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Special Issue on AsiaNANO2008; Edited by A. T. S. Wee, A. C. A. Wan, Y. P. Feng, H. Zhang, M. B. A. Jalil and S. ValiyaveettilNo Access


    Plasmonic crystal or gratings with periodicity and amplitudes suitable for plasmon coupling can be fabricated using interference lithography technique. The grating structure is holographically formed in a photoresist film. This technique offers an easy way to control the vertical and horizontal ratio of the corrugated profile. Since surface polaritons are extremely sensitive to the changes at the metallic and dielectric interface, one can expect that by controlling this refractive index, an effective control of the SPP can be realized. Different diffracted orders can be explored by controlling the dielectric medium, in this case hybrid materials. A comprehensive simulation that models the effect of dielectric medium to the changes of SPP coupling condition has been undertaken for the reflectivity and azimuthal angle dependence. An active porous thin film, which is hybrid organic–inorganic materials synthesized by sol–gel techniques, starting from bridged polysilsesquioxanes with phenol red, is coupled on plasmonic crystals in order to exploit enhanced effective refractive index sensitivity for sensing purposes; in this case, we use hydrochloric acid as analyte. The porosity of film increases reacting surface area and chemical reactivity of the plasmonic crystal. This film will change color from yellow to orange red when exposed to the acid. The change of optical characteristic after matrix wetting in HCl 0.01 molar solution has also been characterized. The activity of the film is determined by the dielectric properties depending on an applied external electric and magnetic field. They constitute molecular-engineered materials that exhibit a fine control in porosity in order to control the permittivity of the dielectric medium. The optical, thermal, and structural characterizations of these films are investigated by ellipsometry, DTA, and FTIR measurements. We present this configuration as a sensitive architecture for plasmonic-based sensor application.


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