title: Giant Rabi Splitting of Whispering Gallery Polaritons in GaN/InGaN Core-Shell Wire.
abstract: The hybrid nature of exciton polaritons opens up possibilities for developing a new concept nonlinear photonic device (e.g., polariton condensation, switching, and transistor) with great potential for controllability. Here, we proposed a novel type of polariton system resulting from strong coupling between a two-dimensional exciton and whispering gallery mode photon using a core-shell GaN/InGaN hexagonal wire. High quality, nonpolar InGaN multiple-quantum wells (MQWs) were conformally formed on a GaN core nanowire, which was spatially well matched with whispering gallery modes inside the wire. Both high longitudinal-transverse splitting of nonpolar MQWs and high spatial overlap with whispering gallery modes lead to unprecedented large Rabi splitting energy of ∼180 meV. This structure provides a robust polariton effect with a small footprint; thus, it could be utilized for a wide range of interesting applications.
authors.affiliation: Department of Physics and KAIST Institute for the NanoCentury, KAIST, Daejeon 305-701, Republic of Korea.
authors.forename: Su-Hyun
authors.initials: SH
authors.lastname: Gong
authors.affiliation: Department of Physics and KAIST Institute for the NanoCentury, KAIST, Daejeon 305-701, Republic of Korea.
authors.forename: Suk-Min
authors.initials: SM
authors.lastname: Ko
authors.affiliation: Department of Physics and KAIST Institute for the NanoCentury, KAIST, Daejeon 305-701, Republic of Korea.
authors.forename: Min-Ho
authors.initials: MH
authors.lastname: Jang
authors.affiliation: Department of Physics and KAIST Institute for the NanoCentury, KAIST, Daejeon 305-701, Republic of Korea.
authors.forename: Yong-Hoon
authors.initials: YH
authors.lastname: Cho
keywords: Exciton polariton; Rabi splitting; core−shell wire; microcavity; strong coupling; whispering gallery mode