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In 2022 summer, I joined Professor Hui Deng’s research group, mentored by Dr. Chulwon Lee. We have been working on analyzing a parity-time symmetric (PT-symmetric) polaritonic model which features many interesting properties, such as higher-order exceptional points (hEP) and anisotropic exceptional points (aEP). The EPs have found to be helpful in building sensors with higher sensibility. Check out our paper PhysRevA.109.053503 for more details!
In 2024, we continued studying the system via Finite Difference Time Domain simulation, trying to determine if we can realize such a system experimentally. We first simulated a two-component PT-symmetric model consisting of coupled photonic crystal nanobeam cavities. We have successfully realized the second-order exceptional point (EP) using the coupled cavities in simulation, and based on the results from simulations we have determined the parameters needed for realizing the higher-order EP if a third component is introduced to the coupled cavities model. The next step, which is what we are working on right now, is to build towards the ternary PT-symmetric model by introducing an exciton-like component to the system.
Physics Fall Research Fair, University of Michigan, Ann Arbor, MI, November 2022. J. Miao J. Miao. "Emerging Re-entrant PT-symmetry in a non-Hermitian exciton-polariton system."
Poster_JM.pdf
The phase diagram of our PT-symmetric three-component model
The phase diagram of our PT-symmetric three-component model
Realizing the 2nd-order exceptional point via finite-difference time-domain simulation
Realizing the 2nd-order exceptional point via finite-difference time-domain simulation
The transmission spectrum of coupled photonic crystal cavity nanobeams
The transmission spectrum of coupled photonic crystal cavity nanobeams
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