Linear and circular dichroism in porphyrin J-aggregates probed by polarization modulated scanning near-field optical microscopy

Year: 2014

Authors: Tantussi F., Fuso F., Allegrini M., Micali N., Occhiuto I.G., Scolaro L.M., Patane S.

Autors Affiliation: Dipartimento di Fisica “Enrico Fermi” and CNISM, Università di Pisa, Istituto Nazionale di Ottica INO-CNR, Sezione di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy; Istituto per i Processi Chimico-Fisici IPCF-CNR, Viale F. Stagno d\’Alcontres 37, Faro Superiore, I-98158, Messina, Italy; Dipartimento di Scienze Chimiche, Università di Messina, CIRCMSB, Viale F. Stagno d\’Alcontres 31, I-98166, Messina, Italy; Dipartimento di Fisica e Scienze della Terra, Università di Messina, Viale F. Stagno d\’Alcontres 31, I-98166, Messina, Italy

Abstract: Polarization modulated scanning near-field optical microscopy (PM-SNOM) is effective in detecting circular and linear dichroism with sub-wavelength resolution. PM-SNOM investigation of the chiroptical properties of single ribbon-like nanosized J-aggregates formed by acid induced aggregation of tris-(4-sulfonatophenyl)phenylporphyrin is reported. Linear dichroism maps give evidence of well-organized chromophores packed in linear arrays within the structure of the nanoribbons. Circular dichroism maps indicate that the molecules forming the nanoribbon have an inherently chiral structure at the local scale.

Journal/Review: NANOSCALE

Volume: 6 (18)      Pages from: 10874  to: 10878

More Information: This work was supported by PRIN 2010 (2010C4R8M8).
DOI: 10.1039/c4nr00918e

Citations: 18
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