Nonlinear optical absorption properties of porphyrins confined in Nafion membrane

Enhanced Femtosecond Nonlinearities and Multiphoton Absorptions in Discrete Bands of Porphyrins

“…With the recent advances in ultrafast lasers, the femtosecond-induced nonlinearities are of special interest for potential ultrafast nonlinear device applications. Such femtosecond-based nonlinearities reported for a variety of porphyrin complexes are either 1PA- or 2PA-induced nonlinearities of B-bands only. ,− ,− In very few reports, the IR region excitations resulted in typically 2PA-induced nonlinear absorption of Q-bands. − The typical B-band-related femtosecond (∼120 fs)-induced 2PA absorption coefficients (β) are in the range of ∼10 –8 –10 –13 cm·W –1 and the nonlinear refractive index ( n 2 ) is in the range of ∼10 –12 –10 –15 cm 2 ·W –1 , depending on the porphyrin molecular structural arrangement. It is also to be noted that the contrast of nonlinear coefficient values may also arise from the low- (<1 KHz) or high (∼MHz)-repetition femtosecond lasers, which could possibly be due to Kerr- and thermal-induced effects, respectively.…”

Optical and sensing features of TPPS4 J-aggregates embedded in Nafion® membranes: influence of casting solvents

“…22 Monomeric neutral porphyrin or cationic metallo derivatives in Nafion Ò have been already investigated in catalysis, [23][24][25][26] sensing [27][28][29][30] and optical applications. 31,32 In this latter case the polymeric matrix has been only used to preserve the porphyrin from degradation. To the best of our knowledge, apart from a report on cationic porphyrins forming simple dimers, 33 no extended porphyrins aggregates have been reported for this matrix so far.…”