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Free-standing multilayer porous silicon (PS) film containing half-wave microcavity is installed into a planar glass cell and infiltrated with a nematic liquid crystal (LC) mixture E7. Here we present the results of theoretical and experimental research of the LC orientational properties and spectral characteristics of the microcavity under variable temperature and electric field applied. The reversible...
A theoretical analysis of the optical absorption and quantum efficiency (QE) in a resonant cavity enhanced InGaAs/GaAs P-i-n photodetector (RCE PD) is presented. Using anomalous dispersion (AD) mirror flattopped QE spectrum is obtained. The influence of the thickness and position of AD layer on the optical absorption and QE is shown and design with a maximum QE of 92.5% and 6 nm spectral flattop is...
We present a theoretical analysis on the optical absorption and quantum efficiency (QE) of a resonant cavity enhanced InGaAs/GaAs P-i-n photodetector (RCE PD). The QE is calculated by using transfer matrix method that includes the structural parameters of the RCE PD and takes into account the standing wave effect and a energy conservation law is offered. Using anomalous dispersion (AD) mirror flattopped...
The thermal dependence of mirror reflective properties in oxide-confined vertical-cavity surface-emitting lasers is investigated. The temperature distribution over a cavity versus applied current is then calculated. The refractive indexes of the mirror layers are subsequently redefined using the temperature coefficients, and changes in radial reflectance spectra of the mirror are analysed. Results...
We present the simulation results for the local director distribution of a nematic liquid crystal (NLC) confined inside cylindrical macropores of porous silicon (PS). The Frank free energy approach is used to describe the equilibrium configuration of the NLC in porous media. The influence of the molecular anchoring strength and of an externally applied electric field is investigated. Bruggeman approximation...
We present the simulated distribution of the local director of nematic liquid crystal (NLC) which is confined inside cylindrical macropores of the porous silicon. The Frank free energy approach is used to describe the NLC in porous medium. The influence of molecular anchoring strength and external electric field applied is investigated. Bruggeman approximation is used while calculating effective refractive...
We present a theoretical analysis on the quantum efficiency of a resonant cavity InGaAs/GaAs p-i-n photodetector (PD) for the ultrashort optical connections. The numerical method of calculation of quantum efficiency combining a transfer matrix method and a energy conservation law is offered. Using anomalous dispersion (AD) mirror as the top mirror flat-topped QE spectrum has been obtained. Conditions...
Microcavity based on macroporous silicon infiltrated with liquid crystals is described theoretically using the proposed model. We use construction of electrical contacts, which allows apply electrical field perpendicularly to the pore axis. Various cases of the pore size and different pre-orientation of liquid crystal molecules are considered. Reflection spectra for two orthogonal polarizations of...
We found a new class of heterostructures which have no discontinuities for one of the band edges and, therefore, called continuous-band heterostructures (CBHs). The promising properties of CBHs are discussed by consideration of their optical and electrical characteristics. CBH-based DBRs provide extremely low series resistance in comparison with conventional DBRs even at low level of doping that can...
In this paper, the Bragg mirrors manufactured of the macroporous silicon infiltrated with liquid crystals are investigated. The reflectance spectrum of the structure is calculated using a transfer matrix method. The influence of the applied alternating field on reflectance spectrum of the structure is considered. The comparative analysis of the Bragg lattices reflectance spectra with different anisotropy...
The thermal dependence of mirror reflective properties in oxide-confined VCSEL is investigated. The temperature distribution over the cavity versus applied current is calculated. The refractive indexes of the mirror layers are redefined by using the temperature coefficients, and changes in radial reflectance spectra of the mirror are analyzed. Results show a shift of stopband DBR at different injection...
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