Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349001
R. MacKenzie, J.J. Lim, S. Bull, S. Sujecki, E. Larkins
A state-of-the-art electro-optical-thermal simulation tool is enhanced to include the effect of phonon reflections at epitaxial interfaces. A detailed numerical investigation of the alteration in electron/hole/phonon scattering rates and heat fluxes due to the thermal boundary resistance at hetero-junctions and epitaxial interfaces is carried out. The heat flux in a 1.3 mum edge-emitting laser and through VCSEL mirrors is considered. An increase in QW temperature within the edge-emitting laser of up to 0.3 K is observed.
{"title":"Thermal Boundary Resistance in Optoelectronic Devices","authors":"R. MacKenzie, J.J. Lim, S. Bull, S. Sujecki, E. Larkins","doi":"10.1109/NUSOD.2007.4349001","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349001","url":null,"abstract":"A state-of-the-art electro-optical-thermal simulation tool is enhanced to include the effect of phonon reflections at epitaxial interfaces. A detailed numerical investigation of the alteration in electron/hole/phonon scattering rates and heat fluxes due to the thermal boundary resistance at hetero-junctions and epitaxial interfaces is carried out. The heat flux in a 1.3 mum edge-emitting laser and through VCSEL mirrors is considered. An increase in QW temperature within the edge-emitting laser of up to 0.3 K is observed.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121177596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349010
H. M. Masoudi
A novel non-paraxial time-domain technique based on Pade approximant for modeling ultra short optical pulses has been formulated and tested. The new method is an extension to the parabolic time-domain beam propagation method (TD-BPM) that solves the time domain wave equation along one direction that allows the time window to follow the evolution of the pulse. In this work the technique was applied efficiently and effectively to model ultra short pulses in dielectric optical waveguides.
{"title":"Modeling Ultra Short Optical Pulse Propagation In Integrated Optical Waveguides Using A New Time Domain Technique","authors":"H. M. Masoudi","doi":"10.1109/NUSOD.2007.4349010","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349010","url":null,"abstract":"A novel non-paraxial time-domain technique based on Pade approximant for modeling ultra short optical pulses has been formulated and tested. The new method is an extension to the parabolic time-domain beam propagation method (TD-BPM) that solves the time domain wave equation along one direction that allows the time window to follow the evolution of the pulse. In this work the technique was applied efficiently and effectively to model ultra short pulses in dielectric optical waveguides.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134287396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349032
N. Zakhleniuk
The authors present analytical microscopic theory and numerical simulation of high-field hot-electron effects in highspeed p-i-n and uni-travelling carrier (UTC) photodetectors (PDs), using both the drift-diffusion (DD) and hydrodynamic (HD) models for steady-state and transient regimes. It is shown that the current models of drift mobility in DD transport are not applicable for strongly inhomogeneous systems with built-in fields. A new DD mobility model is suggested. Comparative analysis of DD and HD modeling results is carried out and it is shown that the HD model adequately describes operation of high-speed PDs excited by short sub-picosecond optical pulses.
{"title":"Theory and Modelling of High-Field Carrier Transport in High-Speed Photodetectors","authors":"N. Zakhleniuk","doi":"10.1109/NUSOD.2007.4349032","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349032","url":null,"abstract":"The authors present analytical microscopic theory and numerical simulation of high-field hot-electron effects in highspeed p-i-n and uni-travelling carrier (UTC) photodetectors (PDs), using both the drift-diffusion (DD) and hydrodynamic (HD) models for steady-state and transient regimes. It is shown that the current models of drift mobility in DD transport are not applicable for strongly inhomogeneous systems with built-in fields. A new DD mobility model is suggested. Comparative analysis of DD and HD modeling results is carried out and it is shown that the HD model adequately describes operation of high-speed PDs excited by short sub-picosecond optical pulses.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128677255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4348997
M. Langner, R. Gehlhaar, C. Schriever, H. Frob, V. Lyssenko, K. Leo
We investigate the optical properties of laterally confined organic microcavities. For preparation, a shadow mask deposition technique is used, which results in laterally shaped organic dots with micrometer size as the cavity layer. To describe the steady state electric field distribution in these structures, a simplified box model is applied. The complex mode structure measured in transmission and photoluminescence is simulated by transfer matrix calculations and a Fourier transform of the internal electric field distribution.
{"title":"Near and far field observation of optical confinement in non-destructive fabricated organic photonic dots","authors":"M. Langner, R. Gehlhaar, C. Schriever, H. Frob, V. Lyssenko, K. Leo","doi":"10.1109/NUSOD.2007.4348997","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4348997","url":null,"abstract":"We investigate the optical properties of laterally confined organic microcavities. For preparation, a shadow mask deposition technique is used, which results in laterally shaped organic dots with micrometer size as the cavity layer. To describe the steady state electric field distribution in these structures, a simplified box model is applied. The complex mode structure measured in transmission and photoluminescence is simulated by transfer matrix calculations and a Fourier transform of the internal electric field distribution.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123193120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349035
K. Gartner
The paper summarizes properties of Delaunay grids, Voronoi diagrams and presents a weak formulation of the Scharfetter-Gummel-scheme on d dimensional simplex grids. Other technical details, like the weak discrete maximum principle, are introduced, too. The advantage of the formalism is a direct 'reuse' of analytic results to obtain the discrete estimates. The results of (Zlamal, 1984) (restricted to the non obtuse angle case) can be extended in more detail to relevant 3d situations.
{"title":"Existence of bounded discrete steady state solutions of the van Roosbroeck system on boundary conforming Delaunay grids","authors":"K. Gartner","doi":"10.1109/NUSOD.2007.4349035","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349035","url":null,"abstract":"The paper summarizes properties of Delaunay grids, Voronoi diagrams and presents a weak formulation of the Scharfetter-Gummel-scheme on d dimensional simplex grids. Other technical details, like the weak discrete maximum principle, are introduced, too. The advantage of the formalism is a direct 'reuse' of analytic results to obtain the discrete estimates. The results of (Zlamal, 1984) (restricted to the non obtuse angle case) can be extended in more detail to relevant 3d situations.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132393201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4348996
Jingyi Xiong, M. Colice, F. Schlottau, K. Wagner, B. Fornberg
Rare-earth-doped crystals can be modelled as inhomogeneously broadened two-level atoms. Beam propagation in the crystals can be described by the Maxwell-Bloch equations. We numerically solve Maxwell's equations by using the FFT-finite difference beam propagation method and the Bloch equations by using the finite difference method. Numerical simulation results are given for an off-axis 3-pulse photon echo.
{"title":"Simulations of 2D Maxwell-Bloch equations","authors":"Jingyi Xiong, M. Colice, F. Schlottau, K. Wagner, B. Fornberg","doi":"10.1109/NUSOD.2007.4348996","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4348996","url":null,"abstract":"Rare-earth-doped crystals can be modelled as inhomogeneously broadened two-level atoms. Beam propagation in the crystals can be described by the Maxwell-Bloch equations. We numerically solve Maxwell's equations by using the FFT-finite difference beam propagation method and the Bloch equations by using the finite difference method. Numerical simulation results are given for an off-axis 3-pulse photon echo.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126537630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349015
S. A. Gaikwad, D. S. Patil, D. Gautam
The computer aided simulation tools have been developed using static device modeling approach for the analysis and optimisation of various physical parameters of the semiconductor lasers.The optical field distribution in various layers across the device is obtained by solving the wave equation. The modal analysis of optical confinement in three layer slab waveguide structure is carried out to obtain the optimized set of structural parameters for maximum intensity at 375 nm wavelength. The basic electrical equations have been implemented in discretized form and solved numerically to obtain the electrostatic potential and quasi Fermi potential at various nodes across the finite difference mesh of the device structure. The self consistent solution of basic electrical and optical equations has been obtained by iterative solution procedure. Recombination rates which have dependency on carrier concentration and recombination coefficient have been determined using various models at individual mesh points of the device. Temperature dependent analysis of recombination coefficient, band gap, refractive index, threshold current density, near field intensity, mirror loss in cavity, effective index has been carried out to explore applicability of nitride lasers at higher temperatures.
{"title":"Modeling and Simulation of GaN/AlGaN Laser and Temperature Dependent Analysis of Physical Parameters","authors":"S. A. Gaikwad, D. S. Patil, D. Gautam","doi":"10.1109/NUSOD.2007.4349015","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349015","url":null,"abstract":"The computer aided simulation tools have been developed using static device modeling approach for the analysis and optimisation of various physical parameters of the semiconductor lasers.The optical field distribution in various layers across the device is obtained by solving the wave equation. The modal analysis of optical confinement in three layer slab waveguide structure is carried out to obtain the optimized set of structural parameters for maximum intensity at 375 nm wavelength. The basic electrical equations have been implemented in discretized form and solved numerically to obtain the electrostatic potential and quasi Fermi potential at various nodes across the finite difference mesh of the device structure. The self consistent solution of basic electrical and optical equations has been obtained by iterative solution procedure. Recombination rates which have dependency on carrier concentration and recombination coefficient have been determined using various models at individual mesh points of the device. Temperature dependent analysis of recombination coefficient, band gap, refractive index, threshold current density, near field intensity, mirror loss in cavity, effective index has been carried out to explore applicability of nitride lasers at higher temperatures.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"125 51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124039385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349029
M. Al-Mumin
The effect of gain-coupling on the predicted self- pulsations in weakly-coupled two section DFB lasers is studied and presented here. The introduction of gain-coupling 1) increases the minimum Bragg detuning needed for self- pulsations, 2) eliminates self-pulsations when the Bragg detuning exceeds the bandstop, 3) reduces the frequency tuning range of self-pulsations, 4) increases the modulation index over most of the tuning range. The study is limited to self-pulsations of the symmetrical mode beating type.
{"title":"The Effect of Gain-Coupling on Mode Beatings in Weakly Coupled Two-Section DFB Lasers","authors":"M. Al-Mumin","doi":"10.1109/NUSOD.2007.4349029","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349029","url":null,"abstract":"The effect of gain-coupling on the predicted self- pulsations in weakly-coupled two section DFB lasers is studied and presented here. The introduction of gain-coupling 1) increases the minimum Bragg detuning needed for self- pulsations, 2) eliminates self-pulsations when the Bragg detuning exceeds the bandstop, 3) reduces the frequency tuning range of self-pulsations, 4) increases the modulation index over most of the tuning range. The study is limited to self-pulsations of the symmetrical mode beating type.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127460470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349037
G. Slavcheva
We extend (Slavcheva, 2007) our new dynamical model (Slavcheva et al., 2006) for resonant coherent circularly polarized optical pulse interactions with charged semiconductor quantum dots (QDs) to include dissipation in the system through the spin relaxation dynamics. A generalized pseudospin master equation is derived for description of the optically-induced time evolution of spin coherences and spin populations in terms of the real state pseudospin (coherence) vector. The equation is solved self-consistently with the vector Maxwell equations for the optical wave propagation coupled via macroscopic medium polarization. Using the model we demonstrate numerically coherent readout of a single spin polarization state exploiting the high-intensity Rabi oscillations regime. We show that coherent spin-polarization control can be achieved by varying the excitation intensity through the pulse area which allows for differentiation between the time traces of the polarized photoluminescence, thus enabling high-fidelity schemes for single spin detection. Longest-lived spin coherence is achieved for odd multiples of pi-excitations.
我们扩展了(Slavcheva, 2007)与带电半导体量子点(QDs)的共振相干圆极化光脉冲相互作用的新动力学模型(Slavcheva et al.， 2006)，通过自旋弛豫动力学将系统中的耗散包括在内。推导了一个广义伪自旋主方程，用实态伪自旋(相干)矢量描述自旋相干和自旋居群的光诱导时间演化。该方程与经宏观介质极化耦合的光波传播的矢量麦克斯韦方程组自一致求解。利用该模型，我们证明了利用高强度拉比振荡的单自旋偏振态的数值相干读出。我们表明，相干自旋偏振控制可以通过改变脉冲区域的激发强度来实现，这允许在偏振光致发光的时间迹之间进行区分，从而实现高保真的单自旋检测方案。最长寿命的自旋相干是在奇倍激发下实现的。
{"title":"Dynamical Model for Coherent Optical Control of a Single Confined Spin","authors":"G. Slavcheva","doi":"10.1109/NUSOD.2007.4349037","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349037","url":null,"abstract":"We extend (Slavcheva, 2007) our new dynamical model (Slavcheva et al., 2006) for resonant coherent circularly polarized optical pulse interactions with charged semiconductor quantum dots (QDs) to include dissipation in the system through the spin relaxation dynamics. A generalized pseudospin master equation is derived for description of the optically-induced time evolution of spin coherences and spin populations in terms of the real state pseudospin (coherence) vector. The equation is solved self-consistently with the vector Maxwell equations for the optical wave propagation coupled via macroscopic medium polarization. Using the model we demonstrate numerically coherent readout of a single spin polarization state exploiting the high-intensity Rabi oscillations regime. We show that coherent spin-polarization control can be achieved by varying the excitation intensity through the pulse area which allows for differentiation between the time traces of the polarized photoluminescence, thus enabling high-fidelity schemes for single spin detection. Longest-lived spin coherence is achieved for odd multiples of pi-excitations.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131262431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349016
P. Nyakas
The polarization-resolved optical modes of three-dimensional vertical-cavity surface-emitting lasers are calculated. The Helmholtz-equation is discretized on prism elements, and the resulting eigenproblem is solved by an efficient numerical technique. The full vectorial treatment enables one to determine the polarization characteristics of these lasers.
{"title":"Three-Dimensional VCSEL Simulation Using Vector Finite Elements","authors":"P. Nyakas","doi":"10.1109/NUSOD.2007.4349016","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349016","url":null,"abstract":"The polarization-resolved optical modes of three-dimensional vertical-cavity surface-emitting lasers are calculated. The Helmholtz-equation is discretized on prism elements, and the resulting eigenproblem is solved by an efficient numerical technique. The full vectorial treatment enables one to determine the polarization characteristics of these lasers.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132982186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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