Nonlocal optical nonlinearity of ionic liquids

The nonlinear optical properties of two ionic liquids, 1-n-butyl-3-methylimidazolium tetrafluoroborate ([BMI]BF4) and 1-n-butyl-3-methylimidazolium hexafluorophosphate ([BMI]PF6), have been investigated using the Z-scan technique. These compounds are liquid at room temperature and present a strong ionic nature. Nonlinear refraction and absorption, and thermo-optical measurements for both ionic liquids were performed using two different laser wavelengths, 514 nm and 810 nm, in the continuous wave and femtosecond regimes, respectively. It was observed that those specimens have large negative nonlinear refractive indexes and thermo-optical coefficients, but nonlinear absorption was not observed. Different dispersion relations were observed depending on the ionic liquid anion, which may be related to the distinct structures of these compounds. This result indicates that ionic liquids are suitable media for the investigation of nonlocal nonlinear phenomena.

[1]  P. Kubisa.  Application of ionic liquids as solvents for polymerization processes , 2004 .

[2]  J. Dupont,et al.  Mobile Phase Effects in Rh/Sulfonated Phosphine/Molten Salts Catalysed the Biphasic Hydroformylation of Heavy Olefins , 2001 .

[3]  Ole Bang,et al.  Collapse arrest and soliton stabilization in nonlocal nonlinear media. , 2002, Physical review. E, Statistical, nonlinear, and soft matter physics.

[4]  L. Kelly,et al.  A dual fluorescence temperature sensor based on perylene/exciplex interconversion. , 2001, Journal of the American Chemical Society.

[5]  F. Smektala,et al.  Thermal and optical properties of chalcohalide glass , 2001 .

[6]  William T. Lotshaw,et al.  Femtosecond optical Kerr studies on the origin of the nonlinear responses in simple liquids , 1988 .

[7]  G. Kranzelbinder,et al.  Organic solid-state lasers , 2000 .

[8]  Giancarlo Ruocco,et al.  Shocks in nonlocal media. , 2007, Physical review letters.

[9]  J. Dupont,et al.  A Simple and Practical Method for the Preparation and Purity Determination of Halide‐Free Imidazolium Ionic Liquids , 2006 .

[10]  E. W. Stryland,et al.  Sensitive Measurement of Optical Nonlinearities Using a Single Beam Special 30th Anniversary Feature , 1990 .

[11]  David J. Williams,et al.  Introduction to Nonlinear Optical Effects in Molecules and Polymers , 1991 .

[12]  M. Antonietti,et al.  Ionic liquids for the convenient synthesis of functional nanoparticles and other inorganic nanostructures. , 2004, Angewandte Chemie.

[13]  M. Falconieri,et al.  Simultaneous measurement of pure-optical and thermo-optical nonlinearities induced by high-repetition-rate, femtosecond laser pulses: application to CS2 , 1999 .

[14]  Sandra Einloft,et al.  Synthesis and physical-chemical properties of ionic liquids based on 1-n-butyl-3-methylimidazolium cation , 1998 .

[15]  K. R. Seddon,et al.  The phase behaviour of 1-alkyl-3-methylimidazolium tetrafluoroborates; ionic liquids and ionic liquid crystals , 1999 .

[16]  Jason W. Fleischer,et al.  Dispersive, superfluid-like shock waves in nonlinear optics: Properties & interactions , 2007, 2007 Quantum Electronics and Laser Science Conference.

[17]  J. Dupont,et al.  C-H-pi interactions in 1-n-butyl-3-methylimidazolium tetraphenylborate molten salt: solid and solution structures , 2000, Chemistry.

[18]  Alan R. Kennedy,et al.  Ionic liquid crystals: hexafluorophosphate salts , 1998 .

[19]  M. Falconieri,et al.  Thermo-optical effects in Z -scan measurements using high-repetition-rate lasers , 1999 .

[20]  J. Dupont.  On the solid, liquid and solution structural organization of imidazolium ionic liquids , 2004 .

[21]  Marco Peccianti,et al.  Route to nonlocality and observation of accessible solitons. , 2003, Physical Review Letters.

[22]  Ole Bang,et al.  Tunable diffraction and self-defocusing in liquid-filled photonic crystal fibers. , 2007, Optics express.

[23]  Xingzhong Yan,et al.  Up-converted emission in a series of phenylazomethine dendrimers with a porphyrin core. , 2005, The journal of physical chemistry. B.

[24]  D. P. Caetano,et al.  Oblique interaction of spatial dark-soliton stripes in nonlocal media. , 2006, Optics letters.

[25]  M. Hanack,et al.  Nonlinear optical properties of tetrapyrazinoporphyrazinato indium chloride complexes due to excited-state absorption processes. , 2005, The journal of physical chemistry. B.

[26]  Jason W Fleischer,et al.  Dispersive shock waves with nonlocal nonlinearity. , 2007, Optics letters.

[27]  P. Suarez,et al.  Physico-chemical processes in imidazolium ionic liquids. , 2006, Physical chemistry chemical physics : PCCP.

[28]  G. Diebold,et al.  Determination of Thermal Diffusivities, Thermal Conductivities, and Sound Speeds of Room-Temperature Ionic Liquids by the Transient Grating Technique , 2006 .

[29]  K. R. Seddon,et al.  LIQUID-CRYSTALLINE IONIC LIQUIDS , 1996 .

[30]  Choong Eui Song,et al.  Enantioselective chemo- and bio-catalysis in ionic liquids. , 2004, Chemical communications.

[31]  P. Suarez,et al.  Ionic liquid (molten salt) phase organometallic catalysis. , 2002, Chemical reviews.

[32]  C. Araújo,et al.  Ultrafast dynamics of mesoionic liquid solutions studied with incoherent light , 2001 .

[33]  Thomas E. Sutto,et al.  Hydrophobic and Hydrophilic Interactions of Ionic Liquids and Polymers in Solid Polymer Gel Electrolytes , 2007 .

[34]  P. Suarez,et al.  The use of new ionic liquids in two-phase catalytic hydrogenation reaction by rhodium complexes , 1996 .

[35]  J. Dupont,et al.  Transition-metal nanoparticles in imidazolium ionic liquids: recyclable catalysts for biphasic hydrogenation reactions. , 2002, Journal of the American Chemical Society.

[36]  C Joachim,et al.  Direct determination of the energy required to operate a single molecule switch. , 2003, Physical review letters.

[37]  M. Terazima,et al.  Rise profile of the thermal lens signal: Contribution of the temperature lens and the population lens , 1994 .

[38]  Chi‐Kuang Sun,et al.  Biomolecular imaging based on far-red fluorescent protein with a high two-photon excitation action cross section. , 2006, Optics letters.