Design of Strain-Sensing Devices in Microscale by Using Surface Plasmon Polaritons |
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Authors: | Hiroyuki Okamoto Kosuke Kusaka |
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Institution: | 1. Department of Systems and Control Engineering, Anan National College of Technology, 265 Aoki Minobayashi, Anan, Tokushima, 774-0017, Japan
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Abstract: | We have presented a strain-sensing device in microscale by using surface plasmon polaritons and multimode interference effects. The device is numerically investigated by the finite-difference time-domain method. Optimum depths and length of the structure are designed for sensing a strain. The size of the designed structure is several micrometers and is about a thousandth compared with a fiber Bragg grating strain sensor. The sensitivity of the designed structure is 11.34 pm/μ?? that is about ten times larger than that of a fiber Bragg grating strain sensor. The temperature sensitivity of the designed structure is 34.43 pm/ °C. This temperature sensitivity is three times larger than that of a fiber Bragg grating strain sensor. Therefore, temperature compensation techniques are needed for the structure. The presented structure has a simple design such as a plasmonic waveguide with a trench structure. The simple structural design device has a capability of being used in micro- and nano-electromechanical systems. |
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