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Submitted on 1 Jan 1987
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NEW ORGANIC MATERIALS FOR HIGHLY EFFICIENT NONLINEAR OPTICAL SIGNAL
PROCESSING
J. Zyss
To cite this version:
J. Zyss. NEW ORGANIC MATERIALS FOR HIGHLY EFFICIENT NONLINEAR OPTI- CAL SIGNAL PROCESSING. Journal de Physique Colloques, 1987, 48 (C7), pp.C7-587-C7-587.
�10.1051/jphyscol:19877141�. �jpa-00226962�
JOURNAL DE PHYSIQUE
Colloque C7, suppl6ment au n012, Tome 48, decembre 1987
NEW ORGANIC MATERIALS FOR HIGHLY EFFICIENT NONLINEAR OPTICAL SIGNAL PROCESSING
J. ZYSS
CNET ( C N R S LA-250), 1 9 6 , Avenue Henri Ravkra, F-92220 Bagneux, France
Fiber o p t i c s communication systems, optical computing or industrial a s well a s s c i e n t i f i c l a s e r equipment include a number of nonlinear func- t i o n s which, in t u r n , require new highly nonlinear materials t o be adequa- t e l y packaged in devices. Among these functions are electrooptic mdula- t i o n , frequency mixing, parametric amp1 i f i c a t i o n and emission, and logical gating. As opposed t o quasi-resonnant nonl i neari t i e s originating from confined s t r u c t u r e s and localized s t a t e s such as in 111-V compound multi- p l e quantum wells, t h e approach followed here i s based on non-resonnant parametric nonl i n e a r i t i e s originating from the i n t e r a c t i ~ n of l i g h t with highly delocalized n-electron polarizable systems (1). The efficiency i s traded here f o r quasi instantaneous response and recovery times together with a wide-band t u n a b i l i t y from the v i s i b l e on t o the infra-red. Proto- type m l e c u l e and molecular systems wi 11 be discussed, exem 1 i fying s t r a - t e g i e s where molecular charge t r a n s f e r (optical diode-1 ike
f
moieties a r e engineered so as t o pack in centrosymmetric and possibly optimized ( 2 ) c r y s t a l 1 in e l a t t i c e s . The properties of N-(4-ni trophenyl 1-(L)-pro1 in01("NPP") (3) and N-(4-nitrophenyl ~-N-rnethylamino-acetonitrie ("NPAN") ( 4 )
will be emphasized and the parametric efficiency of these materials shown t o be two orders of ~ g n i t u d e above t h a t of Lithium Niobate. Other struc- t u r e s , such as Langmuir-Blodgett layers, organic cored f i b e r s or nonl inear l i q u i d c r y s t a l l l i n e polymers will be discussed and shown t o open the way towards m l e c u l a r waveguidi ng devices where the addi tionnal benefit of 1 i g h t confinement f u r t h e r enhances the gain.
(1) "Nonlinear Optical Properties of Organic Molecules and Crystals" Edi
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t o r s D.S. Chemla and J. Zyss (Academic Press, Orlando, 1987) ( 2 ) J . Zyss and J.L. Oudar, Phys. Rev. A 26, 2028 (1982)
( 3 ) J. Zyss, J.F. Nicoud and M. Coquillay, J. Chem. Phys. 81, 4160 (1984) ( 4 ) M. Barzoukas, 0. Josse, P. Fremaux, J . Zyss, J.F. Nicoud and J . Morley t o appear in J. Opt. Soc. Am. B 4 ( 2 ) june 1987, feature issue on "Nonli- near Optical Processes in Organic k t e r i a l s " editors G. Carter and 3.
Zyss.
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19877141
