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- ItemSteering Directional Light Emission and Mode Chirality through Postshaping of Cavity Geometry(Hoboke, NJ : Wiley, 2020) Wang, Jiawei; Tang, Min; Yang, Yue-De; Yin, Yin; Chen, Yan; Saggau, Christian Niclaas; Zhu, Minshen; Yuan, Xiaobo; Karnaushenko, Dmitriy; Huang, Yong-Zhen; Ma, Libo; Schmidt, Oliver G.Dielectric optical microcavities have been explored as an excellent platform to manipulate the light flow and investigate nonāHermitian physics in open optical systems. For whispering gallery mode optical microcavities, modifying the rotational symmetry is highly desirable for intriguing phenomena such as degenerated chiral modes and directional light emission. However, for the stateāofātheāart approaches, namely deforming the cavity geometry by precision lithography or introducing local scatterers near the cavity boundary via micromanipulation, there is a lack of flexibility in fineāadjusting of chiral symmetry and farāfield emission direction. Here, precise engineering of cavity boundary using electronābeamāinduced deposition is reported based on rolledāup nanomembraneāenabled spiralāshaped microcavities. The deformation of outer boundary results in delicate tailoring of asymmetric backscattering between the outer and inner rolling edges, and hence deterministically strong mode chirality. Besides, the crescentāshaped highāindex nanocap leads to modified light tunneling channels and inflected farāfield emission angle. It is envisioned that such a localized depositionāassisted technique for adjusting the structural deformation of 3D optical microcavities will be highly useful for understanding rich insights in nonāHermitian photonics and unfolding exotic properties on lasing, sensing, and cavity quantum electrodynamics.