Abstract Detecting alterations in the electrical response of human biofluids can provide valuable information early stages on pathological conditions a patient. Developing techniques for obtaining rapid resistivity common ionic by non-invasive improve medicare through and more precise diagnosis. In this work, we analyze use an device consisting cell formed flat parallel steel plates to measure these substances. When is filled with biofluid double layer (EDL) electrodes/biofluid interface....

We investigate the use of Abbe-type refractometers with homogeneous absorbing fluids. derive a simple model based on electromagnetic optics to describe quantitatively angular distribution light around critical angle and report some experimental tests. First, we verify experimentally that diffusing film near base prism does in fact deliver refracts up angle. Then compare profiles refracted theoretical profiles, find very good agreement. Finally, analyze requirements limitations using

We describe a method for obtaining the refractive index (RI), size, and concentration of nonabsorbing nanoparticles in suspension from relatively simple optical measurements. The requires measuring complex effective RI two dilute suspensions particles liquids different indices. theoretical basis proposed provide experimental results validating procedure.

Identifying abnormalities in red blood cells can provide important medical clues for the diagnosis, prognosis, and treatment of some health disorders. A common test used to examine conditions erythrocytes humans is osmotic fragility. The standard technique determine fragility laborious time-consuming, provides only approximate values with a few experimental data. In this work, we propose investigate way measure erythrocytes, rapidly straightforward, more quantitative less way, an optical...

We investigate theoretically the coupling of exciton with light in a one-dimensional photonic crystal. The unit cell crystal consists two alternating layers, namely metallic layer and semiconductor one. frequency-dependent dielectric function metal is described by Drude model, whereas for we use nonlocal excitonic function. polariton dispersion s -polarized modes metal-semiconductor compared that dielectric-semiconductor Because low-frequency gap appears band structure. presence gives rise...

We assess the validity and possible use of a simple formula for complex effective refractive index colloidal suspension very small particles obtained from quasi-crystalline approximation. This approximation takes into account so-called dependent scattering effects, which are strongest, in relative terms, suspensions non-absorbing nanometer-sized particles. test experimentally predictions model extinction light dispersions sodium dodecyl sulfate micelles tri-distilled water. find that...

The THz and infrared photonic dispersion relations of superlattices composed polaritonic material bismuth (Bi) layers are theoretically investigated. semimetal Bi presents a far-infrared response described by Drude-like formula with large high-frequency background dielectric constant. We have considered three different materials: NaBr, LiCl LiH, such that the plasma frequency lies above, in-between below characteristic frequencies materials, respectively. Investigating band structure each...

We analyze a method recently proposed to retrieve the size, refractive index, and concentration of particles in nonabsorbing nanofluids from measurements complex effective index two dilutions nanofluid [Opt. Lett.39, 559 (2014)]. The uses simple formulas particles' parameters. First, we discuss precautions needed with new when inferring imaginary part original nanofluid. Then use this methodology obtain some average radius size polydisperse suspensions case weakly absorbing particles. also...

We derive an optical model for the light intensity distribution around critical angle in a standard Abbe refractometer when used on absorbing homogenous fluids. The is developed using rigorous electromagnetic optics. obtained formula very simple and can be suitably analysis design of sensors relying type refractometry.

Today, visual classification of the degree lipemia in blood samples is frequently performed clinical laboratories. However, achieving standardization this at low cost and with fewer resources an objective that still under development. In work, a comparison made between inspection optical measurements plasma for quantifying lipemia. The refractive index’s real part was measured using Abbe refractometer transmittance were 589 nm wavelength wavelengths ranging from 320 to 1100 spectral region,...

Determining a substance’s refractive index (RI) is of great importance in wide variety disciplines, such as chemistry, biomedicine, engineering, and optics, to name just few. This work utilizes critical-angle reflectometry measure the dentin, biological tissue characterized by its high RI complex structure. We fabricated hollow semicircular prism filled it with bromonaphthalene (1-B), allowing us RIs up 1.65. used 5 tooth samples exposed dentin laser diode beam (λ = 650 nm) incident on...

Background:The osmotic fragility (OF) test is one of the most suitable procedures to determine resistance erythrocyte membrane under conditions stress.One frequent clinical uses FO diagnosis hereditary that affect erythrocytes: thalassemia and spherocytosis.Both induce red blood cells (RBCs) be prone swelling then lyse stress faster than those RBCs without any pathology.Since standard OF time consuming needs specialized equipment, a fast, accessible, reliable technique necessary...

We explore using measurements of the effective refractive index a metallic nanofluid to estimate size particles in it. assume consists spherical nanoparticles suspended transparent base liquid and discuss way measuring real imaginary parts for concentrated nanofluids about 1% particles' volume concentration. Specifically, we consider case copper water. propose an unambiguous optical parameter as candidate evidence particle size, potentially time. Limitations due dependent scattering effects...

We present a brief overview of using the effective refractive index colloidal suspensions for characterizing nanoparticles. focus our analysis on so-called nanofluids consisting nanoparticles suspended in homogenous liquid matrix. Particular attention is paid to role real part sizing then discuss possible ways measure and precautions needed.

A recently devised method to measure the effective refractive index of highly turbid media, based on transmission backscattered light near critical angle, is used human blood. We present preliminary results showing feasibility such measurements and indicating that red cells in blood our experiments decrease below value blood's plasma.