Abstract
Adding active components to a photonic device may dramatically enrich and improve its performance but, at the same time, creates the risk of instability, namely, occurrence of unwanted self-oscillations. Stability considerations are not always given the attention they deserve when setups employing gain media are investigated; thus, the desired effects or reported regimes may not be achievable. In this work, a generic electromagnetic configuration comprising a pair of planar impedance metasurfaces is examined and analytical stability conditions for its operation are derived. The obtained results for the analyzed basic module can shed light on the stability conditions of more complex active systems that incorporate such components and serve a broad range of applications from imaging and polarization engineering to invisibility cloaking and wavefront transformations.
| Original language | English |
|---|---|
| Article number | 113045 |
| Number of pages | 15 |
| Journal | New Journal of Physics |
| Volume | 23 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2021 |
| MoE publication type | A1 Journal article-refereed |
Funding
Both authors are grateful to Professor Silvio Hrabar (University of Zagreb, Croatia) for discussions of stability of systems containing transmission lines. The corresponding author (CV) would like also to thank Professor Francesco Monticone (Cornell University, NY, USA) for useful discussions on the stability of planar photonic structures. This work was partially supported by Nazarbayev University Faculty Development Competitive Research Grant No. 021220FD4051 entitled: 'Optimal design of photonic and quantum metamaterials'.
Keywords
- stability
- metasurface
- active media
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