PolarizationCoupled Polariton Pairs in a Birefringent Microcavity Yinglei
Polarization-Coupled Polariton Pairs in a Birefringent Microcavity Yinglei Wang, Tao Hu, Wei Xie*, Liaoxin Sun, Xuechu Shen, and Zhanghai Chen† State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structure (Ministry of Education), Department of Physics, Fudan University, Shanghai 200433, China Abstract: We demonstrate a strong coupling behavior between two polarization-orthogonal exciton-polaritons in a one-dimensional Zn. O microwire at low temperature. The energy splitting and the polarized coupling of these interacting polariton pairs are experimentally observed by the angleresolved photoluminescence spectroscopy technique. The evolution of polarization-coupled characteristics is investigated by changing the detuning between the two coupled polariton modes in a tapered Zn. O microwire. A steady oscillation can set up between the two different polarized polariton modes with resonant wavevectors and frequencies, which matches well with the plane wave coupling model. Experiment and Discussion a b a Figure 2 the low temperature angle–resolved photoluminescence spectral (k-space) mapping under cw 325 nm excitation. (a) TE polarized polaritons and TM polarized polaritons. Dashed curves represent theoretical fitting (without coupling term in equation (4)) for the lower polariton branches, the black dashed curves correspond to TM polarized polaritons, whereas white dashed curves correspond to TE polarized polaritons. (b) TE polarized polaritons and TM polarized polaritons. Dashed curves: Theoretical fitting (with coupling term in equation (4)) for the lower polariton branches, blue dashed curves represent TM polarized polaritons and the green dashed curves TE polarized polaritons. Figure 1 (a) the scanning electron microscope image of a single Zn. O microwire. c: the crystallographic axis. (b) Magnification image of the partial polarization detail. a b b a b Figure 3 (a) TE omponent between the low and up branch of the coupled polaritons. (b) TM omponent between the up and low branch of the coupled polaritons Conclusion Figure 4 (a) TE polarized polariton detected from different position of the Zn. O microwire. (b). TM polarized polariton detected from different position of the Zn. O microwire. In summary, we have reported the experimental observation of the coupling between TE polarized polaritons and TM polarized polaritons in a one-dimensional Zn. O whispering gallery microcavity at low temperature. Thanks to the multiple polariton modes in the 1 D semiconductor microcavity, the TE mode polaritons and TM mode polaritons can couple together as they satisfy the spatial and temporal superposition. The experimental results are well described by theoretical simulation based on the interaction between different polarized photons and different excitons. Our work is promising for developing polarization dependent optoelectronic devices aimed at manipulating the polarization of light in microscale.
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