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  1. A fiber-pigtailed quantum dot device generating indistinguishable photons at GHz clock-rates

    A Purcell-enhanced quantum dot single-photon source based on a hybrid circular Bragg grating (hCBG) microcavity was permanently attached to a single-mode fiber. The optical performance of the fiber-coupled hCBG cavity geometry was analyzed using JCMsuite. Finite Element Method (FEM) simulations with the software were essential to understand and predict the Purcell factor and single-photon fiber-coupling efficiency as functions of the fiber-to-cavity distance and lateral alignment.

    L. Rickert, et al. A fiber-pigtailed quantum dot device generating indistinguishable photons at GHz clock-rates. Nanophotonics 14, 1795 (2025).

    2025 DOI Publication link

    Light Sources, optical resonators and antennas, quantum optics, Light Scattering Computation

  2. Dark Lines and Polarization Singularities in Bright Metasurface-Enhanced Fluorescence

    The work investigates surprising dark lines and polarization singularities in momentum-space fluorescence patterns from plasmonic nanoantenna lattices. These features arise from destructive far-field interference between diffractively outcoupled TE and TM waveguide modes. JCMsuite's finite element method solver was used to efficiently compute the T-matrix of individual plasmonic scatterers, which was then integrated into a lattice reciprocity model to simulate and validate the complex angle- and polarization-resolved emission patterns.

    D. Pal, A. F. Koenderink. Dark Lines and Polarization Singularities in Bright Metasurface-Enhanced Fluorescence. Laser Photonics Rev., e02199 (2025).

    2025 DOI Publication link

    Light Sources, Metamaterials, optical resonators and antennas, photonic crystals, Light Scattering Computation

  3. Efficient computation of thermal radiation from biperiodic layered systems using the T‑matrix method

    This work presents a T‑matrix‑based method for efficiently computing angle‑ and polarization‑resolved thermal emission from metasurfaces. The T‑matrices of individual meta‑atoms were computed using JCMsuite’s finite‑element solver, providing accurate reference data for the scattering response. These pre‑computed T‑matrices were then employed in the treams library to rapidly evaluate thermal emissivity for many lattice configurations, radiation directions, and polarizations, demonstrating a significant speed‑up compared to conventional RCWA or full FEM approaches.

    M. Gabbert, et al. Efficient computation of thermal radiation from biperiodic layered systems using the T‑matrix method. arXiv:2508.11590 (2025).

    2025 DOI Publication link

    Light Sources, Metamaterials, optical chirality, Advanced Finite Element Methods, Light Scattering Computation

  4. Exceptional Points and Lasing Thresholds: When Lower-Q Modes Win

    This work challenges the conventional rule that the highest‑Q mode always reaches the lasing threshold first under uniform gain. By studying non‑Hermitian degeneracies (exceptional points) in laser cavities, the authors show that lower‑quality‑factor modes can coalesce and accelerate toward threshold, surpassing initially more favorable modes. JCMsuite’s finite‑element solver was used to compute the quasi‑normal modes of a designed polygonal microcavity and to trace their complex‑frequency trajectories as gain is increased, thereby validating the predicted exceptional‑point‑induced mode switching.

    J. Kullig, et al. Exceptional Points and Lasing Thresholds: When Lower-Q Modes Win. Phys. Rev. Lett. 135, 173802 (2025).

    2025 DOI Publication link

    Light Sources, optical resonators and antennas, Light Scattering Computation, Resonance Mode Computation

  5. High Purcell enhancement in all-TMDC nanobeam resonators

    The authors propose an all-transition-metal-dichalcogenide (TMDC) nanobeam resonator with an active monolayer, designed to function as a high-β-factor nanolaser. A theoretical and computational framework for modeling and optimizing the Purcell enhancement was developed, based on a resonance expansion to resolve sharp spectral peaks from high-Q resonances. JCMsuite was used to perform the finite element method simulations of the 3D resonator and its resonance modes, and its Bayesian optimization tool was employed to maximize the Purcell enhancement under a Q-factor constraint.

    F. Binkowski, et al. High Purcell enhancement in all-TMDC nanobeam resonator designs with active monolayers for nanolasers. Phys. Rev. B 112, 235410 (2025).

    2025 DOI Publication link

    Light Sources, optical resonators and antennas, photonic crystals, Optimization and Parameter Retrieval Methods, Resonance Mode Computation

  6. Numerical study of high-temperature, disk-based tungsten and molybdenum thermophotovoltaic selective thermal emitters

    This work investigates the design of two-dimensional selective thermal emitters (STEs) made of tungsten or molybdenum disks with a hafnia spacer for thermophotovoltaic applications. A parametric analysis was performed to study the effect of geometry on the thermal emittance and to identify designs optimized for use with a GaSb photovoltaic cell. The spectral and angular emittance of the STEs, as well as the electromagnetic field distributions to identify resonant modes, were computed using the finite element method (FEM) in JCMsuite.

    G. Silva-Oelker, et al. Numerical study of high-temperature, disk-based tungsten and molybdenum thermophotovoltaic selective thermal emitters. Opt. Express, 33, 6953 (2025).

    2025 DOI Publication link

    Light Sources, Photovoltaics, Light Scattering Computation, Resonance Mode Computation

  7. Storage of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory with on-demand retrieval

    This work demonstrates the on-demand storage and retrieval of single photons from an InGaAs quantum dot (QD) in a cesium vapor memory. A key challenge was optimizing the interface between the solid-state single-photon source and the atomic system. The team used JCMsuite's finite element method to numerically design and optimize a hybrid circular Bragg grating cavity, which enhanced the QD's photon extraction efficiency and far-field profile for efficient coupling to the memory.

    B. Maaß, et al. Storage of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory with on-demand retrieval. Quantum Sci. Technol. 10, 035058 (2025).

    2025 DOI Publication link

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

  8. Bright Electrically Contacted Circular Bragg Grating Resonators with Deterministically Integrated Quantum Dots

    This work presents the design and implementation of electrically contacted circular Bragg grating (CBG) resonators for cavity-enhanced quantum dot (QD) single-photon sources. The authors used the finite-element solver JCMsuite for full three-dimensional numerical simulations to model and optimize the photon extraction efficiency (PEE) of their novel ridge-based CBG designs. Furthermore, a Bayesian optimization algorithm within the JCMsuite framework was employed to determine the optimal device geometry parameters, such as ring widths, mesa radius, and ridge width, to maximize optical performance.

    S. Wijitpatima, et al. Bright Electrically Contacted Circular Bragg Grating Resonators with Deterministically Integrated Quantum Dots. ACS Nano, 18, 31834 (2024).

    2024 DOI Publication link

    Light Sources, optical resonators and antennas, quantum optics, Advanced Finite Element Methods, Light Scattering Computation, Optimization and Parameter Retrieval Methods

  9. Self-Aligned Photonic Defect Microcavity Lasers with Site-Controlled Quantum Dots

    Researchers presented a novel, self-aligned method to fabricate strain-induced site-controlled microcavities (SCMs) and quantum dots (QDs), eliminating the need for any post-growth lithography. To investigate the optical properties of these microcavities, 3D electromagnetic simulations were performed using JCMsuite. These simulations were crucial for modeling the complex cavity geometry, calculating the fundamental optical mode, and extracting key parameters such as the theoretical Q-factor and mode volume.

    C.-W. Shih, et al. Self-Aligned Photonic Defect Microcavity Lasers with Site-Controlled Quantum Dots. Laser Photonics Rev. 18, 2301242 (2024).

    2024 DOI Publication link

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

  10. Advances in Quantum Metrology with Dielectrically Structured Single Photon Sources Based on Molecules

    The authors present a new generation of molecule-based single-photon sources for quantum radiometry, integrating anthracene nanocrystals doped with dibenzoterrylene molecules into a polymeric microlens structure on a gold mirror. Finite element simulations with JCMsuite were performed to model the emission pattern and estimate the collection efficiency enhancement provided by the integrated microlens. The simulations predicted a factor of three enhancement in collection efficiency, guiding the device design and supporting the experimental observations.

    P. Lombardi, et al. Advances in Quantum Metrology with Dielectrically Structured Single Photon Sources Based on Molecules. Adv. Quantum Technol., 7, 2400107 (2024).

    2024 DOI Publication link

    Light Sources, Optical Metrology and Sensing, optical resonators and antennas, quantum optics, Light Scattering Computation

  11. High-quality single InGaAs/GaAs quantum dot growth on a silicon substrate for quantum photonic applications

    The authors demonstrate the direct epitaxial growth of high-quality InGaAs/GaAs quantum dots on a silicon substrate using a GaP buffer layer. The quantum dots exhibit excellent single-photon emission properties, including high photon extraction efficiency. Finite-element method simulations performed with JCMsuite were used to compute and verify the expected photon extraction efficiency of the planar sample design with a distributed Bragg reflector backside mirror.

    I. Limame, et al. High-quality single InGaAs/GaAs quantum dot growth on a silicon substrate for quantum photonic applications. Optica Quantum, Vol. 2, 117 (2024).

    2024 DOI Publication link

    Light Sources, quantum optics, Light Scattering Computation

  12. Microresonator-enhanced quantum dot single-photon emission in GaAs-on-insulator platform

    This work demonstrates a high-brightness quantum dot single-photon source integrated into a GaAs-on-insulator microring resonator. The authors performed finite element simulations using JCMsuite to calculate the theoretical quality factor of the microring cavity, which was a key parameter for estimating the Purcell enhancement and coupling efficiency of the quantum dot to the resonator modes. These simulations were essential for designing the photonic structure to optimize light-matter interaction.

    Y. Zhou, et al. Microresonator-enhanced quantum dot single-photon emission in GaAs-on-insulator platform. Mater. Quantum. Technol. 4, 045401 (2024).

    2024 DOI Publication link

    Light Sources, optical resonators and antennas, quantum optics, Light Scattering Computation

  13. Numerical Investigation of a Coupled Micropillar – Waveguide System for Integrated Quantum Photonic Circuits

    This work presents the numerical design and optimization of a monolithic, on-chip single-photon source. The source consists of a whispering-gallery-mode micropillar laser evanescently coupled to a ridge waveguide containing a single quantum dot. The FEM solver JCMsuite was used to perform eigenmode and scattering simulations to optimize the device geometry, analyzing the impact of parameters like the pillar-waveguide gap distance and waveguide width on the coupling efficiency and resonator quality factor.

    L. J. Roche, et al. Numerical Investigation of a Coupled Micropillar – Waveguide System for Integrated Quantum Photonic Circuits. Adv. Quantum Technol., 7, 2400195 (2024).

    2024 DOI Publication link

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

  14. 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

  15. 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

  16. Comprehensive assessment of terahertz quantum-cascade lasers performance characteristics

    The authors present a comprehensive method to characterize the electrical, optical, and thermal performance of terahertz quantum-cascade lasers (THz QCLs). To analyze the laser waveguides and decouple the influence of different resonator parameters, the optical waveguide losses were calculated using JCMsuite's finite element method solver. The simulation of a two-dimensional waveguide cross-section was essential for determining the intrinsic waveguide loss and effective refractive index, which were used to separate the contributions of transparency current and various optical losses to the laser threshold.

    V. Pistore, et al. Comprehensive assessment of terahertz quantum-cascade lasers performance characteristics. J. Appl. Phys. 136, 194506 (2024).

    2024 DOI Publication link

    Light Sources, optical resonators and antennas, Light Scattering Computation, Propagation Mode Computation

  17. Applying a Riesz-projection-based contour integral eigenvalue solver to compute resonance modes of a VCSEL

    Resonance modes of a VCESEL are computed with a contour integral method that uses physical right-hand sides, the so-called Riesz projection eigenvalue solver. A study of the numerical parameters of the integration contour and different physical sources is presented, where scattering simulations are performed with JCMsuite.

    L. Kuen, Applying a Riesz-projection-based contour integral eigenvalue solver to compute resonance modes of a VCSEL. Proc. SPIE 12575, Integrated Optics: Design, Devices, Systems and Applications VII, 125750J (31 May 2023).

    2023 DOI Publication link

    Light Sources, optical resonators and antennas, Resonance Mode Computation

  18. Correlated Disorder Substrate-Integrated Nanodisk Scatterers for Light Extraction in Organic Light Emitting Diodes

    The waveguide mode loss of the layer stack in an OLED is investigated via numerical analysis with JCMsuite. To improve this type of loss, an OLED with nanodisk scatterers integrated into the substrate is presented, numerically investigated, and discussed.

    P. M. Piechulla, et al., Correlated Disorder Substrate-Integrated Nanodisk Scatterers for Light Extraction in Organic Light Emitting Diodes. Advanced Optical Materials, 11, 2202557 (2023).

    2023 DOI Publication link

    Light Sources, optical resonators and antennas, Light Scattering Computation, Resonance Mode Computation

  19. Resonance Expansion of Quadratic Quantities with Regularized Quasinormal Modes

    In this paper, the resonance expansion of quadratic quantities is resented and applied to a circular Bragg grating resonator. Therefore the Riesz Projection method is applied and the electromagnetic field is described via quasinormal modes, the fields and quantities are computed with JCMsuite.

    F. Betz, et al. Resonance Expansion of Quadratic Quantities with Regularized Quasinormal Modes. Physica status solidi (a), 220, 2200892 (2023).

    2023 DOI Publication link

    Light Sources, optical resonators and antennas, Resonance Mode Computation, other methods