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  1. Optical Analysis of Perovskite III-V Nanowires Interpenetrated Tandem Solar Cells

    This work presents an optical analysis and optimization of novel interpenetrated tandem solar cells combining perovskite top cells with indium phosphide (InP) nanowire (NW) array bottom cells. The study investigates both three-terminal (3T) and two-terminal (2T) configurations to minimize reflection and parasitic absorption losses. The optical modeling and rigorous electromagnetic simulations were performed using the finite element solver JCMsuite to calculate absorptance, reflectance, and photocurrent densities for various device geometries and material thicknesses.

    M. Tirrito, et al. Optical Analysis of Perovskite III-V Nanowires Interpenetrated Tandem Solar Cells. Nanomaterials, 14, 518 (2024).

    2024 DOI Publication link

    Photovoltaics, Advanced Finite Element Methods, Light Scattering Computation

  2. Poles and zeros in non-Hermitian systems: Application to photonics

    The authors present a contour-integration-based framework for computing poles and zeros of electromagnetic response functions in non-Hermitian photonic systems. They demonstrate the approach on a dielectric metasurface, determining complex-valued reflection zeros and poles, their sensitivities to geometric parameters, and performing residue-based modal expansions. The numerical simulations were performed using the finite-element Maxwell solver JCMsuite to solve scattering problems at complex frequencies along integration contours.

    F. Binkowski et al. Poles and zeros in non-Hermitian systems: Application to photonics. Phys. Rev. B 109, 045414 (2024).

    2024 DOI Publication link

    Metamaterials, diffractive optics, optical resonators and antennas, Advanced Finite Element Methods, Resonance Mode Computation

  3. Separating Material and Geometry Contributions to Circular Dichroism of Chiral Objects

    This study developed a multi-scale computational approach to disentangle the contributions of geometry and material chirality to the circular dichroism (CD) of chiral objects. The researchers used JCMsuite to perform full-wave finite element simulations, extracting transition matrices to compute the optical response of objects like helices and tetrahedral sphere arrangements. This enabled the separation of CD into geometry- and material-dependent parts, showing that their linear superposition accurately predicts total CD, even for resonant systems.

    L. Rebholz, et al. Separating the Material and Geometry Contribution to the Circular Dichroism of Chiral Objects Made from Chiral Media. ACS Photonics. 11, 1171-1179 (2024).

    2024 DOI Publication link

    Metamaterials, Optical Metrology and Sensing, optical chirality, Advanced Finite Element Methods

  4. Core-Shell Nanoparticle Resonances in Near-Field Microscopy Revealed by Fourier-demodulated Full-wave Simulations

    This work presents a detailed investigation of the near-field optical response of core-shell nanoparticles using Fourier-demodulated full-wave simulations. The authors employed JCMsuite to simulate the scattering-type scanning near-field optical microscopy (s-SNOM) measurement process for cylindrically symmetric samples. These simulations, which closely mimic the experimental procedure, were used to explore the complex interplay of geometrical and optical resonances within core-shell nanostructures, revealing significant resonance shifts and enhanced scattering effects.

    D. Dai, et al. Core-Shell Nanoparticle Resonances in Near-Field Microscopy Revealed by Fourier-demodulated Full-wave Simulations. Nano Letters, 24(43), 13747 (2024).

    2024 DOI Publication link

    Optical Metrology and Sensing, plasmonics, Advanced Finite Element Methods, Light Scattering Computation

  5. GaAs-on-insulator ridge waveguide nanobeam cavities with integrated InAs quantum dots

    This work investigates the design, fabrication, and optical characterization of nanobeam cavities on a GaAs-on-insulator platform with integrated InAs quantum dots for quantum photonic applications. JCMsuite was used to perform numerical simulations to optimize the cavity geometry, including the dimensions and periodicity of elliptical holes. These simulations predicted a high photon coupling efficiency of nearly 70% and a Purcell factor of approximately 28 for the optimized structure.

    Y. Zhou, et al. GaAs-on-insulator ridge waveguide nanobeam cavities with integrated InAs quantum dots. Mater. Quantum. Technol. 4, 025403 (2024).

    2024 DOI Publication link

    Light Sources, integrated optics, optical resonators and antennas, quantum optics, Advanced Finite Element Methods, Propagation Mode Computation

  6. Proposal for a Tunable Room-Temperature Single-Photon Source Based on a Plasmonic Nanoantenna Driven by Inelastic Tunneling

    This work proposes a novel nanoantenna design for generating single photons at room temperature via inelastic tunneling in the Coulomb blockade regime. The proposed "SelfSiM" (Self-Similar nanoparticle on Mirror) antenna merges concepts from nanoparticle-on-mirror and self-similar antennas to simultaneously boost the local density of optical states and achieve efficient photon outcoupling. The authors used JCMsuite to perform 3D finite-element method (FEM) simulations of Maxwell's equations, analyzing the antenna's Purcell factor, radiative efficiency, and eigenmodes to validate and optimize the design.

    G. Kewes and O. Benson. Proposal for a Tunable Room‐Temperature Single‐Photon Source Based on a Plasmonic Nanoantenna Driven by Inelastic Tunneling in the Coulomb Regime. Phys. Status Solidi A, 221, 2300366 (2024).

    2024 DOI Publication link

    Light Sources, optical resonators and antennas, plasmonics, quantum optics, Advanced Finite Element Methods, Light Scattering Computation, Resonance Mode Computation

  7. Imaging Mueller matrix ellipsometry measurements on measuring fields in the micrometre range

    An imaging Mueller matrix ellipsometer is used to measure nanoscale line and grating structures in micron-sized measurement fields. To reconstruct the structural parameters from the ellipsometric data, numerical simulations using the finite element method were performed. The commercial FEM Maxwell solver JCMwsuite was employed to solve the inverse diffraction problem and to fit the measured Mueller matrix images by varying the simulation parameters in an optimization process.

    J. Grundmann, et al. Imaging Mueller matrix ellipsometry measurements on measuring fields in the micrometre range. EPJ Web of Conferences 309, 02010 (2024).

    2024 DOI Publication link

    Optical Metrology and Sensing, Optical and EUV Lithography, Advanced Finite Element Methods, Optimization and Parameter Retrieval Methods

  8. Crossing of the Branch Cut: The Topological Origin of a Universal 2Pi-Phase Retardation in Non-Hermitian Metasurfaces

    Poles and zeros are computed with JCMsuite to generate a basic understanding of how to engineer electromagnetic fields at material interface e.g. metasurfaces. This knowledge can be used to generate full wavefront control of optical components which require spatial phase modulation of incoming beams with a phase from 0 to 2 pi.

    R. Colom, et al. Crossing of the Branch Cut: The Topological Origin of a Universal 2𝝅-Phase Retardation in Non-Hermitian Metasurfaces. Laser & Photonics Reviews, 17, 2200976 (2023).

    2023 DOI Publication link

    Metamaterials, integrated optics, Advanced Finite Element Methods, Light Scattering Computation

  9. Forward simulation of coherent beams on grating structures for coherent scatterometry

    A coherent illumination model for scattering of focused beams such as Gaussian- and Bessel beams by periodic structures such as line gratings is presented. The model is then compared with strategies implemented on large-scale super-cells and inverse Floquet-transform strategies to superimpose both near- and far fields coherently.

    M. Hammerschmidt, et al. Forward simulation of coherent beams on grating structures for coherent scatterometry. Proc. SPIE PC12619, PC1261907 (2023).

    2023 DOI Publication link

    diffractive optics, Advanced Finite Element Methods, Light Scattering Computation

  10. Resonant Plasmonic–Biomolecular Chiral Interactions in the Far-Ultraviolet Films

    The work considers enhanced chiral sensing of a resonant plasmonic-biomolecular system, that operates in the far-UV. The analyzed structures are gammadions with biomolecular ultrathin amino acid films with bi-anisotropic material. The simulated circular dichroism using JCMsuite is in good agreement with experiment data.

    T. R. Leite, et al. Resonant Plasmonic–Biomolecular Chiral Interactions in the Far-Ultraviolet: Enantiomeric Discrimination of sub-10 nm Amino Acid Films. Nano Lett. 22, 7343 (2022).

    2022 DOI Publication link

    integrated optics, optical chirality, Advanced Finite Element Methods, Light Scattering Computation

  11. Eigenfrequency sensitivities using Riesz projections for efficient optimization of nanophotonic resonators

    The Riesz projection method allows to efficiently compute the eigenfrequency sensitivities of resonance problems. These are then used to optimize a nano resonator in terms of Q-factor, where the required scattering solutions are computed with the FEM method of JCMsuite.

    F. Binkowski, et al. Computation of eigenfrequency sensitivities using Riesz projections for efficient optimization of nanophotonic resonators. Commun. Phys. 5, 202 (2022).

    2022 DOI Publication link

    optical resonators and antennas, Advanced Finite Element Methods, Optimization and Parameter Retrieval Methods, Resonance Mode Computation

  12. Long- and short-ranged chiral interactions in DNA-assembled plasmonic chains

    Using DNA origami, plasmonic nano spheres and nanorods are aligned into a chiral structure whose CD signal was measured. The measurements are in good agreement with numerical simulations of JCMsuite using curvilinear higher order finite elements to resolve the complex plasmonic behavior.

    K. Martens, et al. Long- and short-ranged chiral interactions in DNA-assembled plasmonic chains. Nat. Commun., 12, 2025 (2021).

    2021 DOI Publication link

    Optical Metrology and Sensing, optical chirality, optical resonators and antennas, plasmonics, Advanced Finite Element Methods, Light Scattering Computation

  13. Finite element method for 3D optical modeling of liquid crystal on silicon spatial light modulator

    Traditional matrix methods cannot accurately predict the optical performance of liquid crystal (LC) on silicon spatial light modulators if the LC distribution is complex. Employing JCmsuite, an improved finite-element method is developed by combining the scattering matrix method with the domain decomposition method.

    P. J. Chen, et al. Finite element method for 3D optical modeling of liquid crystal on silicon spatial light modulator. Emerging Liquid Crystal Technologies XV, 113, 1130308 (2020).

    2020 DOI Publication link

    integrated optics, Advanced Finite Element Methods, Light Scattering Computation

  14. Grazing incidence x-ray fluorescence based profile reconstruction

    Rigorous field simulations obtained from a Maxwell solver (JCMsuite) in combination with Bayesian optimization allow to determine the spatial distribution of elemental species and the geometrical shape with sub-nm resolution.

    A. Andrle, et al. Grazing incidence x-ray fluorescence based characterization of nanostructures for element sensitive profile reconstruction. Proc. SPIE 11057, 110570M (2019).

    2019 DOI

    Optical Metrology and Sensing, Optical and EUV Lithography, Advanced Finite Element Methods, Optimization and Parameter Retrieval Methods

  15. Enhanced the photon-extraction efficiency of quantum dots by using microlenses

    Deterministically fabricated microlenses are used to realized high extraction efficiency from single quantum dots. FEM simulations allow for device design.

    A. Kaganskiy, et al. Enhancing the photon-extraction efficiency of site-controlled quantum dots by deterministically fabricated microlenses, Opt. Commun. 413, 162 (2018).

    2018 DOI

    Light Sources, other fields, quantum optics, Advanced Finite Element Methods, Light Scattering Computation

  16. Numerical optimization of the extraction efficiency of a quantum-dot based single-photon emitter into a single-mode fiber

    The publication introduces a finite-element method for the accurate and efficient simulation of strongly localized light sources, such as quantum dots, embedded in dielectric micro-optical structures. The method is applied in order to optimize the photon extraction efficiency of a single-photon emitter and to study the robustness of the extraction efficiency with respect to fabrication errors and defects.

    P.-I. Schneider, et al. Numerical optimization of the extraction efficiency of a quantum-dot based single-photon emitter into a single-mode fiber. Opt. Express 26, 8479 (2018).

    2018 DOI Publication link

    Light Sources, quantum optics, Advanced Finite Element Methods

  17. Evaluating the effects of modeling errors for isolated finite three-dimensional targets

    Optical three-dimensional (3-D) nanostructure metrology utilizes a model-based metrology approach to determine critical dimensions (CDs) that are well below the inspection wavelength. A project at the National Institute of Standards and Technology is evaluating how to attain key CD and shape parameters from engineered in-die capable metrology targets. The performance of simplified models is validated using highly accurate, fully 3D simulations.

    M. A. Henn, et al. Evaluating the effects of modeling errors for isolated finite three-dimensional targets. J. of Micro/Nanolithography, MEMS, and MOEMS, 16, 044001 (2017).

    2017 DOI

    Optical Metrology and Sensing, Optical and EUV Lithography, Advanced Finite Element Methods, Optimization and Parameter Retrieval Methods

  18. Efficient single-photon source based on a deterministically fabricated single quantum dot microstructure with backside gold mirror

    An efficient broadband single-photon source is presented. The optical design was optimized using JCMsuite.

    S. Fischbach, et al. Efficient single-photon source based on a deterministically fabricated single quantum dot - microstructure with backside gold mirror. Appl. Phys. Lett. 111, 011106 (2017).

    2017 DOI Publication link

    Light Sources, quantum optics, Advanced Finite Element Methods

  19. Investigating surface structures by EUV scattering

    An exploration of soft X-ray and EUV-scatterometry from grazing to near normal incidence is presented. Measurements are performed on e-beam written silicon gratings. The reconstructed geometrical line shape models are statistically validated by applying a Markov-Chain Monte Carlo sampling technique. Experimental data and simulation results provide insight into the potential of EUV scatterometry.

    V. Soltwisch, et al. Investigating surface structures by EUV scattering. Proc. SPIE 10143, 101430P (2017).

    2017 DOI

    Optical Metrology and Sensing, Optical and EUV Lithography, Advanced Finite Element Methods, Optimization and Parameter Retrieval Methods, Uncertainty Quantification Methods