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Appearance of photonic minibands in disordered photonic crystals (2003)
Journal Article
Kaliteevski, M., Manzanares Martinez, J., Cassagne, D., Albert, J., Brand, S., & Abram, R. (2003). Appearance of photonic minibands in disordered photonic crystals. Journal of Physics: Condensed Matter, 15(6), 785-790. https://doi.org/10.1088/0953-8984/15/6/305

We have demonstrated the appearance of photonic minibands within the photonic bandgaps of a disordered system represented by randomly distributed 'vacancies' of air cylinders. The positions of the photonic minibands are defined by the energies of the... Read More about Appearance of photonic minibands in disordered photonic crystals.

Increasing the efficiency of erbium-based sources using silicon quantum dots - Discussion (2003)
Journal Article
Abram, R., Kenyon, A., Stoneham, A., & Dobson, P. (2003). Increasing the efficiency of erbium-based sources using silicon quantum dots - Discussion. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 361(1803), 361-362. https://doi.org/10.1098/rsta.2002.1132

Silicon nanoclusters exhibit novel and interesting optical and electrical properties that are not observed in bulk silicon. Moreover, it has been discovered that there exists a strong coupling between nanoclusters and rare–earth ions that results in... Read More about Increasing the efficiency of erbium-based sources using silicon quantum dots - Discussion.

Finite and infinite elements for a simple problem in quantum mechanics (2002)
Journal Article
Bettess, P., & Abram, R. (2002). Finite and infinite elements for a simple problem in quantum mechanics. Communications in numerical methods in engineering, 18(5), 325-334. https://doi.org/10.1002/cnm.488

Finite element and infinite element models are used to predict the behaviour of a simple example problem in quantum mechanics, that of a linear harmonic oscillator. It is shown that good agreement with the analytical solution is obtained and that the... Read More about Finite and infinite elements for a simple problem in quantum mechanics.

Monte Carlo simulations of AlGaN/GaN heterojunction field-effect transistors (HFETs) (2002)
Journal Article
Herbert, D., Uren, M., Hughes, B., Hayes, D., Birbeck, J., Balmer, R., …Jones, S. (2002). Monte Carlo simulations of AlGaN/GaN heterojunction field-effect transistors (HFETs). Journal of Physics: Condensed Matter, 14(13), 3479-3497. https://doi.org/10.1088/0953-8984/14/13/307

Self-consistent Monte Carlo simulations are reported for AlGaN/GaN HFETs. Hot-carrier scattering rates are determined by fitting experimental ionization coefficients and the doping character of the GaN is obtained from substrate bias measurements. Pr... Read More about Monte Carlo simulations of AlGaN/GaN heterojunction field-effect transistors (HFETs).

Excitability of excitons and biexcitons in a ring cavity (2002)
Journal Article
Tronciu, V., & Abram, R. (2002). Excitability of excitons and biexcitons in a ring cavity. Physical review E: Statistical, nonlinear, and soft matter physics, 65(2), https://doi.org/10.1103/physreve.65.026616

We discuss the excitable behavior of excitons and biexcitons in a nonlinear optical ring cavity. The nonlinearity is due to the process of the creation of biexcitons by photon-assisted conversion of excitons. In the bifurcation analysis a region wher... Read More about Excitability of excitons and biexcitons in a ring cavity.

Diffraction and transmission of light in low-refractive index Penrose-tiled photonic quasicrystals (2001)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., Krauss, T., Millar, P., & DeLa Rue, R. (2001). Diffraction and transmission of light in low-refractive index Penrose-tiled photonic quasicrystals. Journal of Physics: Condensed Matter, 13(46), 10459-10470. https://doi.org/10.1088/0953-8984/13/46/314

We report the measurements of the diffraction pattern of a two-dimensional Penrose-tiled photonic quasicrystal, obtained by etching air cylinders in a silica substrate, and the modelling of the light propagation and dispersion relations of photons in... Read More about Diffraction and transmission of light in low-refractive index Penrose-tiled photonic quasicrystals.

Electromagnetic theory of the coupling of zero-dimensional exciton and photon states: A quantum dot in a spherical microcavity (2001)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., Nikolaev, V., Maximov, M., Sotomayor Torres, C., & Kavokin, A. (2001). Electromagnetic theory of the coupling of zero-dimensional exciton and photon states: A quantum dot in a spherical microcavity. Physical review B, 64(11), https://doi.org/10.1103/physrevb.64.115305

Exciton-light coupling in spherical microcavities containing quantum dots has been treated by means of classical electrodynamics within the nonlocal dielectric response model. Typical anticrossing behavior of zero-dimensional exciton-polariton modes... Read More about Electromagnetic theory of the coupling of zero-dimensional exciton and photon states: A quantum dot in a spherical microcavity.

Bandgap structure of optical Fibonacci lattices after light diffraction (2001)
Journal Article
Kaliteevski, M., Nikolaev, V., Abram, R., & Brand, S. (2001). Bandgap structure of optical Fibonacci lattices after light diffraction. Optics and Spectroscopy, 91(1), 109-118. https://doi.org/10.1134/1.1388332

The modification of the bandgap structure of optical Fibonacci lattices that arises from an increase in the system size is analyzed. It is found that there is a minimum critical size of the Fibonacci lattice necessary to form a photonic bandgap. The... Read More about Bandgap structure of optical Fibonacci lattices after light diffraction.

Optical eigenmodes of a multilayered spherical microcavity (2001)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., & Nikolaev, V. (2001). Optical eigenmodes of a multilayered spherical microcavity. Journal of Modern Optics, 48(9), 1503-1516. https://doi.org/10.1080/09500340108231779

The optical mode structure of a spherical microcavity has been investigated using a transfer matrix approach. We derive exact algebraic equations from which the frequencies of the optical eigenmodes of the two polarizations can be obtained, as well a... Read More about Optical eigenmodes of a multilayered spherical microcavity.

The transient signal response of submicron vertical silicon field-effect transistors (2001)
Journal Article
Crow, G., & Abram, R. (2001). The transient signal response of submicron vertical silicon field-effect transistors. Semiconductor Science and Technology, 16(4), 250-254. https://doi.org/10.1088/0268-1242/16/4/311

A Monte Carlo simulation has been used to model steady state and transient electron transport in a vertical geometry n-type silicon metal-oxide field effect transistor (Si n-MOSFET). Detailed time-dependent voltage signal analysis has been carried ou... Read More about The transient signal response of submicron vertical silicon field-effect transistors.

Optical eigenmodes of a spherical microcavity (2001)
Journal Article
Abram, R., Brand, S., Kaliteevski, M., & Nikolaev, V. (2001). Optical eigenmodes of a spherical microcavity. physica status solidi (a) – applications and materials science, 183(1), 183-187. https://doi.org/10.1002/1521-396x%28200101%29183%3A1%3C183%3A%3Aaid-pssa183%3E3.0.co%3B2-t

The optical mode structure of a spherical microcavity has been investigated using a transfer matrix approach. Exact algebraic equations from which the frequencies of the optical eigenmodes of the two polarizations can be obtained, as well as approxim... Read More about Optical eigenmodes of a spherical microcavity.

The design of two-dimensional photonic quasicrystals by means of a Fourier transform method (2001)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., Krauss, T., de La Rue, R., & Millar, P. (2001). The design of two-dimensional photonic quasicrystals by means of a Fourier transform method. Journal of Modern Optics, 48(1), 9-14. https://doi.org/10.1080/09500340108235149

We report a method of designing aperiodic photonic quasicrystals. The method is based on the recognition that the Fourier transform of the dielectric structure has a direct influence on the mode spectrum, and can be chosen to enhance the properties o... Read More about The design of two-dimensional photonic quasicrystals by means of a Fourier transform method.

Two-dimensional Penrose-tiled photonic quasicrystals: from diffraction pattern to band structure (2000)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., Krauss, T., DeLa Rue, R., & Millar, P. (2000). Two-dimensional Penrose-tiled photonic quasicrystals: from diffraction pattern to band structure. Nanotechnology, 11(4), 274-280. https://doi.org/10.1088/0957-4484/11/4/316

We report measurements of the diffraction pattern of a two-dimensional photonic quasicrystal structure and use the set of plane waves defined by the diffraction pattern as the basis of a theoretical approach to calculate the photonic band structure o... Read More about Two-dimensional Penrose-tiled photonic quasicrystals: from diffraction pattern to band structure.

Two-dimensional Penrose-tiled photonic quasicrystals: diffraction of light and fractal density of modes (2000)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., Krauss, T., de La Rue, R., & Millar, P. (2000). Two-dimensional Penrose-tiled photonic quasicrystals: diffraction of light and fractal density of modes. Journal of Modern Optics, 47(11), 1771-1778. https://doi.org/10.1080/09500340008232430

We report measurements of the diffraction pattern of a two-dimensional photonic quasicrystal structure. Using a set of plane waves defined by the diffraction pattern we introduce a theoretical approach for the calculation of the band structure which... Read More about Two-dimensional Penrose-tiled photonic quasicrystals: diffraction of light and fractal density of modes.

Monte Carlo simulations of SiGe n-MODFETs with high tensile-strained Si channels (2000)
Journal Article
Crow, G., Abram, R., & Yangthaisong, A. (2000). Monte Carlo simulations of SiGe n-MODFETs with high tensile-strained Si channels. Semiconductor Science and Technology, 15(7), 770-775. https://doi.org/10.1088/0268-1242/15/7/319

A Monte Carlo simulation has been devised and used to model steady state and transient electron transport in enhancement (recessed gate) and depletion (surface gate) mode SiGe n-MODFETs that have recently been the subject of experimental study. The s... Read More about Monte Carlo simulations of SiGe n-MODFETs with high tensile-strained Si channels.

Direct calculation of k.p parameters for wurtzite AlN, GaN and InN (2000)
Journal Article
Dugdale, D., Brand, S., & Abram, R. (2000). Direct calculation of k.p parameters for wurtzite AlN, GaN and InN. Physical review B, 61(19), 12933-12938. https://doi.org/10.1103/physrevb.61.12933

Electronic band structure calculations have been performed for the wurtzite structures of AlN, GaN, and InN. In particular, the conventional k⋅p valence band parameters Ai (i=1–7) have been computed from initial empirical pseudopotential calculations... Read More about Direct calculation of k.p parameters for wurtzite AlN, GaN and InN.

Calculation of the mode structure of multilayer optical fibers based on transfer matrices for cylindrical waves (2000)
Journal Article
Kaliteevski, M., Nikolaev, V., & Abram, R. (2000). Calculation of the mode structure of multilayer optical fibers based on transfer matrices for cylindrical waves. Optics and Spectroscopy, 88(5), 792-795. https://doi.org/10.1134/1.626880

Based on the method of transfer matrices for cylindrical waves, an analytical technique for calculating the dispersion dependences and the profiles of electromagnetic waves in multilayer and graded index optical fibers is developed.

Exciton polaritons in a cylindrical microcavity with an embedded quantum wire (2000)
Journal Article
Kaliteevski, M., Brand, S., Abram, R., Nikolaev, V., Maximov, M., Ledentsov, N., …Kavokin, A. (2000). Exciton polaritons in a cylindrical microcavity with an embedded quantum wire. Physical review B, 61(20), 13791-13797. https://doi.org/10.1103/physrevb.61.13791

Exciton-light coupling in cylindrical microcavities containing quantum wires has been treated by means of classical electrodynamics within the nonlocal dielectric response model. A typical anticrossing behavior of quasi-one-dimensional exciton-polari... Read More about Exciton polaritons in a cylindrical microcavity with an embedded quantum wire.

Optical properties of asymmetric InGaAs/InP coupled quantum wells (2000)
Journal Article
Ryan, D., Abram, R., & Robbins, D. (2000). Optical properties of asymmetric InGaAs/InP coupled quantum wells. IEE proceedings. Optoelectronics, 147(2), 83-88. https://doi.org/10.1049/ip-opt%3A20000288

Asymmetric double quantum well structures with applied transverse electric field are of interest in optical modulator applications. A theoretical model of their optical properties is described. The bandstructure of the heterostructure is calculated u... Read More about Optical properties of asymmetric InGaAs/InP coupled quantum wells.