Advances in miniature optical waveguide sensors

Klainer, Stanley M.; Coulter, Stephen L.; Pollina, Richard J.; Saini, Devinder

doi:10.1016/s0925-4005(97)80189-x

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…The metallic particulate composite materials are used in a wide range of technical devices as waveguide sensors and other optical components. [7][8][9] The aim of the present study is to investigate the optical absorption and alternating current (AC) electrical properties of conductive polymer composites consisting of polystyrene (PS) matrix filled with iron particles of the average size of 100 mm. The effects of the temperature, applied field frequency, and filler concentration on AC electrical properties of the prepared composite were studied.…”

Section: Introductionmentioning

confidence: 99%

Optoelectrical properties of polymer composite

Zihlif

Faduos

Ragosta

2012

Journal of Thermoplastic Composite Materials

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The physical properties of polystyrene composites containing different concentrations of iron (0, 5, 10, 20 and 30 wt.%) were studied as a function of ultraviolet (UV) wavelength, iron concentration, temperature, and applied field frequency. The absorption spectra were collected using the UV-spectrophotometry, and the electrical results were determined using the alternating current (AC) impedance method. Analysis of the optical absorption spectra results showed that the transition of energy electrons is direct in k-space and the optical energy gap decreases with iron content. The impedance was measured in the frequency range 50 kHz-1 MHz and temperature range 30-110 C. It was found that the dielectric constant and the dielectric loss of the composites increase with iron concentration and decrease with the applied frequency. The AC conductivity of the composites increases with frequency, temperature, and iron concentration. The low value of the activation energies indicates that the composite of 30 wt.% of iron nearly becomes a conductive material.

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Section: Introductionmentioning

confidence: 99%

Optoelectrical properties of polymer composite

Zihlif

Faduos

Ragosta

2012

Journal of Thermoplastic Composite Materials

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“…A sizable portion of composites applications relies on the tailored dielectric properties. Such materials could be applied as a package of optoelectronic devices, which require high light transmittance in the visible wavelength range to communicate between the inside and outside of the devices (5,6).…”

Section: Introductionmentioning

confidence: 99%

Effect of particles size on the optical constants of iron/polystyrene composites via UV-radiation

AL-Aqrabawi

Zihlif

Elimat

2012

Radiation Effects and Defects in Solids

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The present study deals with the optical characteristics of polystyrene (PS) composites containing iron particles of different sizes: 5, 40, 110, and 250 μm. The optical absorption spectra were collected in the wavelength range 300-800 nm using a UV-spectrophotometer. The optical results obtained were analyzed in terms of the absorption formula for non-crystalline materials. The optical energy gap and other basic optical constants such as refractive index, dielectric constants, and optical conductivity were investigated and showed a clear dependence on the iron particles size. It was found that the optical energy gap for the iron-filled composites is less than that for the neat PS, and it decreases as the iron particle size decreases. The refractive index of the prepared composites was determined from the collected transmittance and reflectance spectra. It was found that the calculated dielectric constant and refractive index of the composites increase when the iron particles size decreases. The optical dispersion behavior of the composites was described by the single-oscillator model. Enhancement in the optical conductivity was observed with decreasing the iron particles size.

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“…Some of the main applications are to quantify protein adsorption, affinity-based recognition of bacteria or living cells. A vast variety of sensor principles have been proposed, including mechanical, electromechanical and optical systems (Lukosz 1995;Bernini, Campopiano and Zeni 2002;Krioukov, Klunder, Driessen, Greve and Otto 2002;Weissman 1997;Klainer, Coulter, Pollina and Saini 1997;Qing and Yamaguchi 1999). Optical sensing is the noncommunication field where integrated optic technology is expected to play an increasing role mainly because of their miniature, high sensitivity, small size, immunity to electromagnetic interference, and low price.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Sensitivity of Self-focused Nonlinear Optical Evanescent Waveguide Sensors

Shabat

Khalil

Taya

et al. 2007

International Journal of Optomechatronics

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This article presents an extensive theoretical analysis of nonlinear sensors consisting of a thin dielectric film surrounded by a self-focusing nonlinear cladding and a linear substrate. The sensitivity in evanescent optical waveguide sensors is derived when the effective index is greater and smaller than the refractive index of the guiding layer. The behavior of the sensitivity with different parameters of the structure is presented. Closed form analytical expressions and normalized charts are given to provide the conditions for the maximum sensitivity of nonlinear sensors when the measurand is homogeneously distributed in the semi-infinite waveguide cover (homogeneous sensing). The results will be compared with those of the well known linear evanescent waveguide sensors.

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Advances in miniature optical waveguide sensors

Cited by 14 publications

References 3 publications

Optoelectrical properties of polymer composite

Optoelectrical properties of polymer composite

Effect of particles size on the optical constants of iron/polystyrene composites via UV-radiation

Analysis of the Sensitivity of Self-focused Nonlinear Optical Evanescent Waveguide Sensors

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