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Article title PHOTO-ORIENTATION OF AZO-DYES IN A GLASSY POLYMER WITH OPTICAL ELECTRO-POLING
Authors S.S. Kharintsev, A.M. Alekseev, K.L. Nefedieva, A.I. Fishman, E.A. Filippova
Section SECTION II. FUNDAMENTAL PROBLEMS OF NANOTECHNOLOGY
Month, Year 09, 2015 @en
Index UDC 535.012.2
DOI
Abstract In this work we investigate photoinduced optical anisotropy of nonlinear optical azo chromophores, covalently attached to the polymer backbone of the two epoxy-based oligomers containing hydroxyl groups (CFAO), with high-resolution plasmonic microscopy. This method is based on controlling near-field polarization with a plasmonic (metallic) nanoantenna. This problem can be solved either with orientating the nanoantenna in respect to a laser beam or with dc electrical field supplied between a tip apex and sample under study. In the first case the nanoantenna is orientated in respect to a sample of interest, whereas in the second case a non-linear optical chromophore with a dipole moment, orientated relatively the nanoantenna axis. Depending on a polarization direction of incident beam (linear, radial, azimuthal, vortex etc.), the dipole resonance of the antenna can be selectively tuned and used for probing orientation of chromophores. Photo-induced orientation of chromophores is studied with Kelvin probe method. An adaptive electrochemical etching method for high reproducible fabricating gold nanoantennas with self-tuned duty cycle of squared voltage. This approach allows one to perform electrochemical design for smooth and rough gold conical nanoantennas. It is shown in this work that giant Raman scattering in CFAO film can be observed due to axial nature of absorption and polarization tensors. The use of the bias voltage plasmonic nanoantenna leads to both changes in refractive index (dichroism) and reversible surface deformation. The studied photoreactive films are used in optical frequency conversion, electro-optical switches and near-field optical information storage.

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Keywords Photo-orientation; optical antenna; near-field; dye; optical anisotropy; tip-enhanced spectroscopy and microscopy
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