Regular Article

Improved optical limiting of triazine-linked mono-, bis- and tris-phthalocyanines

¹ College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qingdao 266590 Shandong, P.R. China
² College of Science, China University of Petroleum(East China), Qingdao, 266580 Shandong, P.R. China
³ College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, 266590 Shandong, P.R. China

^a e-mail: qmiao2013@yahoo.com

Received: 20 October 2018
Received in final form: 20 October 2018
Published online: 12 February 2019

Abstract

We studied the photophysical dynamics and optical limiting properties of a series of triazine-linked mono-, bis-, and tris-phthalocyanines with central metal In for 532nm-7ns laser pulses. We used Crank-Nicholson numerical method to solve two-dimensional paraxial field equation and rate equations. Phthalocyanines are simplified to a five-level model to simulate the optical dynamical processes. We found the sequential (singlet–singlet) × (triplet–triplet) two-photon absorption is the prominent optical limiting mechanism for long pulses. Our work indicates that triazine-linked mono-, bis-, and tris-phthalocyanines exhibit excellent optical limiting behaviors, and tris-phthalocyanine shows the best properties.