Browsing Staff publications (SoE) by Author "Ashwell, Geoffrey J."

Browsing Staff publications (SoE) by Author "Ashwell, Geoffrey J."

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  • Flannery, D.; James, Stephen W.; Tatam, Ralph P.; Ashwell, Geoffrey J. (Osa Optical Society of America, 1999-12-20)
    Fiber-optic chemical sensing has been demonstrated with a side-polished single- mode optical fiber, evanescently coupled to chemically sensitive Langmuir- Blodgett (LB) overlay waveguides. The sensors exhibit a ...
  • Ishaq Imran, M; Quintela, Antonio; James, Stephen W.; Ashwell, Geoffrey J.; Tatam, Ralph P. (Elsevier Science B.V., Amsterdam., 2005-06-01)
    The response of a fibre optic long period grating (LPG) to the surrounding refractive index is shown to be modified by the deposition of a thin film of thickness of order 100 nm onto the cladding. The LPG becomes sensitive ...
  • Flannery, D.; James, Stephen W.; Tatam, Ralph P.; Ashwell, Geoffrey J. (Optical Society of America, 1997-04-15)
    Evanescent coupling between a side-polished single-mode optical fiber and a single-mode, pH-sensitive Langmuir-Blodgett overlay is used to demonstrate an intrinsic fiber-optic pH sensor. The sensor shows a wavelength ...
  • Johal, S. S.; James, Stephen W.; Tatam, Ralph P.; Ashwell, Geoffrey J. (Optical Society of America, 1999-09-30)
    Second-harmonic radiation has been obtained from Langmuir-Blodgett films of E-N- octadecyl-4-[2-(4-dibutylaminophenyl)ethenyl] quinolinium octadecylsulfate, deposited as a waveguide overlay upon optical fiber that is ...
  • Rees, N. D.; James, Stephen W.; Staines, Stephen E.; Tatam, Ralph P.; Ashwell, Geoffrey J. (Optical Society of America, 2001-12-01)
    The fabrication of an optical cavity at the distal end of an optical fiber has been achieved by Langmuir-Blodgett (LB) deposition of tricosanoic acid. This technique allows nanometer-scale control over the cavity length ...

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