Abstract
This study discusses whether the prism used in a Kretschmann-based surface plasmon sensor can be fabricated from a thermotropic liquid crystal (TLC) material. The refractive index of the TLC prism can be thermally tuned to match the excitation requirements for the surface plasmon modes along the metal–TLC interface of the proposed sensing platform. The TLC material was chemically prepared in vitro and was thermally and optically characterized. The measurements reported a wide mesophase temperature range ΔT (~35 °C) and a relatively high clearing temperature TC (~84 °C) which constitutes a stable thermal control for the TLC optical parameters. The experimentally measured refractive indices of the TLC material reflect a linear change in line with the temperatures at several selected wavelengths in the visible region. A design of the surface plasmon sensor was proposed, which provided a linear response to the investigated analytes refractive index. This work highlights the importance of employing TLC material in designs compatible with detecting refractive index changes by thermal tuning and presents refractive index interrogation as an alternative method for exciting surface plasmon modes.
Highlights
Surface plasmon polariton (SPP) excitation via the evanescent coupling technique has attracted interest concerning the employment of several optical materials [1,2], developing the design structure [3,4], and enhancing the detection process [5]
This approach takes advantage of the DCC binding with water, and
This approach takes advantage of the DCC binding with water, and further, the formation further, the formation of an removable product, dicyclohexylurea
Summary
Basic Science Department, Faculty of Engineering, The British University in Egypt, Sherouk City 11837, Egypt. National Center for Radiation Research (NCRRT), Department of Radiation Engineering, Egyptian Atomic. Medical Device Innovation Center, National Cheng Kung University, Tainan 70105, Taiwan
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