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- Title
Dirac solitons in optical microresonators.
- Authors
Wang, Heming; Lu, Yu-Kun; Wu, Lue; Oh, Dong Yoon; Shen, Boqiang; Lee, Seung Hoon; Vahala, Kerry
- Abstract
Mode-coupling-induced dispersion has been used to engineer microresonators for soliton generation at the edge of the visible band. Here, we show that the optical soliton formed in this way is analogous to optical Bragg solitons and, more generally, to the Dirac soliton in quantum field theory. This optical Dirac soliton is studied theoretically, and a closed-form solution is derived in the corresponding conservative system. Both analytical and numerical solutions show unusual properties, such as polarization twisting and asymmetrical optical spectra. The closed-form solution is also used to study the repetition rate shift in the soliton. An observation of the asymmetrical spectrum is analysed using theory. The properties of Dirac optical solitons in microresonators are important at a fundamental level and provide a road map for soliton microcomb generation in the visible band.Dirac solitons: Equation describes new properties The intriguing properties of a new type of ultrashort light pulse in microresonators are described. Called a Dirac soliton, Heming Wang and colleagues at the California Institute of Technology say that understanding the properties of Dirac solitons is important at the fundamental level and also for providing a road map for generating ultrashort soliton pulses in the visible light range. The latter is relevant for applications such as miniature optical clocks and medical imaging techniques, for example. The solitons are generated in micron-scale devices called microresonators. And the soliton properties are controlled by the microresonator shape and choice of material. Wang and his colleagues also called attention to the importance of broadband nonlinear coupling in the microresonators for generation of the new Dirac soliton, which their equations show exhibits polarization twisting and asymmetrical optical spectra.
- Publication
Light: Science & Applications, 2020, Vol 9, Issue 1, p1
- ISSN
2047-7538
- Publication type
Article
- DOI
10.1038/s41377-020-00438-w