Fiber-Bragg-grating-assisted surface plasmon-polariton sensor

Abstract

A theoretical scheme for a new surface plasmon-polariton (SPP) fiber sensor with a fiber Bragg grating imprinted into the fiber core for SPP excitation is presented for the first time to our knowledge. In our scheme the energy in the fiber core mode can be transferred to a SPP with high efficiency by means of a properly designed short-period fiber Bragg grating (SPG). Developed for the cylindrical (fiber) geometry, our scheme without loss of generality can be applied to a planar geometry. Our simulations are based on the coupled-mode method and are performed at telecommunications wavelengths.

Miniature Engineered Tapered Fiber Tip Devices by Focused Ion Beam Micromachining

“…The sensitivity of a pure-silica TFT-MG with the diameter of several micrometers is about tens of nm/RIU. By inducing metal-cladding, more cladding modes are possible to be excited and higher sensitivity can be obtained, which is so called grating-assisted surface plasmon-polariton (SPP)-like grating sensor (Nemova & Kashyap, 2006). Figure 16 shows the SEM picture of a metal-dielectric-hybrid TFT-MG (MD-TFT-MG) by FIB milling.…”

Surface Plasmon Resonance‐Based Fiber and Planar Waveguide Sensors

“…In 2006, the authors of this paper suggested an improved sensor by the use the "pure" SPP as opposed to the hybrid mode [20]. Contrary to SPW, in this "pure" SPP, almost all the energy is concentrated at the metal-dielectric interfaces.…”

“…Thus, the transmitted signal suffers a change in the amplitude through interference of the guided and cladding modes. The overlap of the excited cladding mode with the SPP is small, as seen in Figure 11: the surface Plasmon hybrid-mode has a substantial amount of its energy associated with the guided mode and is therefore intrinsically less sensitive to the surrounding liquid than the "pure" SPP scheme proposed in [20][21][22][23][24]. The second LPG couples the cladding hybrid mode back into the core mode for direct detection.…”

Large dynamic range SPR measurements using a ZnSe prism

“…Prisms are used in commercial instruments to avoid air-dielectric challenges of getting light into the prism to launch at the SPR angle, θ SPR . Alternative methods include end coupling using various wave guiding configurations [5,6], grating based diffraction assisted angular coupling [7][8][9], optical waveguide coupling [10], multimode optical fiber waveguide coupling [6], single-mode optical fiber waveguide and grating coupling combinations [11][12][13], scattering [14], and many more.…”