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Enhanced THz transmission apertures through sub-wavelength annular apertures (2006)
Journal Article
Gallant, A., Levitt, J., Kaliteevski, M., Wood, D., Petty, M., Abram, R., …Chamberlain, J. (2006). Enhanced THz transmission apertures through sub-wavelength annular apertures. Proceedings of SPIE, 6323, https://doi.org/10.1117/12.680552

We report on the development of a surface micromachined process for the fabrication of coaxial apertures surrounded by periodic grooves. The process uses a combination of copper electroforming and the negative epoxy based resist, SU8, as a thin flexi... Read More about Enhanced THz transmission apertures through sub-wavelength annular apertures.

THz frequency studies of metallic structures (2006)
Journal Article
Brand, S., Kaliteevski, M., & Abram, R. (2006). THz frequency studies of metallic structures. Proceedings of SPIE, 6328, 63280-63280. https://doi.org/10.1117/12.680313

A plane-wave complex photonic bandstructure approach is used to calculate the pass bands as a function of rod diameter for a system consisting of circular metallic rods in a 2-D square lattice. In addition, FDTD calculations are employed to calculate... Read More about THz frequency studies of metallic structures.

Eigenstate statistics and optical properties of one-dimensional disordered photonic crystals (2005)
Journal Article
Kaliteevski, M., Nikolaev, V., & Abram, R. (2005). Eigenstate statistics and optical properties of one-dimensional disordered photonic crystals. Physics of the Solid State, 47(10), 1948-1957. https://doi.org/10.1134/1.2087751

Optical eigenstates in one-dimensional disordered photonic crystals were studied. The threshold disorder level was established below which the probability of appearance of an eigenstate at the photonic bandgap center is negligible. The threshold is r... Read More about Eigenstate statistics and optical properties of one-dimensional disordered photonic crystals.

Self-consistent 2-D Monte Carlo simulations of InSb APD (2005)
Journal Article
Herbert, D., Childs, P., Abram, R., Crow, G., & Walmsley, M. (2005). Self-consistent 2-D Monte Carlo simulations of InSb APD. IEEE Transactions on Electron Devices, 52(10), 2175-2181. https://doi.org/10.1109/ted.2005.856802

Self-consistent Monte Carlo simulations are used to study the low noise and high gain potential of InSb avalanche photodiodes. It is found that for an electron-initiated avalanche, excess noise factors well below the minimum McIntyre value persist up... Read More about Self-consistent 2-D Monte Carlo simulations of InSb APD.

First-principles calculations of 2x2 reconstructions of GaN(0001) surfaces involving N, Al, Ga, In, and as atoms (2005)
Journal Article
Timon, V., Brand, S., Clark, S., Gibson, M., & Abram, R. (2005). First-principles calculations of 2x2 reconstructions of GaN(0001) surfaces involving N, Al, Ga, In, and as atoms. Physical review B, 72(3), https://doi.org/10.1103/physrevb.72.035327

The ab initio studies presented here employed a pseudopotential-plane-wave method in order to obtain the minimum-energy configurations of various 22 GaN0001 surfaces involving N, Al, Ga, In, and As atoms. Comparison of the various possible reconstruc... Read More about First-principles calculations of 2x2 reconstructions of GaN(0001) surfaces involving N, Al, Ga, In, and as atoms.

Disorder induced modification of reflection and transmission spectra of a two-dimensional photonic crystal with an incomplete band-gap (2005)
Journal Article
Beggs, D., Kaliteevski, M., Brand, S., Abram, R., Cassagne, D., & Albert, J. (2005). Disorder induced modification of reflection and transmission spectra of a two-dimensional photonic crystal with an incomplete band-gap. Journal of Physics: Condensed Matter, 17(26), 4049-4055. https://doi.org/10.1088/0953-8984/17/26/005

Transmission and reflection of light in disordered two-dimensional photonic crystals with an incomplete photonic band-gap have been modelled for various levels of disorder. It is found that ballistic and scattered light display different behaviours a... Read More about Disorder induced modification of reflection and transmission spectra of a two-dimensional photonic crystal with an incomplete band-gap.

Ab initio dynamics study of poly-para-phenylene vinylene (2005)
Journal Article
Zheng, G., Clark, S., Tulip, P., Brand, S., & Abram, R. (2005). Ab initio dynamics study of poly-para-phenylene vinylene. The Journal of Chemical Physics, 123(2), Article 024904. https://doi.org/10.1063/1.1955516

We present an ab initio dynamics investigation within a density-functional perturbation theory framework of the properties of the conjugated polymer poly-para-phenylene vinylene (PPV) in both the isolated chain and crystalline states. The calculated... Read More about Ab initio dynamics study of poly-para-phenylene vinylene.

Monte Carlo simulations of high-speed InSb-InAlSb FETs (2005)
Journal Article
Herbert, D., Childs, P., Abram, R., Crow, G., & Walmsley, M. (2005). Monte Carlo simulations of high-speed InSb-InAlSb FETs. IEEE Transactions on Electron Devices, 52(6), 1072-1078. https://doi.org/10.1109/ted.2005.848115

Self consistent Monte Carlo simulations which include impact ionization are used to study the high-speed potential of InSb field-effect transistors. It is found that the impact ionization has a strong influence on the performance of InSb for high spe... Read More about Monte Carlo simulations of high-speed InSb-InAlSb FETs.

Disorder-induced modification of the transmission of light through two-dimensional photonic crystals (2005)
Journal Article
Beggs, D., Kaliteevski, M., Abram, R., Cassagne, D., & Albert, J. (2005). Disorder-induced modification of the transmission of light through two-dimensional photonic crystals. Journal of Physics: Condensed Matter, 17(12), 1781-1790. https://doi.org/10.1088/0953-8984/17/12/002

Disordered two-dimensional photonic crystals with a complete photonic band-gap have been investigated. Transmission and reflection spectra have been modelled for both ballistic and scattered light. The density of states and electromagnetic field prof... Read More about Disorder-induced modification of the transmission of light through two-dimensional photonic crystals.

Waveguide polaritons: interaction of a quantum well exciton with an electromagnetic mode of a planar waveguide (2005)
Journal Article
Beggs, D., Kaliteevski, M., Brand, S., Abram, R., & Kavokin, A. (2005). Waveguide polaritons: interaction of a quantum well exciton with an electromagnetic mode of a planar waveguide. Physica status solidi. C, Current topics in solid state physics (Internet), 2(2), 787-790. https://doi.org/10.1002/pssc.200460347

A transfer matrix method has been used to calculate the dispersion relations of planar dielectric waveguides containing quantum well excitons. It is found that waveguide polaritons are formed, whose dispersion displays the classic anti-crossing behav... Read More about Waveguide polaritons: interaction of a quantum well exciton with an electromagnetic mode of a planar waveguide.

Theoretical adlayer surface morphology of wurtzite 2 × 2 reconstructions of the GaN (0001) surface (2005)
Journal Article
Timon, V., Brand, S., Clark, S., & Abram, R. (2005). Theoretical adlayer surface morphology of wurtzite 2 × 2 reconstructions of the GaN (0001) surface. Journal of Physics: Condensed Matter, 17(1), 17-26. https://doi.org/10.1088/0953-8984/17/1/002

In the first-principles calculations presented here we employ a density functional formalism using a pseudopotential plane-wave basis set in order to obtain the minimum energy configurations of various GaN(0001) 2 × 2 surfaces involving N atoms. The... Read More about Theoretical adlayer surface morphology of wurtzite 2 × 2 reconstructions of the GaN (0001) surface.

The interaction of quantum well excitons with evanescent EM waves and the spectroscopy of waveguide polaritons (2005)
Presentation / Conference Contribution
Beggs, D., Kaliteevski, M., Brand, S., Abram, R., & Kavokin, A. (2005). The interaction of quantum well excitons with evanescent EM waves and the spectroscopy of waveguide polaritons. In J. Menéndez, & C. G. Van de Walle (Eds.), . https://doi.org/10.1063/1.1994526

A transfer matrix method has been used to calculate the dispersion relations of planar dielectric waveguides (WGs) containing quantum well (QW) excitons. It is found that WG polaritons are formed, whose dispersion displays the classic anti-crossing b... Read More about The interaction of quantum well excitons with evanescent EM waves and the spectroscopy of waveguide polaritons.

First-principles calculations of 2×2 reconstructions of GaN surfaces (2005)
Presentation / Conference Contribution
Salinero, V., Gibson, M., Brand, S., Clark, S., & Abram, R. (2005). First-principles calculations of 2×2 reconstructions of GaN surfaces. In J. Menéndez, & C. G. Van de Walle (Eds.), . https://doi.org/10.1063/1.1994143

e GaN and other group III nitrides have great importance in a wide range of technological applications. Difficulty in growing good quality epitaxial GaN currently prevents the full technological potential of this material. The ab initio studies prese... Read More about First-principles calculations of 2×2 reconstructions of GaN surfaces.

First-principles studies of the structural and electronic properties of poly-para-phenylene vinylene (2004)
Journal Article
Zheng, G., Clark, S., Brand, S., & Abram, R. (2004). First-principles studies of the structural and electronic properties of poly-para-phenylene vinylene. Journal of Physics: Condensed Matter, 16(47), 8609-8620. https://doi.org/10.1088/0953-8984/16/47/013

We present first-principles investigations of the structural and electronic properties of PPV in both the isolated chain and the crystalline state. The calculations are mainly based on the local density approximation within density functional theory.... Read More about First-principles studies of the structural and electronic properties of poly-para-phenylene vinylene.

Etched Bragg reflectors as two-dimensional photonic crystals (2004)
Journal Article
Beggs, D., Kaliteevski, M., & Abram, R. (2004). Etched Bragg reflectors as two-dimensional photonic crystals. Journal of Physics: Condensed Matter, 16(45), 8093-8099. https://doi.org/10.1088/0953-8984/16/45/031

We have studied GaAs/oxidized AlAs (AlOx) Bragg reflectors with etched air grooves running parallel to the growth direction. Such structures possess periodic modulation of the refractive index in two dimensions, and we have found that they have a pho... Read More about Etched Bragg reflectors as two-dimensional photonic crystals.

Analysis of the dynamics of a blue-violet In<SUB>x</SUB> Ga<SUB>1-x</SUB> N laser with a saturable absorber (2004)
Journal Article
Tronciu, V., Yamada, M., & Abram, R. (2004). Analysis of the dynamics of a blue-violet Inx Ga1-x N laser with a saturable absorber. Physical review E: Statistical, nonlinear, and soft matter physics, 70(2), https://doi.org/10.1103/physreve.70.026604

We report the results of numerical investigations of the dynamical behavior of a blue-violet InGaN laser with a specially incorporated saturable absorber. We have identified the nature of the bifurcation that occurs in the device dynamics and also th... Read More about Analysis of the dynamics of a blue-violet In<SUB>x</SUB> Ga<SUB>1-x</SUB> N laser with a saturable absorber.

Interaction of quantum well excitons with evanescent plane electromagnetic waves (2004)
Journal Article
Beggs, D., Kaliteevski, M., Brand, S., Abram, R., Nikolaev, V., & Kavokin, A. (2004). Interaction of quantum well excitons with evanescent plane electromagnetic waves. Journal of Physics: Condensed Matter, 16(20), 3401-3409. https://doi.org/10.1088/0953-8984/16/20/011

A formalism based on non-local dielectric response theory and Green function techniques has been developed to describe the interaction of quantum well excitons with an evanescent optical wave of a planar waveguide. Reflection spectra of a system in w... Read More about Interaction of quantum well excitons with evanescent plane electromagnetic waves.

A theoretical and experimental investigation of the dynamics of tandem blue-violet lasers (2004)
Journal Article
Tronciu, V., Yamada, M., Kawakami, T., Ito, S., Ohno, T., Taneya, M., & Abram, R. (2004). A theoretical and experimental investigation of the dynamics of tandem blue-violet lasers. Optics Communications, 235(4-6), 409-414. https://doi.org/10.1016/j.optcom.2004.02.070

Theoretical and experimental investigations have been carried out to study the dynamics of blue–violet lasers with two regions that are adjacent in the longitudinal direction. The theoretical results show that both CW and self-pulsating operations ar... Read More about A theoretical and experimental investigation of the dynamics of tandem blue-violet lasers.

Directionality of light transmission and reflection in two-dimensional Penrose tiled photonic quasicrystals (2004)
Journal Article
Kaliteevski, M., Brand, S., & Abram, R. (2004). Directionality of light transmission and reflection in two-dimensional Penrose tiled photonic quasicrystals. Journal of Physics: Condensed Matter, 16(8), 1269-1278. https://doi.org/10.1088/0953-8984/16/8/010

We have investigated the directionality in the reflection and transmission spectra of Penrose-type photonic quasicrystals. In the frequency interval considered, there are two omnidirectional stopbands. It is found that for the low-frequency stopband... Read More about Directionality of light transmission and reflection in two-dimensional Penrose tiled photonic quasicrystals.