Contribution of two-photon and excited state absorption in 'axial-bonding' type hybrid porphyrin arrays under resonant electronic excitation

被引：32

作者：

Kiran, PP ^{[1
]}

Reddy, DR

Dharmadhikari, AK

Maiya, BG

Kumar, GR

Rao, DN

机构：

[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India

[2] Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India

[3] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

来源：

CHEMICAL PHYSICS LETTERS | 2006年 / 418卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2005.10.139

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Two-photon absorption (2PA) and excited state absorption (ESA) properties of 'axial-bonding' type hybrid porphyrin arrays are investigated in the picosecond regime under single-photon resonant excitation condition. A crossover from reverse saturable absorption (RSA) to saturable absorption (SA) and back to RSA is observed with the increase of excitation intensity. In the corresponding intensity ranges, third- and fifth-order phase conjugate signals from degenerate four wave mixing are observed. These observations are explained using rate equations for population densities in a three-level energy scheme. At higher intensities, 2PA is found to be dominant contributor to nonlinear absorption compared to ESA. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：442 / 447

页数：6

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