Cavity-enhanced second harmonic generation from Rydberg excitons in Cu₂O

@misc{wong2026cavityenhanced,
  title = {{Cavity-enhanced second harmonic generation from Rydberg excitons in Cu$_2$O}},
  author = {Horatio Q. X Wong and Krzysztof Sawicki and Madeleine Fisher and Stephen A. Lynch and Wolfgang Langbein and Sai Kiran Rajendran and Hamid Ohadi and Matthew P. A. Jones and Liam A. P. Gallagher},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.09705},
  eprint = {2611.09705},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.09705},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Cavity-enhanced second harmonic generation from Rydberg excitons in Cu_2O
AU  - Horatio Q. X Wong
AU  - Krzysztof Sawicki
AU  - Madeleine Fisher
AU  - Stephen A. Lynch
AU  - Wolfgang Langbein
AU  - Sai Kiran Rajendran
AU  - Hamid Ohadi
AU  - Matthew P. A. Jones
AU  - Liam A. P. Gallagher
PY  - 2026
DA  - 2026/11/06
PB  - arXiv
DO  - 10.48550/arxiv.2611.09705
UR  - https://arxiv.org/abs/2611.09705
AB  - Rydberg excitons in Cu_2O provide a solid-state setting for creating giant optical nonlinearities. Here, we use second-harmonic generation (SHG) to study Rydberg excitons in a doubly resonant optical microcavity designed to enhance both the pump and second-harmonic fields. We observe even-parity exciton states in an optical cavity and extend cavity-based measurements of Rydberg excitons up to n=10. The SHG intensity depends strongly on pump cavity detuning, showing the dominant role of the microcavity is the enhancement of the intra-cavity pump field. Analysis reveals an additional enhancement from the resonant second-harmonic cavity giving an overall SHG enhancement factor of 21 ± 2 inside the microcavity. These results establish cavity-enhanced SHG spectroscopy as a valuable tool for studying Rydberg excitons in microcavities and provide a pathway towards exploiting optical nonlinearities in Rydberg exciton polariton systems.
ER  -