The dynamic resonator ring offers a new opportunity in the synthetic frequency dimension

The dynamic resonator ring offers a new opportunity in the synthetic frequency dimension

Synthetic grating along the frequency axis of light in two connected fibrous rings of different lengths. Credit: Guangzhe Li, Shanghai Jiao Tong University

Synthetic dimensions in photonics offer exciting new ways to manipulate light, to study physical phenomena with exotic connections, and to study physics with higher dimensions. Dynamically modulated ring resonator systems, in which the resonant modes are connected to construct a synthetic frequency dimension, can provide great experimental flexibility and reconfiguration.

The construction of complex synthetic gratings, such as Lieb gratings and honeycomb gratings in multiple rings, will lead to rich opportunities for the study of exotic physical phenomena which currently exist only in the theoretical field, such as the phase transition of parity and time in non-Hermitian systems and topologies of higher order. Towards experimental construction of more complex multi-ring lattices, creating synthetic ones frequency space systems in two rings of different lengths is an important step.

As reported in Advanced photonics, a team of researchers from Shanghai Jiao Tong University recently constructed a synthetic grid along the frequency dimension. They used two connected rings of different lengths, while the larger ring underwent dynamic modulation. Their study, which was the first such experimental demonstration, observed and verified the inherent physical properties of such gratings, especially the natural existence of the flat (dispersion-free) strip. They also observed the localization regime near the flat band. Such flat strips in the synthetic space can be further modified by introducing long-distance connection in the modulation, which allows transitions from flat to non-flat strips for dynamic light control.

Динамичният пръстен резонатор предлага нова възможност в измерението на синтетичната честота

(a) – (b) Measured reading of a band structure with time allowed from the output port of the excited ring, showing projections of the band intensity on superpositions of different resonant modes. (c) Experimentally resolved resonant mode spectra as a function of frequency detuning; and (d) the corresponding mode distributions of two selected input frequencies located in the flat and dispersion bands, respectively. (e) – (f) Observations of transitions from flat to non-flat strip achieved by adding long-distance connectivity. credit: Advanced photonics (2022). DOI: 10.1117 / 1.AP.4.3.036002

In addition, by selectively selecting the input and output ports for excitation and transmission measurements, they were able to observe different models of the band structure. Such results differ remarkably from previous work on the physics of flat bands. They reveal that signals in the system can carry optical information from superposition modes in synthetic frequency dimensions.

This demonstration of exotic light manipulation can enable basic applications of optical communications in fiber-based or chip-built resonators. The work is also potentially a important stage: Construction of the little one lattice in two connected rings of different lengths proves the feasibility of connecting multiple rings of different types to construct complex lattices outside the linear or square geometry in synthetic space. The authors predict that their results may pave the way for future experimental realization of previous theoretical proposals.

Experimental demonstration of topological scattering in photon resonators

More info:
Guangzhen Li et al, Observation of flat and band transitions in synthetic space, Advanced photonics (2022). DOI: 10.1117 / 1.AP.4.3.036002

Quote: The dynamic resonator ring offers a new opportunity in the synthetic frequency dimension (2022, June 21), retrieved on June 21, 2022 from -frequency.html

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