The dynamic loop resonator offers a new opportunity in the artificial frequency dimension

The dynamic loop resonator offers a new opportunity in the artificial frequency dimension

An artificial heel lattice along the light frequency axis in two paired fiber loops of different lengths. Credit: Guangzhen Li, Shanghai Jiao Tong University

Synthetic dimensions in photonics provide exciting new ways to manipulate light, study physical phenomena with exotic bonds, and explore high-dimensional physics. Dynamically modulated cyclic resonator systems, where the resonance patterns are coupled to construct a synthetic frequency dimension, can provide great flexibility in experiments and reconfigurations.

The creation of complex synthetic lattices, such as Lieb’s and honeycomb lattices in multiple loops, will lead to rich opportunities for exploring exotic objects. physical phenomena Currently only found in the theoretical field, such as equivalence time phase transition in non-hierarchical systems and higher-order topologies. Towards experimental construction of more complex multiwire networks, resulting in synthetic materials repeat Space systems in two rings of different lengths are an important step.

as stated in Advanced PhotonicsRecently, a team of researchers from Shanghai Jiao Tong University built an artificial lattice with the length of the frequency dimension. They used two mated rings of different lengths, while the larger one underwent a dynamic modification. Their study, which was the first such experimental demonstration, observed and verified the intrinsic physical properties of such lattices, especially the normal presence of a flat band (dispersion). They also note the localization of the mode near the flat band. These flat beams can also be modulated in artificial space by introducing long-range couplings into the modulation, allowing a transition from flat to non-flat bands, for dynamic light control.

يوفر مرنان الحلقة الديناميكي فرصة جديدة في بُعد التردد الاصطناعي

(a)–(b) Time-calculated band structure readouts from the drop port output of the excited loop, which display band-intensity projections on overlays of different resonance patterns. (c) Experimentally resolved resonance mode spectra as a function of frequency decoupling and (d) corresponding mode distributions for two selected input frequencies located in the flat and scattered bands, respectively. (e) – (f) Observations of flat-to-non-flat band transitions were achieved by adding long-range couplings. attributed to him: Advanced Photonics (2022). DOI: 10.1117/1.AP.4.3.036002

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

This demonstration of exotic light processing may enable fundamental applications of optical communications in fiber-based or resonators. Work is also likely to be important milestone: build heel structure Two converging rings of different lengths prove the empirical feasibility of connecting multiple rings of different types to construct complex networks beyond line or square geometry in artificial space. The authors anticipate that their findings may pave the way for future experimental investigation of previous theoretical proposals.


Experimental demonstration of topological dissipation in optical resonators


more information:
Guangzhen Li et al, Observation of flat band and band transmission in artificial space, Advanced Photonics (2022). DOI: 10.1117/1.AP.4.3.036002

the quote: Dynamic Ring Resonator Offers New Opportunity in Synthetic Frequency Dimension (2022, June 21) Retrieved June 22, 2022 from https://phys.org/news/2022-06-dynamic-resonator-opportunity-synthetic-frequency.html

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