Abstract The main achievements in our research on the physical phenomena of the excited-state nonlinear absorption in a molecular system and its applications in photonic technology are described. In the first part of this paper, some energy-level models and rate-equations are used to explain various mechanisms of the excited-state nonlinear absorption under differ-ent conditions, such as reverse saturable absorption caused by the triplet and/or the singlet excited-state absorption; saturable absorption due to the first and/or the second singlet excited-state absorption; and the excited-state nonlinear absorption induced by two-photon absorption. The experimental results for metal-organic and C60 materials irradiated by ps and ns laser pulses are consistent with the simulated curves of the transmittance versus flu-ences. In the second part, the applications of excited-state nonlinear absorption in photonic techniques including optical bistability, optical switching, optical limiting, optical modula-tion, optical logic and optical storage are introduced. The working principles of the photonic devices based on the excited-state nonlinear absorption are presented. The experimental characteristic curves are found in good agreement with the theoretical simulations for these devices.
Received: 01 August 1994
Accepted manuscript online:
PACS:
42.65.Pc
(Optical bistability, multistability, and switching, including local field effects)
Fund: Project supported by the National Natural Science Foundation of China.
Cite this article:
LI CHUN-FEI (李淳飞), SI JIN-HAI (司金海), YANG MIAO (杨淼), WANG YU-XIAO (王玉晓) EXCITED-STATE NONLINEAR ABSORPTION AND ITS APPLICATION IN PHOTONIC TECHNOLOGY 1995 Acta Physica Sinica (Overseas Edition) 4 569
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