et al, "Thermal Reflow Effect in Multi-Mode Waveguide of S-Bend Resonator With Mode Discrimination," IEEE Photonics J., vol. 14, no. 1, pp. 1–6, 2022.
[27] K. Srivastava and N. Bhatia, "Field propagation method in a square core optical waveguide for designing multimode interference devices," in Frontiers in Optics + Laser Science 2022 (FIO, LS), Rochester, NY, USA: Optica Publishing Group, 2022, p. JW5B.34. [Online]. Available: https://opg.optica.org/abstract.cfm?URI=LS-2022-JW5B.34
[28] Yulianti et al, "Performances characterization of unsaturated polyester resin/polymethylmethacrylate waveguide for refractive index measurement," Optik, vol. 242, p. 167305, 2021.
[29] Yulianti et al, "Thermal Durability Characterization of a Simple Polymethyl-methacrylate (PMMA)," J. Penelit. Fis. dan Apl, vol. 14, no. 2, pp. 113–124, 2024.
[30] Syahriar, "Improved S-bend optical waveguide loss formula verified by experiments," Sci. Rep, vol. 15, no. 1, p. 1338, 2025.
[31] W. Hardiantho, B. Arminah, and A. Arifin, "Detection of Mercury Ions in Water Using a Plastic Optical Fiber Sensor," Indones. Phys. Rev, vol. 4, no. 2, pp. 95–103, 2021.
[32] N. F. Mohd Ibrahim et al, "Surface roughness effect on optical loss in waveguide using isotropically induced crosslink network of siloxane–polyimide copolymer," J. Appl. Polym. Sci, vol. 137, no. 47, p. 49554, 2020.
[33] M. S. Ab-Rahman et al, "Optimum design of an optical waveguide: Determination of the branching angle of s-bend waveguides," Optik, vol. 200, p. 163249, 2020.
[34] V. Prajzler and J. Zázvorka, "Polymer large core optical splitter 1×2 Y for high-temperature operation," Opt. Quantum Electron, vol. 51, no. 7, p. 216, 2019.
[35] F. Brik, S. Harize, A. Fares, and K. Saouchi, "Offset effect on the S-Bend structure losses and optimization of its size for integrated optics," Int. J. Electr. Comput. Eng, vol. 10, no. 4, pp. 4162–4167, 2020.
[36] Luo et al, "Analytical Evaluation and Experiment of the Dynamic Characteristics of Double-Thimble-Type Fiber Bragg Grating Temperature Sensors," Micromachines, vol. 12, no. 1, 2021.
[37] N. Bing et al, "Unsaturated polyester resin supported form-stable phase change materials with enhanced thermal conductivity for solar energy storage and conversion," Renew. Energy, vol. 173, pp. 926–933, 2021.
[38] M. Rohde et al, "Intercomparison of thermal diffusivity measurements on CuCrZr and PMMA," High Temp. Press, vol. 42, 2014.
[39] J. Casanova-Chafer, "Advantages of Slow Sensing for Ambient Monitoring: A Practical Perspective," Sensors, vol. 23, 2023.
[40] M. S. Avila-Garcia et al., “High sensitivity strain sensors based on single-mode-fiber core-offset Mach-Zehnder interferometers,” Opt. Lasers Eng., vol. 107, pp. 202–206, 2018.
[41] J. Li et al, "High-accuracy distributed temperature measurement using difference sensitive-temperature compensation for Raman-based optical fiber sensing," Opt. Express, vol. 27, no. 25, pp. 36183–36196, 2019.
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