Time-resolved fluorescence anisotropy of surface plasmon coupled emission on metallic gratings

The unique characteristics of surface plasmon coupled emission (SPCE) made it useful for potential applications in the fields of plasmonic optics and biological sensing. However, the mechanism of SPCE is still under debate. We studied the time-resolved fluorescence anisotropy of SPCE excluding the interference of absorption-enhancement effect by the time-correlated single-photon counting (TCSPC) setups. The value of anisotropy at SPCE peak kept constant at -0.45 during the whole relaxation process, which is in agreement with the calculated value. Our work presented a further step toward the understanding of SPCE.