Observed enhanced emission at higher-order exceptional points in RF circuits
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866908696967118848 |
|---|---|
| author | Wyszkowski, Nicolas Suntharalingam, Arunn Vitek, Max Kurnosov, Arkady Fernández-Alcázar, Lucas J. Kottos, Tsampikos |
| author_facet | Wyszkowski, Nicolas Suntharalingam, Arunn Vitek, Max Kurnosov, Arkady Fernández-Alcázar, Lucas J. Kottos, Tsampikos |
| contents | The Purcell effect -- stemming directly from the celebrated Fermi's Golden Rule -- links the enhanced emissivity of an emitter to the local density of states (LDoS) of a surrounding cavity. Under typical circumstances the LDoS is assumed to have a Lorentzian lineshape. Here, we go beyond the traditional Purcell framework by designing RF cavities with non-Lorentzian LDoS caused by higher-order non-Hermitian exceptional point degeneracies (EPDs) where $N\geq 2$ eigenfrequencies and their associated eigenmodes coalesce. We experimentally demonstrate a non-conventional emissivity enhancement (as compared to the isolated resonance regime) that increases with the EPD order $N$. The theoretical analysis traces its origin to an $N$-th power Lorentzian LDoS line shape that dominates under judicious spatially designed cavity losses. Our results reveal a new route to design cavities that do not rely on ultrahigh $Q$-factor resonators or small modal volumes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_06544 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observed enhanced emission at higher-order exceptional points in RF circuits Wyszkowski, Nicolas Suntharalingam, Arunn Vitek, Max Kurnosov, Arkady Fernández-Alcázar, Lucas J. Kottos, Tsampikos Optics Applied Physics The Purcell effect -- stemming directly from the celebrated Fermi's Golden Rule -- links the enhanced emissivity of an emitter to the local density of states (LDoS) of a surrounding cavity. Under typical circumstances the LDoS is assumed to have a Lorentzian lineshape. Here, we go beyond the traditional Purcell framework by designing RF cavities with non-Lorentzian LDoS caused by higher-order non-Hermitian exceptional point degeneracies (EPDs) where $N\geq 2$ eigenfrequencies and their associated eigenmodes coalesce. We experimentally demonstrate a non-conventional emissivity enhancement (as compared to the isolated resonance regime) that increases with the EPD order $N$. The theoretical analysis traces its origin to an $N$-th power Lorentzian LDoS line shape that dominates under judicious spatially designed cavity losses. Our results reveal a new route to design cavities that do not rely on ultrahigh $Q$-factor resonators or small modal volumes. |
| title | Observed enhanced emission at higher-order exceptional points in RF circuits |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2512.06544 |