Article

Surface Plasmon Resonance-like integrated sensor at terahertz frequencies for gaseous analytes

Engineering Physics Department, Ecole Polytechnique de Montréal, C.P. 6079, succ. Centre-Ville Montreal, Québec H3C3A7, Canada.
Optics Express (Impact Factor: 3.49). 01/2009; 16(25):20206-14. DOI: 10.1364/OE.16.020206
Source: PubMed

ABSTRACT

Plasmon-like excitation at the interface between fully polymeric fiber sensor and gaseous analyte is demonstrated theoretically in terahertz regime. Such plasmonic excitation occurs on top of a approximately 30 microm ferroelectric PVDF layer wrapped around a subwavelength porous polymer fiber. In a view of designing a fiber-based sensor of analyte refractive index, phase matching of a plasmon-like mode with the fundamental core guided mode of a low loss porous fiber is then demonstrated for the challenging case of a gaseous analyte. We then demonstrate the possibility of designing high sensitivity sensors with amplitude resolution of 3.4 x 10(-4) RIU, and spectral resolution of 1.3 x 10(-4) RIU in THz regime. Finally, novel sensing methodology based on detection of changes in the core mode dispersion is proposed.

Download full-text

Full-text

Available from: Alireza Hassani
  • Source
    • "Ref. [7] that SP has been used to assist a Cu x O photocatalyst to split pure water for H 2 gas production more rapidly. In the meantime, it has also been used to detect the presence of H 2 itself by replacing a cladding segment of an optical fiber with metallic layer as reported in Ref. [8] or using photonic crystal fiber [9]. A photonic structure, namely, a dielectric slab waveguide structure with embedded metallic grating has also been considered to be used for such purposes [10] [11] [12] [13]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We discuss the transmission characteristics of a microscale dielectric waveguide device with a deep groove and an embedded metallodielectric grating illuminated by a continuous wave of TM and TE modes at low terahertz frequency. To study its performance we solve numerically the corresponding Maxwell equations by means of finite difference time domain method with uniaxial perfectly match layer as its boundary condition. By varying the angle of incident, grating filling factor and refractive index of analyte in the deep groove, it is found that the device exhibits a significant transmission enhancement for the TM mode due to the existence of surface plasmon interaction. We also demonstrate its potential application as a biosensor device.
    Full-text · Article · Jul 2014 · Optik - International Journal for Light and Electron Optics
  • Source
    • "Recently PCF designs supporting a surface plasmon mode (SPM) using the metal-coatings in the cladding region have been reported, designed for their applications in the optical frequencies [5]–[8]. In this study, metal is introduced in the central air-hole of a defect-core PCF in order to influence the modal properties significantly in the THz domain, studying their guidance properties for a range of potential applications, including evanescent sensing [9]. The structure suggested here is feasible for fabrication with available technologies: involving the deposition of metal-coatings on the microstructured fibers [10], fabrication technology using Teflon to create the PCF [3], techniques for copper coating on Teflon using Chemical Vapor Deposition [11] and metal-coated hollow waveguide technology [12]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Modal solutions for metal-coated defect-core photonic crystal fiber (PCF) with a central air-hole have been obtained by using a full-vectorial finite element method to model the guidance of THz waves. It has been shown that the surface plasmon modes can couple with the defect-core PCF mode to form supermodes, with potential for sensing applications.
    Full-text · Article · Jun 2009 · Journal of Lightwave Technology
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: a b s t r a c t We present an experimental demonstration of surface plasmon enhanced terahertz spectroscopic iden-tification of methyl alcohol isotopes by use of metallic array of subwavelength holes. Due to isotopic hydrogen/deuterium substitution, the refractive indices of methyl alcohol and isotopes vary from each other in the terahertz regime. This leads to a modification in the wave vector and consequently the res-onance condition of surface plasmons excited at the metal–dielectric interface. A distinct resonance shift and an amplitude modification are observed, giving high characterization sensitivity and thereby demon-strating that such plasmonic array has potential in developing new techniques in isotope distinguishing.
    Full-text · Article · Apr 2009 · Chemical Physics Letters
Show more