Fig. 1. Schematic of surface plasmon resonance system

Fig. 2. Energy level diagram of three-level atom medium

Fig. 3. Variation in atomic medium polarizability χ with normalized frequency detuning δp/γ of probe light

Fig. 4. Variation in reflectivity R of probe light with incident angle θp. (a) Coupling light is free propagating wave; (b) coupling light is surface plasmon wave

Fig. 5. Variation in normalized reflection shift S/λ of probe light with incident angle θp. (a) Coupling light is free propagating wave; (b) coupling light is surface plasmon wave

Fig. 6. Variations in (a) reflectivity and (b) reflective shift of probe light with δp/γ when coupling light is free propagating wave

Fig. 7. Variations in (a) reflectivity and (b) reflective shift of probe light with δp/γ when coupling light is surface plasmon wave

Fig. 8. Variation in shift response sensitivity As with δp/γ when θp=43.8°. (a) Coupling light is free propagating wave; (b) coupling light is surface plasmon wave

Fig. 9. Variation in reflection shift of probe light with δp/γ at different Rabi frequencies when θp=43.8°. (a) Coupling light is free propagating wave; (b) coupling light is surface plasmon wave