Browsing by Subject "Refractive index"
Now showing items 21-28 of 28
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Article
Novel and Improved Methods of Writing Bragg Gratings with Phase Masks
(1995)The authors demonstrate the importance of spatial coherence of the writing beam for inscribing Bragg gratings with a phase mask. Bragg gratings were written using a normal excimer laser with the fiber placed at various ...
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Article
Optically thin palladium films on silicon-based substrates and nanostructure formation: effects of hydrogen
(2000)Optically thin palladium films evaporated on different silicon-based substrates are investigated following exposure to different concentrations of hydrogen gas in air. Laser modulated reflectance off the palladium surface ...
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Conference Object
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Conference Object
Selected antenna applications of Negative-Refractive-Index Transmission-Line (NRI-TL) metamaterials
(2006)Metamaterials (MM) that exhibit a simultaneously negative electric permittivity E and magnetic permeability μ, and thus a negative refractive index (NRI), have recently attracted considerable attention in the electromagnetics ...
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Article
Spectroscopic ellipsometry as a tool for the optical characterization and ageing studies of varnishes used in Post-Byzantine icon reconstructions
(2006)Abstract: The subject of picture varnishes has concentrated the attention of numerous researchers from various scientific fields, during the last 15 years. Although several analytical chemistry techniques have been used ...
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Conference Object
Study of optical fiber structures using atomic force microscopy and scanning near-field optical microscopy
(1996)Atomic force microscopy (AFM) and scanning near-field optical microscopy (SNOM) were used to study optical fiber structures. The refractive index profile of fiber was disclosed by surface topography of etched fiber endface ...
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Conference Object
Subwavelength imaging of an etched fiber with an intracore Bragg grating by apertured photon scanning tunneling microscope
(Society of Photo-Optical Instrumentation Engineers, 1995)Apertured photon scanning tunneling microscopy (APSTM) was used to image the internal structure of an etched optical fiber with an intracore Bragg grating. Direct evidence of the subwavelength periodic variation of the ...
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Conference Object
A zero beam-squinting leaky-wave antenna using NRI-TL metamaterials
(Institute of Electrical and Electronics Engineers Inc., 2015)A planar zero beam-squinting leaky-wave antenna is proposed at 5 GHz, consisting of a periodic arrangement of negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. The antenna is centre-fed through ...