Spectral dependence of third order nonlinear optical susceptibility of zinc phthalocyanine

Abstract

Wavelength dependence of saturable absorption ͑SA͒ and reverse saturable absorption ͑RSA͒ of zinc phthalocyanine was studied using 10 Hz, 8 ns pulses from a tunable laser, in the wavelength range of 520-686 nm, which includes the rising edge of the Q band in the electronic absorption spectrum. The nonlinear response is wavelength dependent and switching from RSA to SA has been observed as the excitation wavelength changes from the low absorption window region to higher absorption regime near the Q band. The SA again changes back to RSA when we further move over to the infrared region. Values of the imaginary part of third order susceptibility are calculated for various wavelengths in this range. This study is important in identifying the spectral range over which the nonlinear material acts as RSA based optical limiter.

Synthesis, growth, structure and nonlinear optical properties of a semiorganic 2-carboxy pyridinium dihydrogen phosphate single crystal

“…The value of imaginary part of the third order susceptibility is calculated to be 1.43 Â 10 À19 m 2 /V 2 . This value is comparable to that of Phthalocyanine, Zinc phthalocyanine, and Rhodamine B [33][34][35]. In 2CPDP, the delocalized electronic cloud around the phosphate anions is the major cause for the nonlinear optical absorption.…”

Kinetic model for the molecular system of Zinc(II)-2,9,16,23-phthalocyanine tetracarboxylate

“…1,4,17 Moreover, extension of p electron conjugated system leads generally to high polarizability as well as to rapid charge redistribution upon the interaction of the molecule with fast varying intensive electromagnetic field such as that of laser pulse. 37 The insertion of metal to the centre of Pc molecule leads to a decrease in the HOMO-LUMO energy gap of the molecular system with large conjugated electronic system of 18 π delocalized electrons. This increasingly results in a strong red shift of the Q band.…”

Picosecond and nanosecond third order nonlinear optical characterization of Cu and Ni phthalocyanines using Z-scan technique

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Several groups have argued about nuances of these materials in extensive range of photonic applications. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Our comprehensive experiments and detailed modeling, along with the obtained nonlinear coefficients, strongly suggest that these molecules are potential molecules with large nonlinear coefficients in ns, ps, and fs time domains with ultrafast response times. More so, phthalocyanines and their derivatives possess attractive third-order nonlinearities and figures of merit with outstanding applications in optical limiting and ultrafast all-optical switching.…”