We report exact solutions of the equations self-induced transparency which generalize linear theory refractive index up to theoretical peak intensities ${10}^{15}$ W ${\mathrm{cm}}^{\ensuremath{-}2}$. The indices are real, and there is no dissipation from inhomogeneous broadening. solve dielectric-surface problem for these solutions. note possibility regaining previous analytical in a fashion permits slight extension some critical examination these.

Abstract The building sector accounts for 36% of energy consumption and 39% energy-related greenhouse-gas emissions. Integrating bifacial photovoltaic solar cells in buildings could significantly reduce related greenhouse gas Bifacial should be flexible, bifacially balanced electricity production, perform reasonably well under weak-light conditions. Using rigorous optoelectronic simulation software the differential evolution algorithm, we optimized symmetric/asymmetric CIGS with either (i)...

The power conversion efficiency of an ultrathin CuIn1-ξGaξSe2 (CIGS) solar cell was maximized using a coupled optoelectronic model to determine the optimal bandgap grading nonhomogeneous CIGS layer in thickness direction. either sinusoidally or linearly graded, and modeled have metallic backreflector corrugated periodically along fixed direction plane. predicts that specially tailored can significantly improve efficiency, with much smaller improvements due periodic corrugations. An 27.7%...

Power-conversion efficiency is a critical factor for the wider adoption of solar-cell modules. Thin-film solar cells are cheap and easy to manufacture, but their efficiencies low compared crystalline-silicon need be improved. A thin-film cell with two absorber layers (instead only one), bandgap energy graded in both, can capture photons spectral range. With 300-nm-thick CIGS~absorber layer an 870-nm-thick CZTSSe~absorber layer, $34.45\%$ predicted by detailed optoelectronic model, provided...

The method recently developed for treating Bloch-Siegert shift of the main resonance in a magnetic experiment is successfully applied to higher order resonances due multiquantum transitions. A general analytical expression (2n+1)th given. Results and third low or vanishingly range static fields are also reported.

The transient response of an elastic cylinder to a laser impact is studied. When the source line perpendicular axis, modes guided along are generated. For millimetric steel up ten narrow resonances can be locally detected by interferometer below 8 MHz. These correspond Zero-Group Velocity or circumferential modes. authors observe that theory describing propagation waves in isotropic not sufficient precisely predict resonance spectrum. In fact, texture such elongated structure manifests as...

The rigorous coupled wave approach (RCWA) was implemented to investigate optical absorption in a triple-p-i-n-junction amorphous-silicon solar cell with 2D metallic periodically corrugated backreflector (PCBR). Both total and useful absorptances were computed against the free-space wavelength $\lambda_o$ for both s- p-polarized polarization states. absorptance each of three p-i-n junctions also normal as well oblique incidence. Furthermore, two canonical boundary-value problems solved...

Detailed optoelectronic simulations of thin-film photovoltaic solar cells (PVSCs) with a homogeneous photon-absorber layer made CIGS or CZTSSe were carried out to determine the effects defect density, minority carrier lifetime, doping composition (i.e., bandgap energy), and absorber-layer thickness on solar-cell performance. The transfer-matrix method was used calculate electron-hole-pair (EHP) generation rate, one-dimensional drift-diffusion model EHP recombination open-circuit voltage,...

Propagation of flexural guided waves in a fluid-loaded transversely isotropic cylinder is studied. Numerical results are presented for cobalt immersed water. The phase velocities not significantly affected except several modes which the energy leakage occurs into fluid over certain frequency ranges. Attenuation spectra leaking plotted.

The rigorous coupled-wave approach (RCWA) and the differential evolution algorithm (DEA) were coupled in a practicable to maximize absorption optical structures with three-dimensional morphology. As model problem, optimal values of four geometric parameters bandgaps three i-layers found for an amorphous-silicon, multiterminal, thin-film tandem solar cell comprising p – i n junctions metallic hexagonally corrugated backreflector. When short-circuit current density was chosen as figure merit...

An optoelectronic optimization was carried out for an AlGaAs solar cell containing (i) n-AlGaAs absorber layer with a graded bandgap and (ii) periodically corrugated Ag backreflector combined localized ohmic Pd-Ge-Au backcontacts. The of the varied either sinusoidally or linearly. efficiency 33.1% 2000-nm-thick is predicted linearly along silver backcontacts, in comparison to 27.4% obtained homogeneous continuous backcontact. Sinusoidal grading {is enhance} maximum 34.5%. Thus, layer,...

The field generalizes in a natural way the c-number theory of radiation reaction and frequency shifts due to Lorentz. By trivial extension operator can be applied more complicated cases single multi-level atom super-radiant problem N atoms on same site where these are coupled either vacuum or additional imposed quantized fields. further it also applies case different sites. Explicit expressions for positive negative parts total given terms arbitrary dipole sources apparently valid times t>>...

A new method is developed to calculate the Bloch-Siegert shift. Analytical expressions valid for entire range of shift are presented.

In this paper the spectrum of Lamb modes in an orthotropic plate is studied. Infinitely many are found which undergo a change sign their slopes twice, thus leading to two zero-group velocity points. A few possessing three such points also exist.

In Parts I [Appl. Opt.58, 6067 (2019)APOPAI0003-693510.1364/AO.58.006067] and II Opt.61, 10049 (2022)APOPAI0003-693510.1364/AO.474920], we used a coupled optoelectronic model to optimize thin-film CIGS solar cell with graded-bandgap photon-absorbing layer, periodically corrugated backreflector, multilayered antireflection coatings. Bandgap grading of the layer was continuous either linear or nonlinear, in thickness direction. Periodic corrugation coatings were found engender slight...

Characteristics of re∞ected power from a planar interface chiral and/or nihility media have been investigated theoretically. Focus the study is tunneling and rejection associated with these interfaces. Efiect polarization incidence fleld parametric dependence on noted. It found numerical results that strong dependency fleld, angle incidence, chirality parameter.

A coupled optoelectronic model was implemented along with the differential evolution algorithm to assess efficacy of grading bandgap CZTSSe layer for enhancing power conversion efficiency thin-film solar cells. Both linearly and sinusoidally graded bandgaps were examined, molybdenum backreflector in cell being either planar or periodically corrugated. Whereas an optimally can dramatically enhance efficiency, effect corrugating is modest at best. An 21.74% predicted sinusoidal a 870-nm-thick...

We study invariants of the anisotropic elasticity tensor. The are obtained by defining certain tensors order two associated with find four second‐order respect to arbitrary orthogonal transformations. This increases number already known such invariants. When transformation is confined rotations about x3‐axis, becomes seventeen, again an increase in number. describe a method for ascertaining linear independence these also recover structural Ting and few new

General methods are applied to find complete sets of invariants a tensor rank 3. When the results specialized piezoelectric tensor, it is found that has no linear invariant. Also under SO (2), as well (3), five quadratic invariants. The complete.

Comments are presented on two recent papers [J. Acoust. Soc. Am. 96, 2546 (1994), J. 100, 57 (1996)]. Their results can be obtained with much economy of work by employing an alternative representation for the decomposition displacement. This is useful whenever transversely isotropic materials being studied.