Engineering Purcell factor anisotropy for dark and bright excitons in two dimensional semiconductors

Abstract Tightly bound dark excitons in atomically thin semiconductors can be used for various optoelectronic applications including light storage and quantum communication. Their optical accessibility is however limited due to their out-of-plane transition dipole moment. We thus propose strengthen the coupling of two dimensional materials with resonant modes a cavity at room temperature, by engineering anisotropy Purcell factor. A silica micro-disk characterised high confinement small modal volume, Q -factor free spectral range couple monolayer metal dichalcogenides (TMDCs). show numerically that tapering sidewalls an extremely versatile route achieving selective whispering gallery emitted from dipoles detriment in-plane ones four representative TMDCs.