We demonstrate a technique that utilizes surface-plasmon resonance to intensify the fluorescence produced by multiphoton excitation. By enhancing the electric field initially generated by the excitation laser light, the presence of plasmon resonance introduces a gain 90 times higher in the experimentally observed fluorescence intensity than that produced from total internal reflection fluorescence. We also analyze the enhancement efficacy of surface-plasmon resonance as a function of the excitation wavelength.
© 1996 Optical Society of America
Hiroshi Kano and Satoshi Kawata, "Two-photon-excited fluorescence enhanced by a surface plasmon," Opt. Lett. 21, 1848-1850 (1996)