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Dielectric optical microcavities have been explored as an excellent platform to manipulate the light flow and investigate non‐Hermitian 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 state‐of‐the‐art approaches,...
Dielectric microspheres have been demonstrated as an efficient tool for non‐plasmonic surface‐enhanced Raman scattering (SERS) due to the curvature‐induced local electromagnetic enhancement. By combining a metal layer onto the microsphere surface, one can study SERS which is activated by both surface plasmons and microsphere‐induced modulation of Raman emission. In this work, a new strategy of enhanced...
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