scholarly journals NONLINEAR OPTICAL WAVEGUIDE STRUCTURE FOR SENSOR APPLICATION: TM CASE

2007 ◽  
Vol 21 (30) ◽  
pp. 5075-5089 ◽  
Author(s):  
HALA M. KHALIL ◽  
MOHAMMED M. SHABAT ◽  
SOFYAN A. TAYA ◽  
MAZEN M. ABADLA
Keyword(s):  
Refractive Index ◽  
Theoretical Analysis ◽  
Closed Form ◽  
Optical Waveguide ◽  
Effective Refractive Index ◽  
Nonlinear Optical ◽  
Waveguide Structure ◽  
Analytical Expressions ◽  
Evanescent Waveguide ◽  
Waveguide Sensor

In this work, we present an extensive theoretical analysis of nonlinear optical waveguide sensor. The waveguide under consideration consists of a thin dielectrica film surrounded by a self-focused nonlinear cladding and a linear substrate. The nonlinearity of the cladding is considered to be of Kerr-type. Both cases, when the effective refractive index is greater and when it is smaller than the index of the guiding layer, are discussed. The sensitivity of the effective refractive index to any change in the cladding index in evanescent optical waveguide sensor is derived for TM modes. Closed form analytical expressions and normalized charts are given to provide the conditions required for the sensor to exhibit its maximum sensitivity. The results are compared with those of the well-known linear evanescent waveguide sensors.

Characterization of GeSbSe based slot optical waveguides

2020 ◽  
Vol 16 ◽  
Author(s):  
Muddassir Iqbal ◽  
YouQiao Ma ◽  
Delin Zhao ◽  
Babak Parvaei
Keyword(s):  
Refractive Index ◽  
Optical Waveguide ◽  
Resonance Wavelength ◽  
Distinct Pattern ◽  
Waveguide Structure ◽  
Silicon On Insulator ◽  
Slot Waveguide ◽  
Absorption Resonance ◽  
Low Refractive Index ◽  
Waveguide Geometry

Background: Among various chalcogenides, GeSbSe shows a good transmittance in the visible, NIR and, midIR spectrum from 1-20 μm and also demonstrates excellent moldability. <P> Objective: In current work, we have characterized GeSbSe glass for use in sensor mechanism and for adaptive polarization control. <P> Methods: After analysing an earlier work regarding GeSbSe based Silicon on insulator optical waveguide, we have implemented GeSbSe in low refractive index slot region of SOI slot optical waveguide. Change in waveguide geometry can cause a shift in the dispersion profile, but a relatively distinct pattern has been observed. T-slot waveguide structure has also been analysed, where GeSbSe has been implemented in low refractive index slot regions with Graphene layer beneath the horizontal slot region for enhancement in tailoring ability of the birefringence parameters. <P> Results: Literature review led to the presence of absorption resonance wavelength in SOI slot optical waveguide with our proposed composition, which is attributed to the single average harmonic oscillator property of the chalcogenides. In T-slot waveguide structure, it was found that shift in Fermi energy and Mobility values can bring a change in birefringence, even with constant waveguide geometry and operating wavelength. <P> Conclusion: Absorption resonance wavelength in GeSbSe slot optical waveguide has been exploited for proposing the refractive index dispersion sensor. Our design approach regarding T-slot waveguide may lead to provision of automated polarization management sources for the light on chip circuits

Evaluation of losses and group effective refractive index of Er3+:Ti:LiNbO3 optical waveguides

Open Physics ◽  
2011 ◽  
Vol 9 (3) ◽  
Author(s):  
Georgiana Vasile ◽  
Niculae Puscas
Keyword(s):  
Refractive Index ◽  
Laser Radiation ◽  
Optical Waveguide ◽  
Effective Refractive Index ◽  
Optical Waveguides ◽  
Optical Methods ◽  
Waveguide Resonator ◽  
Fabry Perot ◽  
Interferometry Method ◽  
Insertion Losses

AbstractIn this paper, we report some experimental results concerning several types of loss measurements of Er3+:Ti:LiNbO3 optical waveguides by using optical methods. Using the Fabry-Pérot interferometry method, we evaluated the attenuation coefficient of an optical waveguide resonator for a laser radiation having λ = 1.55 µm. We also evaluated the insertion losses, polarization dependent losses, and coupling with external losses. Additionally, from the transmitted spectra of the symmetrical monomode Fabry-Pérot optical waveguide resonator, we were able to evaluate the value of the group effective refractive index.

Nickel Determination by Complexation Utilizing a Functionalized Optical Waveguide Sensor

2000 ◽  
Vol 658 ◽  
Author(s):  
Erin S. Carter ◽  
Klaus-H. Dahmen
Keyword(s):  
Refractive Index ◽  
Optical Waveguide ◽  
Light Propagation ◽  
Sol Gel ◽  
Specific Chemical ◽  
Optically Transparent ◽  
Nickel Determination ◽  
Waveguide Surface ◽  
Waveguide Sensor ◽  
Surface Changes

ABSTRACTThis research focuses on the design of chemically functionalized optical waveguide sensors. The waveguide is an optically transparent sol-gel coated onto a glass substrate chip. By having a higher refractive index than the substrate, the waveguide internally reflects a laser beam to photodetectors at both ends of the chip. The adsorption of any species onto the waveguide surface changes the light propagation, and therefore its effective refractive index, N. The change in N is dependent upon the amount of analyte present. By covalently bonding specific chemical receptors onto its surface, it can be designed to target a particular analyte. This research involves functionalizing the surface of the waveguide with ED3A in order to complex out of solution Ni2+. The change in N and the thickness of the adlayer will allow the concentration to be determined.

Effective Refractive Index and Lipid Content of Extracellular Vesicles Revealed Using Optical Waveguide Scattering and Fluorescence Microscopy

Langmuir ◽  
2018 ◽  
Vol 34 (29) ◽  
pp. 8522-8531 ◽  
Author(s):  
Déborah L. M. Rupert ◽  
Mokhtar Mapar ◽  
Ganesh Vilas Shelke ◽  
Karin Norling ◽  
Mathias Elmeskog ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fluorescence Microscopy ◽  
Optical Waveguide ◽  
Extracellular Vesicles ◽  
Lipid Content ◽  
Effective Refractive Index

Simulation of nonlinear optical waveguide structure by using FDTD technique

2003 ◽  
Author(s):  
Mohammed M. Shabat ◽  
Nafez M. Barakat ◽  
Samia Al-Azab ◽  
Dieter Jager
Keyword(s):  
Optical Waveguide ◽  
Nonlinear Optical ◽  
Waveguide Structure
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