We report the experimental and numerical observation of oscillatory switching between counter-propagating light beams in Kerr ring microresonators. This effect well captured by a simple coupled dynamical system featuring only the self- and cross-phase Kerr nonlinearities. Self-switching of counterpropagating light is robust for realizing controllable, all-optical generation of waveforms, signal encoding, and chaotic cryptography. Phys. Rev. Lett. 126, 043901
We demonstrate how the Kerr nonlinearity can be a key enabler for many digital photonic circuits. It allows access to bistable states needed for all-optical memories and switches that can operate at a single laser frequency with no additional electrical power. Opt. Express 29, 2193-2203 (2021)
We demonstrate a technique for suppressing backscattered light in a whispering-gallery-mode resonator by positioning a sub-wavelength-size scatterer within its evanescent field, achieving at least 34 dB suppression compared to the intrinsic backscattering. Read more: Light Sci Appl 9, 204 (2020) or press release.
Broadband frequency combs are a key enabling technology for frequency metrology and spectroscopy. Here, we demonstrate that the spectrum of a soliton microcomb can be extended by bi-chromatic pumping resulting in two combs that synchronize their repetition rate via cross-phase modulation. Read more: Nat Commun 11, 6384 (2020)
Toby recently visited Airbus Defence and Space to perform R&D experiments on advanced space optics components. The visit was a collaboration between Airbus and the Max Planck Institute for the Science of Light through the Horizon 2020 MICROCOMB network.
Congratulations to Andreas Svela for winning a prize for his talk at the Imperial College Faculty of Natural Sciences research showcase. The showcase presentation is aimed at a broader audience, explaining the backscatter suppression work published in Light Sci Appl 9, 204 (2020). Watch the Presentation here.
Our group will be presenting our most recent research results at the FiO-LS virtual conference. All our talks are on Wednesday 16 September (CET times).
- 14:30 George Ghalanos “Splitting of Microresonator Modes with the Kerr-Nonlinearity”
- 21:00 Niall Moroney “Microresonator Logic Gates”
- 02:30 (17 Sept) Shuangyou Zhang “Spectrally Extended Microcombs with an Auxiliary Laser”
Our paper on the direct measurement of the mode splitting induced by the Kerr effect has been published in Physical Review Letters. Phys. Rev. Lett. 124, 223901
Our paper on logic gates Based on Interaction of Counterpropagating Light in Microresonators has been published in Journal of Lightwave Technology. J. Lightwave Technol. 38, 1414-1419
Our paper on the effects of self- and cross-phase modulation on the spontaneous symmetry breaking of light in ring resonators has been published in Physical Review A. Phys. Rev. A 101, 013823
Our paper on the generation of stabilized THz-waves with a soliton microcomb has been published in Optics Express. https://doi.org/10.1364/OE.27.035257
Together with Alessia Pasquazi’s group at the University of Sussex we published a paper on thermo-optical pulsing in a nested microresonator system embedded in a ring laser.
Optics Express 27, 19242-19254
Our paper on the dynamics of the interaction of counterpropagting light in microresonators has been published. This work has been done together with Gian-Luca Oppo and Lewis Hill at the University of Strathclyde.
Physical Review A, 98, 053863
We are organizing a special symposium on nonreciprocal photonics at CLEO2019 in San Jose (May 5th-10th 2019). Contributed submissions welcome! More information on the CLEO website.
Our work on microresonator-based optical isolators and circulators using the nonreciprocity of the Kerr effect has been published in Optica. https://doi.org/10.1364/OPTICA.5.000279