  In this paper we propose a dark-state-based trapping strategy to break the
optical diffraction limit for microscopy. We utilize a spatially dependent
coupling field and a probe laser field with temporal and spatial modulation to
interact with three-level atoms. The temporal modulation allows us to reduce
the full width at half maximum (FWHM) of point spread function, and the spatial
modulation help us obtain better spatial resolution than Gaussian beam. In
addition, we also propose a proof-of-principle experiment protocol and discuss
its feasibility.
