Constant growth of V-groove AlGaAs/GaAs multilayers on submicron gratings for complex optical devices

Son, Chang-Sik; Kim, Tae Geun; Wang, Xue Lun; Ogura, Mutsuo

doi:10.1016/s0022-0248(00)00686-2

Cited by 17 publications

(7 citation statements)

References 14 publications

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“…The small-slopes condition requires that Ak x , 1. It is immediate to verify (performing a simple substitution in eq 4) that such Fourier mode evolves with time in a shape-preserving way, according to the following equation: From eq 5, the sinusoidal pattern evolves in time exponentially decreasing its amplitude, with a lifetime proportional to λ 4 . Now, we shall consider a patch of the pattern of sides λ and L y along the x and y directions, respectively.…”

Section: Simulational Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Surface Relaxation of High-Aspect-Ratio Nanostructures: Theory and Experiments

Castez¹,

Claro²,

Schilardi³

et al. 2010

J. Phys. Chem. C

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We discuss some characteristic phenomena that take place when high-aspect-ratio metallic nanopatterns decay by surface diffusion. We compare results obtained by means of a continuous 2D model, a kinetic 3D Monte Carlo model, and also experimental results in which nanostructured Au surfaces decay during an annealing. In all of these cases, we found structures that are very stable against surface diffusion currents in which the surface area is much higher than the one associated with a compact material. According to our models, such structures usually are complex surfaces exhibing voids, tunnels, channels, etc., and they are very different from the compact shapes expected after the annealing of low-aspect-ratio metallic nanopatterns.

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Section: Simulational Methodsmentioning

confidence: 99%

“…Over the past few years the importance of controlling and changing shapes in the nanoworld has been emphasized. – Thermal treatments are commonly used to change the microstructure of polycrystalline materials; however, they can also be used in a controlled way to modify morphological features at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Surface Relaxation of High-Aspect-Ratio Nanostructures: Theory and Experiments

Castez¹,

Claro²,

Schilardi³

et al. 2010

J. Phys. Chem. C

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“…Within the last decade, from V-grooved (001) GaAs substrates, it has been possible to grow high-quality site-controlled InGaAsN VGQWs via modulated-flux metal-organic vapor phase epitaxy [11], or low-pressure metal-organic chemical vapor deposition [12,13]. The broad set of technological applications for nano-electronics based in VGQWs structures, ranging from VGQW lasers [8,14,15], pMOSFETs [16], 1.3 µm wavelength emitters [11], to VGQW AlGaAs/GaAs multilayers for complex optical devices [17], is still stimulating theoretical [18][19][20] and experimental [20,21] investigations.…”

Section: Introductionmentioning

confidence: 99%

Spectral features and optical absorption of vertically stacked V-groove quantum wires

et al. 2022

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The spectral features and the linear, nonlinear, and total optical absorption coefficients of two realistic $$\mathrm {GaAs/Ga}_{1-x}{\mathrm{Al}}_x{\mathrm{As}}$$ GaAs / Ga 1 - x Al x As vertically stacked V-groove quantum wires confining electronic states were theoretically studied. The compact density matrix formalism and the finite element method were used as solution frameworks. The influence of the barrier width, inter-sidewall angle, the crescent thickness of the stack, and the influence of a static electric field on the energy spectrum and the optical coefficients is addressed. Increasing the crescent thickness (inter-sidewall angle) leads to a reduction (non-monotonous increase) of the energy values, while the presence of a static electric field leads to controllable stark-like patterns. In all cases, anti-crossing points are reported. By increasing the crescent thickness, inter-sidewall angle, or barrier width, a non-monotonous blue-/red-shift of the resonant peaks of the optical absorption is observed. In addition, the results in asymmetric/symmetric vertically coupled V-groove quantum wire systems suggest that the quantum tunneling phenomenon can be linked to the enhancement of the total optical absorption due to the possibility of the generation of dipole moments by higher electron mobility. Thus, optical fields oriented along the growth direction enhance the optical absorption. Furthermore, the absorption coefficient maximum is drastically modified by varying the inter-sidewall angle, and even the evolution tendency can be inverted due to the anti-crossing points in the energy spectra. Since the obtained resonant peaks are located below 20 meV in the spectra, the analyzed system could be interesting for exploring and designing new Terahertz devices.

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“…During the last decades, there has been great interest, from both the theoretical and the experimental points of view, in the study of the evolution of micro/nanostructures. − Far from decreasing, this interest has even grown and the changing shapes and interface evolution in the nanoworld have become a very active field of research during the last years. − It is expected that the spread of experimental techniques that allow greater control of materials at the nanoscale and the release of more powerful computers will lead to a deeper comparison between experiments and computer simulations in the near future, further stimulating the interest in surface science at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Decay of Nanopatterns: A Comparative Study between a Continuum Description and a Discrete Monte Carlo Approach

Castez

Albano

2007

J. Phys. Chem. C

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The surface-diffusion-driven decay of 2-dimensional periodic nanopatterns is studied by means of a kinetic Monte Carlo model. Activation energy barriers are computed by using a harmonic approach. Accounting for the proper rates of all processes involved allows us to implement a real time algorithm. Thus, the relationship between real time and Monte Carlo time is discussed. By using this discrete approach, we recover the most relevant results expected from the linear theory of surface diffusion for initial surfaces within the small-slope approximation. We also focus on the decay kinetics of periodic nanopatterns (sinusoidal and rectangular) starting from nonequilibrium states far from the small-slope approximation. In this case, we found a nonexponential decay as well as the emergence of several interesting nanostructures (overhangs, nanoislands, nanovoids, etc.), which depend on the geometrical properties (e.g., the aspect ratio) of the initial pattern. We compare results obtained by using the proposed discrete model with the expectations of the standard continuous theory of surface diffusion, and we show that many qualitative aspects are common to both approaches, in spite of the important differences between both descriptions.

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Constant growth of V-groove AlGaAs/GaAs multilayers on submicron gratings for complex optical devices

Cited by 17 publications

References 14 publications

Surface Relaxation of High-Aspect-Ratio Nanostructures: Theory and Experiments

Surface Relaxation of High-Aspect-Ratio Nanostructures: Theory and Experiments

Spectral features and optical absorption of vertically stacked V-groove quantum wires

Modeling the Decay of Nanopatterns: A Comparative Study between a Continuum Description and a Discrete Monte Carlo Approach

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