Rifat AA et al (2016) Copper-graphene-based photonic crystal fiber plasmonic biosensor. Naik GV, Kim J, Boltasseva A (2011) Oxides and nitrides as alternative plasmonic materials in the optical range. Naik GV, Shalaev VM, Boltasseva A (2013) Alternative plasmonic materials: beyond gold and silver. Khalek MA, Chakma S, Ahmed K, Paul BK, Vigneswaran D, Zakaria R (2018) Materials effect in sensing performance based on surface plasmon resonance using photonic crystal fiber. Liu C, Yang L, Lu X, Liu Q, Wang F, Lv J, Sun T, Mu H, Chu PK (2017) Mid-infrared surface plasmon resonance sensor based on photonic crystal fibers. Merlo JM et al (2016) Wireless communication system via nanoscale plasmonic antennas. Maier SA (2006) Plasmonic field enhancement and SERS in the effective mode volume picture. Stockman MI (2011) Nanoplasmonics: past, present, and glimpse into future. The proposed RI sensor is an attractive platform for detecting various high RI chemical and biochemical samples due to simple design, cost-effective plasmonic material, relatively large detection range, high sensitivity, and promising linear sensing performance. We also study the amplitude sensitivity of the proposed sensor which shows promising value of 206.25 RIU −-nm excitation. The proposed PCF-SPR sensor has a RI detection range of 1.44 to 1.52 and exhibits two linear sensing regions with an average spectral sensitivity of − 16,275 nm/RIU for analyte RI ranging from 1.44 to 1.48, and − 7571 nm/RIU for analyte RI between 1.485 and 1.52, respectively.
Using both spectral and amplitude sensitivity methods, the sensing performance of the proposed sensor for detecting high-index analytes is numerically investigated. The interaction and interplay between fiber fundamental mode and plasmonic mode which lead to the formation of resonance peaks depending on the analyte refractive index (RI) are explained in detail. In this paper, a plasmonic refractive index sensor using a D-shaped photonic crystal fiber coated by titanium nitride has been proposed.
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