Krishna, LAS and Deka, J and Biswas, R and Raghunathan, V (2023) Plane-wave Expansion based Modelling of Linear and Non-Linear Response of Resonant Metasurfaces under Realistic Excitation Conditions. In: Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, 26 - 30 June 2023, Munich.
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Abstract
It is generally easy to model resonance characteristics of infinitely periodic resonant metasurfaces under plane-wave excitation. However, extending this to finite size arrays and more realistic Gaussian-like excitation beams becomes complex and time-consuming. Extending the linear optical resonances to model the nonlinear optical performance also becomes cumbersome. The use of non-standard, off-axis excitation, for example using reflective objective with central obscuration are also difficult to model with existing simulation tools. Here, we report a unified approach to modelling linear and nonlinear optical characteristics of resonant metasurfaces using a plane wave expansion (PWE) method to realize gaussian excitation with any arbitrary excitation angular profile. As an example, we compare the PWE model with experimental results of linear and third-order sum-frequency generation (TSFG) from 1D gratings with double step profile supporting q-BIC resonances, which we have previously reported experimentally 1. © 2023 IEEE.
| Item Type: | Conference Proceedings |
|---|---|
| Publication: | 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023 |
| Publisher: | Institute of Electrical and Electronics Engineers Inc. |
| Additional Information: | The copyright for this article belongs to Author. |
| Keywords: | Elastic waves; Gaussian beams; Quantum optics; Wave propagation, Based modelling; Excitation conditions; Finite size; Gaussians; Linear optical; Metasurface; Non-linear response; Plane wave excitation; Plane-wave expansions; Resonance characteristic, Nonlinear optics |
| Department/Centre: | Division of Electrical Sciences > Electrical Communication Engineering |
| Date Deposited: | 04 Mar 2024 09:31 |
| Last Modified: | 04 Mar 2024 09:31 |
| URI: | https://eprints.iisc.ac.in/id/eprint/84365 |
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