Nonlinear absorption in polydiacetylene waveguides

Abstract

We have observed nonlinear absorption in spin-coated poly(4,6-decadiyne-1, 10-diolbis {[(n-butoxycarbonyl)methyl]urethane}) [poly(3BCMU)] polydiacetylene channel waveguides at different wavelengths in the near-infrared. Intensity dependent absorption coefficients, α2 and α3, have been determined by measurements of the intensity dependent transmission. The implications of nonlinear absorption for all-optical device applications in this material are discussed.

Long-lived photoexcited states in polydiacetylenes with different molecular and supramolecular organization

“…Among these polymers, the polydiacetylenes ͑PDA's͒ have enjoyed a period of renaissance [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and the synthesis of novel PDA's has enlarged our knowledge on their properties, in particular, on the values of their nonlinear susceptibilities. 15,16 In the last five years we have been interested in the study of a class of attractive PDA's, the polycarbazolyldiacetylenes, 5,[17][18][19][20][21][22] in particular, of poly͓1,6-di ͑ N-carbazolyl͒-2,4-hexadiyne͔͑polyDCHD͒, 5,[19][20][21][22][23][24][25][26] which is, however, insoluble.…”

Towards nonlinear plasmonic devices based on metallic nanorods

“…The final position of the longitudinal resonance is approximately 680 nm, a red shift of about 5 nm. The direction of this shift is in accordance with the increase in the average refractive index of the surrounding upon photo‐polymerization of 3BCMU (poly‐3BCMU is birefringence with n ⊥ ≈ 1.635 and n // ≈ 1.535; Pender et al , 1995). A much larger shift would be expected for 100% polymerization for such a large increase in refractive index.…”

Synthesis and Optical Characterization of Polydiacetylenes Containing Carboxylic Acid, Carbamate, Phosphonium, and Quaternary Ammonium Functionalities

“…The product was triturated with dry diethyl ether and then filtered to give the bis-quaternary salt 1f: 1 H NMR (D2O) δ (ppm) 1.3 (t, 12H, J ) 7.2 Hz, CH3CH2N), 1.6 (m, 4H, CH2), 1.9 (m, 4H, CH2), 2.4 (t, 4H, J ) 6.7 Hz, CH2CtC), 3.0 (s, 6H, NCH3), 3.2-3.4 (m, 12H, CH3CH2N + (CH2): 13 Reaction of 1,12-Bis(diethylamino)dodeca-5,7-diyne (1d) with 1,3-Propanesultone. The bis(diethylamino) derivative 1d (2.0 g, 6.6 mmol) and 1,3-propanesultone (2.44 g, 20 mmol) were heated under reflux in tetrahydrofuran (50 cm 3 ) for 2 h. The product was cooled, and anhydrous acetone (100 cm 3 ) was added to precipitate the inner salt (1g, 3.3 g, 91%) as a pinkish white solid: mp 200 °C dec; 1 H NMR ((CD3)2SO) δ (ppm) 1.16 (t, 12H, J ) 7 Hz, CH3), 1.5, 1.7 and 1.9 (br m, ∼16H, CH2), 2.4 (∼t, 4H, J ) 6.7 Hz, CH2CtC), 3.2 (m, ∼16H, CH2N + ); MS m/z (relative intensity) (FAB) 549 (35) [M + 1] + , 428 (30), 390 (30), 372 (40), 354 (20), 307 (40). Anal.…”

“…General Procedure for the Preparation of Bis-Phosphonium Salts 1h-j: The appropriate bis(bromoalkyl) derivative 7 (6.25 mmol) and triphenylphosphine (25 mmol) were heated under reflux in acetonitrile (10 cm 3 ) for days. The product was cooled, and anhydrous diethyl ether (50 cm 3 ) was added to precipitate the salt. The solvents were evaporated under reduced pressure, and the residue was dried in vacuo for several hours.…”

“…The pioneering work of Wegner on the topochemical polymerization of conjugated diacetylenes 1 has generated wide interest in polydiacetylenes, with particular regard to third-order nonlinear optical properties. 2,3 There is also interest in chromic effects in polydiacetylenes induced by heat, 4 solvent variations, 5 and pH changes; the hypsochromic shifts observed in aqueous solutions of PDA carboxylic acids in passing from low to high pH have been investigated by Patel et al 6 and ourselves, 7 and related chromic effects have been harnessed in PDA-based liposomes for the colorimetric detection of influenza virus. 8 The origin of such PDA dichroism has been speculated upon 6,9 and probably relates to either a change of "effective chain conjugated length" 6 or, for certain PDAs, aggregation effects.…”