Plasmon-based optical sensors for high-sensitivity surface deformation detection of silver and gold
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ORIGINAL ARTICLE
Plasmon‑based optical sensors for high‑sensitivity surface deformation detection of silver and gold Haoyue Hao1 · Fei Xing1 · Liang Li1 Received: 20 May 2020 / Accepted: 22 June 2020 © King Abdulaziz City for Science and Technology 2020
Abstract Surface deformation is a common phenomenon in many situations, and can be caused by stress, temperature variation, environmental variation, etc. With the developing of nanotechnology, biological and chemical properties of nano materials are generally in association with its surface condition. High-sensitivity methods of sensing super tiny surface deformations become necessary. In this work, a high sensitive surface deformation sensor is proposed by one-dimensional photonic crystal. Results show that Tamm plasmon polaritons are generated in this configuration and the reflection spectrum is dramatically influenced by the surface deformation of the silver and gold films. The variation rate of reflection light intensity reaches 20% when the surface deformation of is 1 nm. And the variation rate reaches 13% per nanometer for gold surfaces. Since the detecting precision of light intensity is greatly high, the theoretical precision of this device can reach picometer magnitude. Meanwhile, this configuration also can realize mapping surface deformation distribution through scanning method. The simulation results reveal the proposed configuration can distinguish 1 nm surface deformation of silver surfaces. Keywords Optical sensor · Surface deformation detection · Tamm plasmon polaritons · Photonic crystal · Nano optics
Introduction Sensitive sensing of surface deformation and tension is becoming increasingly important in material, chemical and biological fields, especially for two-dimensional materials (Xia et al. 2014; Yuan et al. 2016; Style et al. 2017; Liu et al. 2019). Optical sensors have played a important role in high-sensitivity sensing of various targets due to the development of laser and photonic technologies (Vilela et al. 2017; Kim et al. 2018). To increase the sensitivity, photonic localization phenomenon, generated by Tamm plasmon polaritons (TPPs), is used in this paper. Tamm plasmon polaritons is a relatively new phenomenon of localized field enhancement, which can be excited with both transverse electric and transverse magnetic polarized lights (Malkova et al. 2006; Sasin et al. 2008). In contrast to surface plasmon polaritons (SPPs) and Block surface wave (BSW), TPPs is excited at the boundary between the metal and * Liang Li [email protected] Haoyue Hao [email protected] 1
School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China
photonic crystal (PC) without the assistance of external structures, such as prisms or gratings (Kaliteevski et al. 2007; Wang et al. 2017; Bashiri et al. 2019; Goyal et al. 2020). Traditional Tamm structure, consists of metal film and PC, has a narrowband absorption in the stop-band of the PC. This property has great potential in many applications, such as tunab
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