A new approach to determining the sensitivity of refractive index sensors is proposed. It has been shown that relative and absolute show different results, also, for first time, it demonstrated advantages over sensitivity. In addition, influence width photonic band gap difference in indices layers on are examined corresponding dependences these parameters obtained. We propose as a convenient tool optimizing based defective crystals. Finally, results obtained regarding behavior defect mode at...

In the present paper we consider some properties of defect modes in chiral photonic crystals with an anisotropic layer. We solved problem by Ambartsumian's layer addition method. investigated influence thickness variation and its location crystal (CPC) also optical axes orientation, as well CPC on mode properties. Variations have impact linewidth light accumulation defect. obtain that CPCs lose their base property at certain thicknesses; namely, they diffraction reflection dependence...

Abstract In this paper, we investigated the possibility of using defect modes (DMs) in second photonic bandgap (PBG) defective one dimensional (1D) crystals (PCs) for creating optical sensors. The dependencies relative sensitivities on layer (DL) thickness first and PBGs at optimized PC parameters are obtained compared advantage PBG over all ranges DL is shown. However, as order mode (DM) contrast structure increase, becomes less prominent. behavior DMs their sensitivity outside when changes...

The possibility of determining the magnitude neutral atom density in hydrogen plasma was investigated using Paschen-Back effect and resonant Faraday rotation polarization plane light by residual atoms plasma. In strong magnetic fields when Zeeman shift is greater than distance hyperfine structure energy levels observed. this case, it no longer possible to speak about independence splitting each level a given multiplet term.

It is very important to design a rapid and sensitive device for the creatinine concentration detection due it being one of most considerable benchmarks efficient kidney working. Here, novel biophotonic sensor using one-dimensional ternary PC based on Si/TiN/SiO2 layers proposed in blood serum sample. A central cavity layer inserted between two equal periodic numbers. The sample can be infiltrated with various concentrations. Based technique transfer matrix, transmittance spectra properties...

We report the discovery of a new effect, namely, effect magnetically induced transparency. The is observed in active helically structured periodical medium. Changing external magnetic field and absorption, one can tune frequency linewidth transparency band.

We propose a new optical biosensor based on photonic crystal with defect layer, which can determine the SARS-CoV-2 concentration in water by mode shift. Two models of dependence refractive index layer pathogen were considered. The optimal parameters for our device and thickness determined. It was also demonstrated that presence absorption investigated structure it is much more advantageous to work reflection compared transmission mode. Finally, wavelength obtained sensitivity sensor

We propose an improved structure of optical biosensor based on a photonic crystal with defect layer, which can detect the concentration organic contaminants in water by mode shift. investigated 4 types defective crystals different arrangements layers inside perfect and their impact performance sensor. The sensitivity amplitude were examined as function layer thickness. Also, peculiarities edge modes presence investigated. Finally, we obtained characteristic equation to determine wavelengths...

In the present paper we consider reflection spectra peculiarities of a cholesteric liquid crystal (CLC) cell with two defect layers. We both isotropic and anisotropic cases. The problem is solved by Ambartsumian's modified layer addition Muller's matrix methods. investigated influence thicknesses location changes in CLC on modes photonic band gap. particular, considered (in detail) cases when layers are half-wave or quarter-wave plates. also dielectric borders spectra. showed that subject...

In the present paper we investigated optical properties of a stack right- and left- hand chiral photonic crystal layers. The problem is solved by Ambartsumian's layer addition modified method. We reflection spectra peculiarities this system showed that in contrast to single cholesteric liquid (CLC) has multiple band gaps (PBGs) (at light normal incidence). unique polarization properties, particularly eigenpolarizations (EPs) are degenerated (i.e., two EPs coincide) for an even number layers...

The photonic density of states (PDS) the eigen polarizations (EPs) in cholesteric liquid crystal (CLC) cells are calculated. dependences PDS on parameters characterizing absorption, gain and refractive index CLC layer surroundings were obtained. We investigated possibility connections between light energy accumulated medium showed that these characteristics have analogous spectra and, besides, influences problem also analogous. It was shown decrement leads to a sharp increase maximum...

Using the exact analytical expressions for reflection and transmission matrices finite thickness cholesteric liquid crystal (CLC) layer, we calculated its photonic density of states (PDS) eigen polarizations (EPs). We investigated influence absorption gain, as well CLC cell local dielectric anisotropy on PDS. presented full picture distribution total field in layer outside it two EPs. The possibility connections between PDS light energy accumulated medium was investigated, shown that these...

We investigated the specific properties of magnetically induced transparency (MIT) and absorption (MIA) in helically structured periodic crystals (HSPCs). showed that for wavelength MIT we have an ideal optical diode: The forward signal passes fully, while backward is completely absorbed not reflected. A formula λ_{t} MIA resonance based on numerical simulations was analytically obtained. influence HSPC parameters Δλ_{t}, line half width, by simulations. light energy density, ellipticity...

We investigated the properties of cholesteric liquid crystals (CLCs) being in an external static magnetic field directed along helix axis. considered a dichroic CLC, that is, CLC with parameters $\mathrm{Re}\mathrm{\ensuremath{\Delta}}=\frac{\mathrm{Re}{\ensuremath{\varepsilon}}_{1}\ensuremath{-}\mathrm{Re}{\ensuremath{\varepsilon}}_{2}}{2}=0$ and...

Light transmission through and reflection from a medium layer with dielectric magnetic helicities are discussed. The axes of the permittivity tensor, , permeability as well helix axis all parallel to each other they perpendicular boundary surfaces. possibilities formation some new types photonic bandgaps (PBGs) presented for large anisotropies medium—namely, direct indirect nonselective PBGs (with respect incident light polarization, in contrast usual PBGs, which selective polarization...

We consider generation of diffusive radiation by a charged particle passing through random stack plates in the infrared region. Diffusive originates due to multiple scattering pseudophotons on plates. To enhance intensity one needs make more effective. For this goal we suggest use materials with negative dielectric constant .

In our paper, the magneto-optical properties of a dichroic cholesteric liquid crystal layer with large values parameter g and low dielectric permittivity were investigated. The solutions dispersion equation their peculiarities investigated in detail. specific reflection, transmission, absorption, rotation, ellipticity spectra also azimuth eigen polarization existence tunable linear nonreciprocal transmission band was shown.