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dc.contributor.authorChen, Liang
dc.contributor.authorSirenko, Kostyantyn
dc.contributor.authorBagci, Hakan
dc.date.accessioned2020-06-18T12:40:15Z
dc.date.available2020-06-18T12:40:15Z
dc.date.issued2020-05-29
dc.identifier.urihttp://hdl.handle.net/10754/663701.1
dc.description.abstractPhotoconductive devices (PCDs) enhanced with nanostructures have shown a significantly improved optical-to-terahertz conversion efficiency. While the experimental research on the development of such devices has progressed remarkably, simulation of these devices is still challenging due to the high computational cost resulting from modeling and discretization of complicated physical processes and intricate geometries. In this work, a discontinuous Galerkin (DG) method-based unit-cell scheme for efficient simulation of PCDs with periodic nanostructures is proposed. The scheme considers two physical stages of the device and model them using two coupled systems, i.e., a Poisson-drift-diffusion (DD) system describing the nonequilibrium steady state, and a Maxwell-DD system describing the transient stage. A "potential-drop" boundary condition is enforced on the opposing boundaries of the unit cell to mimic the effect of the bias voltage. Periodic boundary conditions are used for carrier densities and electromagnetic fields. The unit-cell model composed of these coupled equations and boundary conditions is discretized and solved using DG methods. The boundary conditions are enforced weakly through the numerical flux of DG. Numerical results show that the proposed DG-based unit-cell scheme models the device accurately but is significantly faster than the DG scheme that takes into account the whole device.
dc.description.sponsorshipThis research is supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No 2016-CRG5-2953. The authors would like to thank the KAUST Supercomputing Laboratory (KSL) for providing the required computational resources.
dc.publisherarXiv
dc.relation.urlhttps://arxiv.org/pdf/2006.02141
dc.rightsArchived with thanks to arXiv
dc.titleAn Efficient Discontinuous Galerkin Scheme for Simulating Terahertz Photoconductive Devices with Periodic Nanostructures
dc.typePreprint
dc.contributor.departmentComputational Electromagnetics Laboratory
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.eprint.versionPre-print
dc.contributor.institutionInstitute for Radiophysics and Electronics, National Academy of Sciences of Ukraine (IRE NASU), Kharkiv 61085, Ukraine.
dc.identifier.arxivid2006.02141
kaust.personChen, Liang
kaust.personBagci, Hakan
kaust.grant.number2016-CRG5-2953
refterms.dateFOA2020-06-18T12:40:55Z
kaust.acknowledged.supportUnitKAUST Supercomputing Laboratory (KSL)
kaust.acknowledged.supportUnitOffice of Sponsored Research (OSR)


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