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   Abreu, Henso ; Antel, Claire ; Ariga, Akitaka ; Ariga, Tomoko ; Bernlochner, Florian ; Boeckh, Tobias ; Boyd, Jamie ; Brenner, Lydia ; Cadoux, Franck ; Casper, David W. ; et al ( July 2022 , Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment)
2. Tracking the identities of boosted particles

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4. Ultrasound Tracking of the Acoustically Actuated Microswimmer

   https://doi.org/10.1109/TBME.2019.2902523  

   Chen, Qiyang ; Liu, Fang-Wei ; Xiao, Zunding ; Sharma, Nitin ; Cho, Sung Kwon ; Kim, Kang ( March 2019 , IEEE Transactions on Biomedical Engineering)

   Objective: The purpose of this paper is to demonstrate the ultrasound tracking strategy for the acoustically actuated bubble-based microswimmer. Methods: The ultrasound tracking performance is evaluated by comparing the tracking results with the camera tracking. A benchtop experiment is conducted to capture the motion of two types of microswimmers by synchronized ultrasound and camera systems. A laboratory developed tracking algorithm is utilized to estimate the trajectory for both tracking methods. Results: The trajectory reconstructed from ultrasound tracking method compares well with the conventional camera tracking, exhibiting a high accuracy and robustness for three different types of moving trajectories. Conclusion: Ultrasound tracking is an accurate and reliable approach to track the motion of the acoustically actuated microswimmers. Significance: Ultrasound imaging is a promising candidate for noninvasively tracking the motion of microswimmers inside body in biomedical applications and may further promote the real-time control strategy for the microswimmers. 

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5. Tracking exceptional points above the lasing threshold

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   Ji, Kaiwen ; Zhong, Qi ; Ge, Li ; Beaudoin, Gregoire ; Sagnes, Isabelle ; Raineri, Fabrice ; El-Ganainy, Ramy ; Yacomotti, Alejandro M. ( December 2023 , Nature Communications)

   Recent studies on exceptional points (EPs) in non-Hermitian optical systems have revealed unique traits, including unidirectional invisibility, chiral mode switching and laser self-termination. In systems featuring gain/loss components, EPs are commonly accessed below the lasing threshold, i.e., in the linear regime. In this work, we experimentally demonstrate that EP singularities in coupled semiconductor nanolasers can be accessed above the lasing threshold, where they become branch points of a nonlinear dynamical system. Contrary to the common belief that unavoidable cavity detuning impedes the formation of EPs, here we demonstrate that such detuning is necessary for compensating the carrier-induced frequency shift, hence restoring the EP. Furthermore, we find that the pump imbalance at lasing EPs varies with the total pump power, enabling their continuous tracking. This work uncovers the unstable nature of EPs above laser threshold in coupled semiconductor lasers, offering promising opportunities for the realization of self-pulsing nanolaser devices and frequency combs.

    

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