Highly sensitive, localized surface plasmon resonance fiber device for environmental sensing, based upon a structured bi-metal array of nano-wires

Abstract

We demonstrate a bi-metal coated (platinum and gold or silver), localized surface plasmon resonance fiber sensor with an index sensitivity exceeding 11,900 nm/RIU, yielding an index resolution of 2×10⁻⁵ in the aqueous index regime. This is one of the highest index sensitivities achieved with an optical fiber sensor. The coatings consist of arrays of bi-metal nano-wires (typically 36 nm in radius and 20 μm in length), supported by a silicon dioxide thin film on a thin substrate of germanium, the nano-wires being perpendicular to the longitudinal axis of the D-shaped fiber.

Photonic gas sensors exploiting directly the optical properties of hybrid carbon nanotube localized surface plasmon structures

“…Note this class of devices can be tailored for refractive index spectral sensitivity in different refractive index regimes by altering the structure, such as using different thicknesses of gold or silver as the metal overlay or changing the thickness of the other sub layers in the multi-layered coating 14 , 22 , 31 or changing the UV processing conditions 22 .…”

Fused Microknot Optical Resonators in Folded Photonic Tapers for in-Liquid Durable Sensing

“…Miniaturized active devices operated in liquid media are an attractive venue for localized sensing, potentially offering precise, low-cost, rapid, and sensitive environmental detection. Various approaches include optical-fiber [ 1 , 2 , 3 , 4 , 5 ], micro-mechanical [ 6 , 7 , 8 ], and plasmonic-nanowire [ 9 ] based environmental sensing in aqueous media. In particular, micro-structured fiber-optic transmission devices used as optics sensors offer comparative advantages over the alternative approaches (see, e.g., a recent review and references therein [ 1 ]).…”

Highly sensitive biochemical sensor comprising rectangular nanometal arrays

“…Thus, LSPR sensors have been adopted in numerous fields including chemistry, biochemical sensing, label-free detection, and optoelectronics [22][23][24][25][26][27][28][29][30][31].…”