Fig. 1. Schematic of tapered hollow waveguide probe for detecting photons from single emitter efficiently

Fig. 2. Collection efficiency of probe for single-emitter fluorescence as a function of position of single emitter in axial direction, when single emitter is axially (dotted line) and radially (solid line) polarized

Fig. 3. Collection efficiency and working distance as functions of geometrical dimension of probe. (a) Collection efficiency and working distance as functions of outer diameter when ratio of inner diameter to outer diameter of probe is 3∶8; (b) collection efficiency and working distance as functions of inner diameter when outer diameter is 3.0 μm

Fig. 4. Average collection efficiency and working distance of probe as functions of single emitter's wavelength