Optoelectronics Letters, Volume. 15, Issue 2, 135(2019)
Protonation effect on the nonlinear absorption, nonlin-ear refraction and optical limiting properties of tetra-phenylporphyrin
Nonlinear optical properties of tetraphenylporphyrin (H2TPP) and protonated tetraphenylporphyrin (H4TPP2+) in tolu-ene were investigated by Z-scan technique using a nanosecond laser with 5 ns pulse at 532 nm. Results show that H4TPP2+ exhibits weaker nonlinear refraction but enhanced reverse saturable absorption (RSA) and optical limiting performance in comparison with pristine H2TPP. Since no nonlinear scattering is observed in H4TPP2+ under low input fluence, and H4TPP2+ exhibits weaker nonlinear scattering signals than H2TPP under high input fluence, the enhance-ment of RSA and optical limiting performance can be attributed to the larger ratio of excited state absorption cross-section to that of the ground state of H4TPP2+. H4TPP2+ also exhibits superior optical limiting performance, even better than the benchmark RSA material C60.
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ZHANG Xiao-liang, CHEN Xiao-hong. Protonation effect on the nonlinear absorption, nonlin-ear refraction and optical limiting properties of tetra-phenylporphyrin[J]. Optoelectronics Letters, 2019, 15(2): 135
Received: Sep. 30, 2018
Accepted: Dec. 15, 2018
Published Online: Apr. 16, 2019
The Author Email: Xiao-liang ZHANG (zhangxiaoliang@tyut.edu.cn)