Temperature sensor based on surface plasmon resonance within selectively coated photonic crystal fiber

Abstract

We demonstrate a temperature sensor based on surface plasmon resonances supported by photonic crystal fibers (PCFs). Within the PCF, to enhance the sensitivity of the sensor, the air holes of the second layer are filled with a large thermo-optic coefficient liquid and some of those air holes are selectively coated with metal. Temperature variations will induce changes of coupling efficiencies between the fundamental core mode and the plasmonic mode, thus leading to different loss spectra that will be recorded. In this paper, variations of the dielectric constants of all components, including the metal, the filled liquid, and the fused silica, are considered. We conduct numerical calculations to analyze the mode profile and evaluate the power loss, demonstrating a temperature sensitivity as high as 720 pm/°C.

Analysis of Graphene-Based Photonic Crystal Fiber Sensor Using Birefringence and Surface Plasmon Resonance

“…The asymmetrical structure caused by the two larger holes in the first layer leads to strong birefringence, which helps in coupling more light into a particular direction, resulting in x-polarized resonance peak more sensitive and much stronger than the y-polarized. The larger holes in the second layer are selectively coated with grapheneAg bimetallic layers as it demonstrates better signal to noise ratio (SNR) compared with the entirely coated structure [20,21]. Moreover, graphene-Ag bimetallic layer-coated sensor shows a sharper resonance peak compared to graphene-Au bimetallic layers [11,22] and is more sensitive compared to Au-Ag bimetallic layers [23].…”

Temperature Sensing Using Photonic Crystal Fiber Filled With Silver Nanowires and Liquid

“…1(b). The purpose of the design is to enhance the coupling between a core-guided mode and a plasmonic mode, and simultaneously to reduce the plasmonic to plasmonic mode coupling [19], [20].…”

“…In 2010, Yu et al reported a new type of total internal reflection (TIR) PCF temperature sensor filled with ethanol, which is based on the strength of the modulation [18]. In 2012, Peng et al had demonstrated a temperature sensor based on surface plasmon resonances supported by PCFs, and numerically calculated a temperature sensitivity of 720 pm= C [19], and in 2013 they had proposed a temperature sensor using the bandgap-like effect [20]. However, the PCF-based SPR temperature sensors are based on the numerical simulation, the related report of the experiment is rare.…”

Temperature Sensor Based on Photonic Crystal Fiber Filled With Liquid and Silver Nanowires

“…Hassani et al first designed a RI sensor and realize the detectable RI change of 10 À4 [17]. Peng et al proposed a temperature sensor based on SPR within selectively coated PCF, and the sensitivity 720 pm/°C is obtained [18]. Liu et al presented a same type sensor based on PCF coated with nanoscale gold film.…”