Absorption and Resonance in Dyes

Amelia G. VanEngen Spivey

Steve Hughes, G. Spruce, Brian S. Wherrett +2 more

Vittorio Degiorgio, G. Potenza

Ján Sojka, Ján Papánek

Ali K. Jahromi, Lorelle N. Pye, Soroush Shabahang +3 more

By judiciously devising mirror reflectivities of a cavity containing an absorber, we experimentally demonstrate coherent perfect absorption in a resonant organic dye, even though the material’s intrinsic absorption significantly varies across the dye absorption bandwidth.

Shuwu Xu, Yunxia Huang, Yunhua Yao +4 more

Abstract We theoretically and experimentally demonstrate the control of the intermediate state absorption in an ( n + m ) resonance-mediated multi-photon absorption process by the polarization-modulated femtosecond laser pulse. An analytical solution of the intermediate state absorption in a resonance-mediated multi-photon absorption process is obtained based on the time-dependent perturbation theory. Our theoretical results show that the control efficiency of the intermediate state absorption by the polarization modulation is independent of the laser intensity when the transition from the intermediate state to the final state is coupled by the single-photon absorption, but will be affected by the laser intensity when this transition is coupled by the non-resonant multi-photon absorption. These theoretical results are experimentally confirmed via a two-photon fluorescence control in (2 + 1) resonance-mediated three-photon absorption of Coumarin 480 dye and a single-photon fluorescence control in (1 + 2) resonance-mediated three-photon absorption of IR 125 dye.