Thienylene polyazomethines and polyazines as third-order nonlinear optical materials

Silvia Destri; Mariacecilia Pasini; William Porzio; Andrea Zappettini; Franco D'Amore

doi:10.1364/JOSAB.24.001505

Journal of the Optical Society of America B
Vol. 24,
Issue 7,
pp. 1505-1511
(2007)
•https://doi.org/10.1364/JOSAB.24.001505

Thienylene polyazomethines and polyazines as third-order nonlinear optical materials

Silvia Destri, Mariacecilia Pasini, William Porzio, Andrea Zappettini, and Franco D’Amore

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Silvia Destri, Mariacecilia Pasini, William Porzio, Andrea Zappettini, and Franco D'Amore, "Thienylene polyazomethines and polyazines as third-order nonlinear optical materials," J. Opt. Soc. Am. B 24, 1505-1511 (2007)

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Abstract

Linear and third-order nonlinear optical (NLO) phenomena have been studied in three thiophene-containing polyimine classes. A complete characterization has been performed determining the real part of the refractive index n, its imaginary part k, and the third-order NLO value $χ^{(3)}$ . The NLO values derived for the polymers are related to both the electronic property and backbone conformational arrangement, affecting the overall conjugation. The highest third-order NLO coefficient has been measured on a very homogeneous spin-coated film of dialkyl substituted polyazine, showing a value of $5.2 \times 10^{- 11} esu$ at $1710 nm$ , where the material is essentially transparent.

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Samples	$M_{w}$	$M_{w} ∕ M_{n}$	$λ_{\max}$ (nm)	$χ^{(3)}$ (esu)	n $(1.55 μ m)$
PAM1A	43,495	2.7	430	$< 10^{- 12}$	1.61
PAM2A	36,493	3.3	425	$< 10^{- 12}$	1.54
PAM1B	26,800	2.5	475	$2.4 \times 10^{- 11}$	1.70
PAM2B	32,700	1.7	480	$3.6 \times 10^{- 11}$	1.65
PAZ1	32,400	3.3	500 (545)	$2.3 \times 10^{- 11}$	1.90
PAZ2	27,500	1.8	530 (575)	$5.4 \times 10^{- 11}$	1.63

Solvent	Mp $(g {mol}^{- 1})$	Unit Number	$M_{w} ∕ M_{n}$	Thickness (nm)	$χ_{1710}^{(3)} \times 10^{- 11}$ (esu)
ETOH
Hexane	21,407	45	1.86	25	5.2
THF	20,262	43	1.77	36	4.7
${CHCl}_{3}$ ^a	119,191	253	1.41	40	4.6
	130,270	276	1.37	^b

	$I 0$ (mW)	$I R$ (mW)	$I t$ (mW)	α $({cm}^{- 1})$
${CS}_{2} + PDDT$ solution	0.60	0.021	0.532	0.0018
${CS}_{2}$	0.60	0.021	0.556	0.00017
PDDT				0.24

Samples	$M_{w}$	$M_{w} ∕ M_{n}$	$λ_{\max}$ (nm)	$χ^{(3)}$ (esu)	n $(1.55 μ m)$
PAM1A	43,495	2.7	430	$< 10^{- 12}$	1.61
PAM2A	36,493	3.3	425	$< 10^{- 12}$	1.54
PAM1B	26,800	2.5	475	$2.4 \times 10^{- 11}$	1.70
PAM2B	32,700	1.7	480	$3.6 \times 10^{- 11}$	1.65
PAZ1	32,400	3.3	500 (545)	$2.3 \times 10^{- 11}$	1.90
PAZ2	27,500	1.8	530 (575)	$5.4 \times 10^{- 11}$	1.63

Solvent	Mp $(g {mol}^{- 1})$	Unit Number	$M_{w} ∕ M_{n}$	Thickness (nm)	$χ_{1710}^{(3)} \times 10^{- 11}$ (esu)
ETOH
Hexane	21,407	45	1.86	25	5.2
THF	20,262	43	1.77	36	4.7
${CHCl}_{3}$ ^a	119,191	253	1.41	40	4.6
	130,270	276	1.37	^b

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Equations (6)

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