Prof. Zhaoyang Zhang
School of Electronic Science and Engineering, Xi’an Jiaotong University, China
Title: Coherent control on dynamics of light in electromagnetically induced honeycomb photonic lattices
Abstract:
Electromagnetically induced transparency (EIT) refers to the reduction of resonant absorption by quantum interference, so the medium becomes effectively transparent for the probe field under the action of a strong coherent (coupling) field on a linked transition. In the meanwhile, EIT can also greatly enhance and modulate the refractive index (both real and imaginary parts) experienced by the probe field. With the intensity of the coupling field being spatially modulated in a periodic manner, the incident probe beam experience a periodically modified refractive index (indicating the formation of a waveguide array) under the EIT condition. Owning to the immediate optical response of atomic medium to the modification on parameters operating EIT, such electromagnetically induced photonic lattices exhibit in situ reconfigurability [1,2].
Here, by taking advantages of the versatile nature of the coherently prepared multilevel atomic media, we experimentally demonstrate the novel dynamical behaviors of a laser field travelling through spatially extended 2D electromagnetically induced honeycomb photonic lattices with tunable Dirac cones established in coherently-prepared rubidium atomic vapors. The exhibited behaviors include loss difference induced localization [3], angular-dependent Klein tunneling [4], 2D photonic quasicrystal [5], ect.
Keywords: Dynamical behaviors, Reconfigurable photonic lattices, Atomic coherence
References
[1]
Z. Y. Zhang, et al. Particlelike behavior of topological defects in linear wave packets in photonic graphene, Phys. Rev. Lett. Vol. 122 (2019), p. 233905.
[2]
Z. Y. Zhang, et al. Observation of edge solitons in photonic graphene, Nat. Commun. Vol. 11 (2020), p. 1902.
[3]
Y. Feng, et al. Loss difference induced localization in a non-Hermitian honeycomb photonic lattice, Phys. Rev. Lett. Vol. 131(2023), p. 013802.
[4]
Z. Y. Zhang, et al. Angular-dependent Klein tunneling in photonic graphene, Phys. Rev. Lett. Vol. 129 (2022), p. 233901.
[5]
Z. Y. Zhang, et al. Non-Hermitian delocalization in a 2D photonic quasicrystal, arXiv:2312.09322 (2023).
Biography:
Zhaoyang Zhang is a Professor in the School of Electronic Science and Engineering, Xi’an Jiaotong University, China. He has been engaged in the research of atomic physics, quantum optics, nonlinear optics, and optical properties of photonic lattices in multi-level atomic systems. Recently, he mainly works on dynamics of light in instantaneously reconfigurable electromagnetically induced photonic lattices based on atomic coherence. He has been the Principle Investigator of National Nature Science Foundation for Excellent Young Scholars, and National Key Research & Development Project for Young Scientists, etc.