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A finite-element method based on the vector H-field formulation in conjunction with perturbation techniques is used to study metal-clad microwire waveguides for bio-sensing applications. Sensors are designed to detect DNA hybridization through the change of the effective index and attenuation constant of the waveguide structure. The key parameters, such as effective index, loss coefficient, and spot...
A relative humidity sensor based on Multi Walled Carbon Nanotubes (MWCNTs) doped with polymer Poly(methyl methacryate) was proposed in this paper. The fabrication technique applied in this paper is a simple direct drawing method that was able to produce a uniform waist microfiber with a minimum diameter of 5 μm with a length of 5 mm. This microfiber was tested on a different range of relative humidity...
A simple salinity sensor for various concentrations of sodium chloride (NaCl) in de-ionized water is proposed and demonstrated. The beam-through technique is used to obtain output voltages of various sodium chloride solution concentrations. The concentrations of the sodium chloride solutions are measured in volume %. For a concentration change of sodium chloride from 0 to 12 % in de-ionized water,...
Photonic device structures such as photonic crystals, photonic wires and optical metamaterials — all with submicron features can be described as ‘nanophotonic’. Many of these devices and structures can be used as sensors. The usual approach is to photonic sensing is to change the refractive index of a surrounding medium. Here we consider several nanophotonic sensing systems, including asymmetric split...
Full-vectorial modal field and Poynting vector profiles for silicon based nanowires are presented by using a numerically efficient and rigorous H-field finite element method. Results for novel vertical and horizontal slot waveguides are also presented showing TE and TM modes guidance through the low index dielectric regions.
We demonstrate very low and flat dispersion (±2ps/nm/km, slope<0.0028ps/nm2/km@ 1.8–2μm) in the Mid-Infrared band along with high non-linear coefficient (γ=1155W−1 km−1@ 1.93μm) achieved in a tellurite photonic crystal fiber for generating supercontinuum with a broad bandwidth.
We investigated the effect of cladding etching on an arc induced long period fiber grating (LPFG). We compared the characteristics of the arc induced LPFG for changes in temperature, ambient refractive index and stress, i.e. between the etched and non-etched LPFG. The LPFG was etched using HF solution for 30 minutes and a red shift in wavelength was observed. We also found that the sensitivity of...
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