Large χ[sup (3)] of squarylium dye J aggregates measured using the Z-scan technique

Tatsuura, Satoshi; Wada, Osamu; Tian, Minquan; Furuki, Makoto; Sato, Yasuhiro; Iwasa, Izumi; Pu, Lyong Sun; Kawashima, Hitoshi
October 2001
Applied Physics Letters;10/15/2001, Vol. 79 Issue 16, p2517
Academic Journal
Third-order nonlinear optical coefficients χ[sup (3)] were measured for the J aggregates of two types of squarylium dye derivatives at resonant and near-resonant wavelengths by using the Z-scan technique. The maximum χ[sup (3)] value evaluated at one-photon resonance was 2.9×10[sup -6] e.s.u., which was greater than that of phthalocyanines by 4 orders of magnitude. χ[sup (3)] for one squarylium derivative was approximately two times as large as that of the other. This can be attributed to the difference of the number of molecules contributing to a coherent state in each J aggregate. © 2001 American Institute of Physics.


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