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Modelling Photonic Crystal Surface Emitting Lasers (PCSELs) with Iterative Weighted Index Method (2023)
Conference Proceeding
Lang, B., Vukovic, A., Sewell, P., Rihani, S., Boylan, K., Berry, G., …Rawsthorne, J. (2023). Modelling Photonic Crystal Surface Emitting Lasers (PCSELs) with Iterative Weighted Index Method. In 2023 International Conference on Electromagnetics in Advanced Applications (ICEAA) (485 - 485). https://doi.org/10.1109/ICEAA57318.2023.10297919

Photonic crystal surface emitting lasers (PCSELs) are a promising type of semiconductor laser, able to maintain single-mode operation over a large area, resulting in a high-power beam with small angular divergence.

Transmission Line Modelling of an Eccentrically Loaded probe Coupled Cylindrical Cavity (2022)
Conference Proceeding
Jokovic, J., Dimitrijevic, T., Atanaskovic, A., Doncov, N., Altinozen, E., Vukovic, A., & Sewell, P. (2022). Transmission Line Modelling of an Eccentrically Loaded probe Coupled Cylindrical Cavity. In 2022 XIV International Symposium on Industrial Electronics and Applications (INDEL 2022) (37-40). https://doi.org/10.1109/INDEL55690.2022.9965465

In this paper, numerical Transmission Line-Matrix (TLM) method is applied to model an eccentrically loaded cylindrical cavity in order to analyze an impact of the eccentricity on the resonant frequency values. Two different types of meshes are consid... Read More about Transmission Line Modelling of an Eccentrically Loaded probe Coupled Cylindrical Cavity.

Two-dimensional TE Series Node Transmission-Line Modelling Based on Unstructured Triangular Meshes (2022)
Conference Proceeding
Yan, K., Vukovic, A., & Sewell, P. (2022). Two-dimensional TE Series Node Transmission-Line Modelling Based on Unstructured Triangular Meshes. In 2022 52nd European Microwave Conference (EuMC 2022) (448-451). https://doi.org/10.23919/eumc54642.2022.9924316

The transmission-line modelling (TLM) method has been widely applied to many areas of electromagnetic simulations. This paper presents the development of the series TE model for the TLM method based on triangular meshes. The 2D series unstructured TL... Read More about Two-dimensional TE Series Node Transmission-Line Modelling Based on Unstructured Triangular Meshes.

PML Effectiveness in the Transmission Line Modelling Method for Radiation and Scattering Applications (2020)
Conference Proceeding
Odeyemi, J., Smartt, C., Vukovic, A., M.Benson, T., M. Benson, T., & Sewell, P. (2020). PML Effectiveness in the Transmission Line Modelling Method for Radiation and Scattering Applications. . https://doi.org/10.23919/EuCAP48036.2020.9135802

This paper demonstrates the effectiveness of the recently introduced, stable, perfectly matched layer (PML) for the Transmission Line Modelling (TLM) method. The superiority of the new PML over the TLM matched boundary is demonstrated by application... Read More about PML Effectiveness in the Transmission Line Modelling Method for Radiation and Scattering Applications.

An Improved PML Implementation In The Transmission Line Method (2019)
Conference Proceeding
Odeyemi, J., Vukovic, A., Benson, T., & Sewell, P. (2019). An Improved PML Implementation In The Transmission Line Method. In Tenth International Conference on Computational Electromagnetics (CEM 2019). https://doi.org/10.1049/cp.2019.0124

A new framework for the development of the perfectly matched layer (PML) in the Transmission Line Modelling (TLM) method is demonstrated. The formulation is based on the stretched coordinate PML and involves the mapping of the TLM node to an analytic... Read More about An Improved PML Implementation In The Transmission Line Method.

Parity-time symmetric chain resonators (2016)
Conference Proceeding
Phang, S., Vukovic, A., Creagh, S., Gradoni, G., Sewell, P., & Benson, T. M. (2016). Parity-time symmetric chain resonators.

A simple tight-binding model to study the band-structure of an infinite length Parity-time (PT) symmetric chain of resonators is presented in this paper. In the talk, we will investigate the impact of having a structure of finite length and consider... Read More about Parity-time symmetric chain resonators.

Threshold manipulation in parity-time symmetric microresonator chain (2015)
Conference Proceeding
Phang, S., Vukovic, A., Creagh, S., Benson, T. M., Gradoni, G., & Sewell, P. D. (2015). Threshold manipulation in parity-time symmetric microresonator chain.

This paper analyses the eigenfrequencies of an infinitely long chain of microresonators with PT symmetry. The results show that the depth of modulation of the real part of the refractive index can be used to control the threshold point of the PT stru... Read More about Threshold manipulation in parity-time symmetric microresonator chain.

Parity-time chain of whispering-gallery mode resonators (2015)
Conference Proceeding
Phang, S., Vukovic, A., Creagh, S., Benson, T. M., Gradoni, G., & Sewell, P. D. (2015). Parity-time chain of whispering-gallery mode resonators.

The paper analyses the dispersion characteristics of an infinitely long PT chain made of whispering gallery resonators with gain/loss modulation. The results show that the appearance of the threshold breaking point depends not only on both of couplin... Read More about Parity-time chain of whispering-gallery mode resonators.

Practical limitation on operation of nonlinear parity-time Bragg gratings (2014)
Conference Proceeding
Phang, S., Vukovic, A., Susanto, H., Benson, T. M., & Sewell, P. (2014). Practical limitation on operation of nonlinear parity-time Bragg gratings.

The paper analyses the operation of PT Bragg gratings when the dielectric material is considered to be both dispersive and nonlinear and gain and loss are saturable. The paper demonstrates the application of the nonlinear PT Bragg Grating as an optic... Read More about Practical limitation on operation of nonlinear parity-time Bragg gratings.

Saturable and dispersive parity-time symmetric directional coupler: a transmission-line modelling study (2014)
Conference Proceeding
Phang, S., Vukovic, A., Benson, T. M., Creagh, S., Sewell, P., & Gradoni, G. (2014). Saturable and dispersive parity-time symmetric directional coupler: a transmission-line modelling study.

In this paper, numerical modelling of Parity-Time (PT) coupled waveguides is reported. The PT coupled waveguide structure consists of two coupled slab waveguides based on GaAs material with gain/loss material parameter models, including both dispersi... Read More about Saturable and dispersive parity-time symmetric directional coupler: a transmission-line modelling study.

Modelling of dispersive PT-symmetric Bragg grating (2014)
Conference Proceeding
Phang, S., Vukovic, A., Susanto, H., Benson, T. M., & Sewell, P. (2014). Modelling of dispersive PT-symmetric Bragg grating.

This paper reports on the time-domain numerical model of a parity-time Bragg grating with saturated and dispersive gain. The model is compared against the ideal PT scenario where the gain is constant and unsaturated for all frequencies.

Coupled parity-time symmetric cavities: results from transmission line modelling simulations
Conference Proceeding
Phang, S., Vukovic, A., Creagh, S., Sewell, P. D., Gradoni, G., & Benson, T. M. (2015). Coupled parity-time symmetric cavities: results from transmission line modelling simulations.

This paper studies the impact of a dispersive gain/loss material model on Parity-Time (PT) coupled microresonator cavity structures using the time-domain Transmission-Line Modelling method. A modal analysis is also performed to compare the modal comp... Read More about Coupled parity-time symmetric cavities: results from transmission line modelling simulations.

Threshold preservation of PT-resonant structures in realistic-dispersive medium
Conference Proceeding
Phang, S., Vukovic, A., Creagh, S. C., Benson, T. M., Sewell, P., & Gradoni, G. Threshold preservation of PT-resonant structures in realistic-dispersive medium.

The impact of material dispersion in the performance of parity-time (PT) symmetric coupled microresonators is studied. The eigenfrequencies of the coupled PT-system are analysed for different dispersion parameter. We show that realistic dispersion pr... Read More about Threshold preservation of PT-resonant structures in realistic-dispersive medium.

Parity-Time coupled microresonators: Kramers-Kronig limitation
Conference Proceeding
Phang, S., Vukovic, A., Creagh, S. C., Sewell, P., Gradoni, G., & Benson, T. M. Parity-Time coupled microresonators: Kramers-Kronig limitation.

In this talk, we use a KKE argument to show that the presence of dispersion alters the eigen-frequencies of coupled PT coupled microresonators, so that their eigen-frequencies are no longer complex conjugates after the EP.