Pub Date : 2007-10-15DOI: 10.1109/NUSOD.2007.4349006
S. Riyopoulos
Greatly enhanced radiation extraction has been observed through randomly textured interfaces with feature sizes comparable to the wavelength, where ray tracing approaches fail. A numerical tool is introduced based on spectral decomposition and supercritical scattering. A quasi- periodic interface destroys the k|| invariance, introducing wave-numbers shifted by structure period harmonics, and allows transmission for supercritical incidence. Converting the interface boundary conditions into effective current source terms yield integral formulas for the transmitted fraction including quasi-periodic, sub-wavelength surface features with random variation of the feature size and period.
{"title":"Enhanced light extraction from textured surfaces with sub-wavelength size features: beyond the ray tracing approximation","authors":"S. Riyopoulos","doi":"10.1109/NUSOD.2007.4349006","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349006","url":null,"abstract":"Greatly enhanced radiation extraction has been observed through randomly textured interfaces with feature sizes comparable to the wavelength, where ray tracing approaches fail. A numerical tool is introduced based on spectral decomposition and supercritical scattering. A quasi- periodic interface destroys the k|| invariance, introducing wave-numbers shifted by structure period harmonics, and allows transmission for supercritical incidence. Converting the interface boundary conditions into effective current source terms yield integral formulas for the transmitted fraction including quasi-periodic, sub-wavelength surface features with random variation of the feature size and period.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"42 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":"116679177","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.2007.4349007
Qiaoqiang Gan, Z. Fu, Y.J. Ding, F. Bartoli
In this paper, we demonstrate a unidirectional subwavelength slit coupler at THz frequencies by using two-dimensional finite difference time domain (FDTD) modeling. The near-field light emitted from the narrow slit serves as a subwavelength-scaled excitation source. By placing a particular grating structure on one side of the slit, the light could be guided in only one direction. This unidirectional subwavelength slit coupler is amenable to incorporation into optical integrated circuits at THz frequencies.
{"title":"Design of unidirectional subwavelength slit coupler for THz surface plasmons","authors":"Qiaoqiang Gan, Z. Fu, Y.J. Ding, F. Bartoli","doi":"10.1109/NUSOD.2007.4349007","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349007","url":null,"abstract":"In this paper, we demonstrate a unidirectional subwavelength slit coupler at THz frequencies by using two-dimensional finite difference time domain (FDTD) modeling. The near-field light emitted from the narrow slit serves as a subwavelength-scaled excitation source. By placing a particular grating structure on one side of the slit, the light could be guided in only one direction. This unidirectional subwavelength slit coupler is amenable to incorporation into optical integrated circuits at THz frequencies.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"147 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":"133167006","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.2007.4348995
S. Rudin, E. Bellotti, G. Garrett, M. Wraback
The fast carrier dynamics in GaN under short laser pulse excitation is investigated theoretically, using a density matrix approach, and experimentally, using time-resolved photoluminescence. The rise time of the photoluminescence is determined by carrier scattering with LO phonons .
{"title":"Hot Carrier Dynamics and Coherent Effects in GaN under Short Laser Pulse Excitation","authors":"S. Rudin, E. Bellotti, G. Garrett, M. Wraback","doi":"10.1109/NUSOD.2007.4348995","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4348995","url":null,"abstract":"The fast carrier dynamics in GaN under short laser pulse excitation is investigated theoretically, using a density matrix approach, and experimentally, using time-resolved photoluminescence. The rise time of the photoluminescence is determined by carrier scattering with LO phonons .","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"391 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":"131763595","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.2007.4349041
S. Ibrahim, X. Song, M. Sugiyama, Y. Nakano
Based on the FD-BPM and including the distribution of photon density, carrier density, and refractive index, a simulation code is used to analyze the static performance of active MMI couplers in the presence of two different optical signals. To examine the feasibility of a novel all-optical switch based on active MMI; the code is mainly used to evaluate the amount of phase change resulting in the output of one optical signal by varying the intensity of the other at different injected carrier density.
{"title":"Simulation of Static Optical XPM in Active MMI Couplers","authors":"S. Ibrahim, X. Song, M. Sugiyama, Y. Nakano","doi":"10.1109/NUSOD.2007.4349041","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349041","url":null,"abstract":"Based on the FD-BPM and including the distribution of photon density, carrier density, and refractive index, a simulation code is used to analyze the static performance of active MMI couplers in the presence of two different optical signals. To examine the feasibility of a novel all-optical switch based on active MMI; the code is mainly used to evaluate the amount of phase change resulting in the output of one optical signal by varying the intensity of the other at different injected carrier density.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"8 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":"116784467","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.2007.4349026
M. Grupen, P. Sotirelis, S. Wong, J. Albrecht, R. Bedford, S. Maley
A unique discretization scheme that couples Maxwell's full wave vector field equations self-consistently with nonlinear charge and energy transport is presented. The scheme is used to simulate how terahertz modulation bandwidths may be achieved in a simple electrically pumped quantum well laser diode by dynamically heating the degenerate quantum charge gases with high frequency radiation.
{"title":"Full Wave Electromagnetics for Simulating Terahertz Quantum Well Laser Diode Modulation","authors":"M. Grupen, P. Sotirelis, S. Wong, J. Albrecht, R. Bedford, S. Maley","doi":"10.1109/NUSOD.2007.4349026","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349026","url":null,"abstract":"A unique discretization scheme that couples Maxwell's full wave vector field equations self-consistently with nonlinear charge and energy transport is presented. The scheme is used to simulate how terahertz modulation bandwidths may be achieved in a simple electrically pumped quantum well laser diode by dynamically heating the degenerate quantum charge gases with high frequency radiation.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"60 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":"115799164","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.2007.4349012
X. Jin, B. Zhang, S. Jobe, J. DeLeon, J. Flickinger, T. Dai, G. Zhang, E. Heller, L. Chen
We present two-dimension gallium nitride (GaN) quantum-well (QW) diode laser (LD) simulation using Rsoft LaserMOD. The optical mode patterns are calculated and analyzed by the transfer matrix and Ritz Iteration. Our study is focus on the ghost mode reduction in the GaN laser design and laser performance.
{"title":"Two-Dimension Simulation of Gallium Nitride-Based Laser Diode","authors":"X. Jin, B. Zhang, S. Jobe, J. DeLeon, J. Flickinger, T. Dai, G. Zhang, E. Heller, L. Chen","doi":"10.1109/NUSOD.2007.4349012","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349012","url":null,"abstract":"We present two-dimension gallium nitride (GaN) quantum-well (QW) diode laser (LD) simulation using Rsoft LaserMOD. The optical mode patterns are calculated and analyzed by the transfer matrix and Ritz Iteration. Our study is focus on the ghost mode reduction in the GaN laser design and laser performance.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"39 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":"126282017","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.2007.4349008
S.C. Chen, K. Chiu, D. Tsai
A corrugated metal thin film can enhance the emission of light-emitting devices by the assistance of radiative surface plasmons. But, away from the resonant frequency, the metal thin film has a shielding effect on transmission. We replace the corrugated thin film by a discontinuous metal nanostructure, the isolated metal nanohemispheres can induce localized surface plasmons. The angular dependence and two different wavelengths are studied. The reflection on dielectric layers may be reduced and the transmission could be raised by the localized surface plasmons even the resonance condition is not fulfilled. The scattered Ey component is sensitive to the tilt angle, it might be useful to some novel applications.
{"title":"Optical Waves Transmission Raised by Localized Surface Plasmons","authors":"S.C. Chen, K. Chiu, D. Tsai","doi":"10.1109/NUSOD.2007.4349008","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349008","url":null,"abstract":"A corrugated metal thin film can enhance the emission of light-emitting devices by the assistance of radiative surface plasmons. But, away from the resonant frequency, the metal thin film has a shielding effect on transmission. We replace the corrugated thin film by a discontinuous metal nanostructure, the isolated metal nanohemispheres can induce localized surface plasmons. The angular dependence and two different wavelengths are studied. The reflection on dielectric layers may be reduced and the transmission could be raised by the localized surface plasmons even the resonance condition is not fulfilled. The scattered Ey component is sensitive to the tilt angle, it might be useful to some novel applications.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"85 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":"126313665","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.2007.4348999
N. Matuschek
Depending on their application high-power semiconductor laser devices have to be optimized with respect to various design parameters. We discuss the simulation and optimization of the device performance with respect to electrical and thermal properties, output power, wavelength stability, and device reliability using the example of our latest pump-laser generation that has been developed and qualified to support the high-end market of erbium-doped fiber amplifiers. Modeled and measured device properties are compared at each design step. Based on an overall optimization of the device performance fiber Bragg grating (FBG) stabilized telecom-grade pump-laser modules have been realized yielding 750 mW fiber-coupled light output power.
{"title":"Simulation and Optimization of High-Power Semiconductor Lasers and Modules","authors":"N. Matuschek","doi":"10.1109/NUSOD.2007.4348999","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4348999","url":null,"abstract":"Depending on their application high-power semiconductor laser devices have to be optimized with respect to various design parameters. We discuss the simulation and optimization of the device performance with respect to electrical and thermal properties, output power, wavelength stability, and device reliability using the example of our latest pump-laser generation that has been developed and qualified to support the high-end market of erbium-doped fiber amplifiers. Modeled and measured device properties are compared at each design step. Based on an overall optimization of the device performance fiber Bragg grating (FBG) stabilized telecom-grade pump-laser modules have been realized yielding 750 mW fiber-coupled light output power.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"4 4 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":"134619422","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.2007.4349011
Jongwoon Park, Seoung-Hwan Park, Bumho Choi, Jongho Lee
We have fabricated white organic light-emitting diodes (WOLEDs) based on dual partial dye doping. To clearly understand the underlying physics of the OLED structures, we have also implemented a comprehensive numerical model and performed simulations of the structures.
{"title":"White Organic Light-Emitting Diodes Based on Dual Partial Dye Doping","authors":"Jongwoon Park, Seoung-Hwan Park, Bumho Choi, Jongho Lee","doi":"10.1109/NUSOD.2007.4349011","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349011","url":null,"abstract":"We have fabricated white organic light-emitting diodes (WOLEDs) based on dual partial dye doping. To clearly understand the underlying physics of the OLED structures, we have also implemented a comprehensive numerical model and performed simulations of the structures.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"160 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":"133599557","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.2007.4349030
D. Lasaosa, M. Vega-Leal, C. Fañanas
We present a simple and effective way to generate a time-domain description of laser light, including amplitude and phase noise, and their correlation, through numerical solution of density rate equations with random process rates. The simulation algorithm is outlined, and the results are compared with theoretical predictions, showing very good agreement.
{"title":"Time-domain Simulation of Semiconductor Laser Light with Correlated Amplitude and Phase Noises","authors":"D. Lasaosa, M. Vega-Leal, C. Fañanas","doi":"10.1109/NUSOD.2007.4349030","DOIUrl":"https://doi.org/10.1109/NUSOD.2007.4349030","url":null,"abstract":"We present a simple and effective way to generate a time-domain description of laser light, including amplitude and phase noise, and their correlation, through numerical solution of density rate equations with random process rates. The simulation algorithm is outlined, and the results are compared with theoretical predictions, showing very good agreement.","PeriodicalId":255219,"journal":{"name":"2007 International Conference on Numerical Simulation of Optoelectronic Devices","volume":"25 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":"129082021","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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