Year: 2024
Type: article
Abstract: Generating coherent optical frequency combs in micro-ring resonators with Kerr nonlinearity has remarkably advanced the fundamental understanding and applications of temporal dissipative solitons. However, the spectrum of such soliton combs is restricted to the conventional definition of combs as phase-locked, equidistant lines in frequency. Here, we introduce a new class of floquet topological soliton combs that emerge in two-dimensional arrays of strongly coupled resonators engineered using floquet topology. Specifically, we demonstrate incommensurate combs where the comb lines are not equidistant but remain phase-locked. These incommensurate combs are generated by self-organized, phase-locked floquet topological soliton molecules that circulate the edge of the array. We show that these floquet topological solitons are robust and they navigate around defects, allowing for agile tunability of the comb line spacing. Our results introduce a new paradigm in using floquet engineering to generate unconventional frequency combs beyond those achievable with single or weakly coupled resonators. Optical frequency combs are conventionally defined as a set of phase-locked, equally spaced spectral lines. Here, using a two-dimensional array of Floquet topological ring resonators, the authors propose novel incommensurate combs with phase-locked spectral lines that are not all equally spaced.
Source: Nature Communications
Authors: Seyed Danial Hashemi, Sunil Mittal
Institution: Northeastern University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,790
Funder: Northeastern University
OpenAlex ID: W4404123646