Materials Literature
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We develop a theory of time-resolved pump–probe optical spectroscopy for modelling interband absorption by an anisotropic semiconductor nanodumbbell. By considering three transition schemes where the pump and probe pulses are nearly resonant to a dipole-allowed interband transition of different elements of the nanodum…
The impact response of rubber and foam aluminum cushion spacers is simulated by ABAQUS finite element analysis software. It indicates that shape designed structures of rubber and foam aluminum buffer effectively in impact conditions. The rubber structure induces different deformation modes of the cushion spacer during…
Our main goal is to describe the basic steps for the emission control of the electromagnetic field leaving a tailored slit on a gold film, combined with a plasmonic grating designed on the output face, in order to make the emitted beam acquire the desired irradiation diagram (ID). A suitable numerical tool developed f…
We present technique of obtaining complex hybrid structures combining the multi-walled carbon nanotubes or multi-layer graphene and luminescent hydrophobic semiconductor core/shell quantum dots CdSe/ZnS. As a result, a formation of quantum dot decorated carbon nanotubes and graphene films is evidenced by 2D microlumin…
We prepared thin film opal crystals and studied their angle-resolved transmission spectra in linear and circular polarized light as a function of the incidence angle and the azimuth rotation angle. We also explored the polarization conversion in linear and circular polarized light. Based on the spectra analysis we asc…
Efficient photovoltaic conversion of solar energy requires optimization of both light absorption and carrier collection. This manuscript reviews theoretical studies of thin-film silicon solar cells with various kinds of ordered and disordered photonic structures. Light trapping capabilities of these systems are analyz…
Photonic systems with the capability to respond to different stimuli are more and more desirable for achieving multifunctionality and higher levels of performance. They demand materials with responsivity that may eventually be used for integrating sensing and actuating functions, a feature highly pursued in technologi…
Photoluminescence as a function of time, wavelength and temperature is used to elucidate the relaxation of energy in PbSe as a function of the structural arrangement of the nanocrystals. The contribution of radiation emission, Förster exchange and nonradiative relaxation are accounted in processes from 77 to 300 K and…
A theoretical analysis of nanoscale metallic hole filled with a dielectric material is presented. The dispersion characteristics of the guided modes of a dielectric-filled metallic nanohole show interesting characteristics such as negative dispersion which is not normally observed in air-filled structures. Moreover, t…
We theoretically investigate general existence conditions for broadband bulk large-wavevector (high-k) propagating waves (such as volume plasmon polaritons in hyperbolic metamaterials) in arbitrary subwavelength periodic multilayers structures. Treating the elementary excitation in the unit cell of the structure as a…
The dynamic response of end-clamped sandwich beams is predicted by loading the beams at mid-span using metal foam projectiles. The sandwich beams comprise aluminum alloy face sheets and aluminum foam cores. The aluminum foam cores, having identical areal density, exist in homogeneous core, low-high gradient-density co…
We investigate the use of carbon nano-tubes performed by chemical vapor deposition for photonics applications producing samples of various geometries on the same wafer and performing experiments and numerical modeling. Publisher’s Note: This paper, originally published on 5/2/14, was replaced with a corrected/revised…
An appearance of the photoluminescence anisotropy induced by photochemical reaction under continuous irradiation with polarized light is demonstrated for an ensemble of CdSe/ZnS quantum rods chaotically embedded in the pores of filter paper. A specific relaxation of the photoinduced anisotropy is revealed in darkness…
Incorporating resonant optical properties of metal nanostructures into nanoscale applications such as ultrahigh density storage devices, nanoelectronics, and nanophotonics has gained considerable interest within the last years. Recent advances in hybrid and molecular plasmonics are presented. The approach relies on ne…
In order to produce the most effective Ag nanoarrays for plasmon enhanced fluorescence and Raman scattering made using ferroelectric substrates, the optimum conditions for the creation of arrays must be identified. We study here Ag nanopattern arrays formed using ferroelectric lithography based on periodically proton…
Numerical simulation of the response of concrete structures to impact loading is an important tool in both the design of hardened protective structures and in the planning for effective attacks against such structures. This paper presents the development of an accurate finite-element model using AUTODYN to study the r…
Telah dilakukan sintesis dan karakterisasi bahan magnet SrO.6Fe2O3. Bahan system SrO - Fe2O3 dibuat melalui proses solid-solid mixing dan di sintering pada suhu 1200 oC selama 2 jam. Hasil refinement dari pola difraksi sinar-x menunjukkan bahwa telah terbentuk single phase bahan magnet system SrO.6Fe2O1 dengan struktu…
Telah dilakukan analisa pergeseran magnetic domain wall pada lapisan tipis free layer CoFeB untuk sistem spin-valve Tunneling Magneto-Resistance (TMR). Analisa telah dilakukan dengan menggunakan software Object Oriented Micromagnetic Framework (OOMMF) berdasarkan persamaan Landau-Lifshitz Gilbert (LLG). Analisa perges…
A solid circular cylinder with flat bases is illuminated by the incident plane wave. The scattered field is evaluated for the backscattering direction in the far zone. Physical optics (PO) far fields backscattered by acoustically hard and soft objects differ from each other only in sign. Hence, it is sufficient to exh…
The infinite grid is the Cayley graph of $\mathbb{Z} \times \mathbb{Z}$ with the usual generators. In this paper, the Ihara zeta function for the infinite grid is computed using elliptic integrals and theta functions. The zeta function of the grid extends to an analytic, multivalued function which satisfies a function…