Multi-dimensional band structure spectroscopy in the photonic synthetic frequency dimension

https://phys.org/news/2023-07-multi-dimensional-band-spectroscopy-photonic-synthetic.html

"resonator dynamic modulation using multiple modulation frequencies, a multi-dimensional lattice in the synthetic frequency dimension was created with this single resonator... by tuning relative phases between different modulation frequencies resolve lattice band ove entire multi-dimensional Brillouin zone... measured 2D band structure non-Hermitian skin effect, eigenvalue sexponentially located on boundaries... multi-dimensional band structure spectroscopy exploring high-dimensional systems"

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