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LASER-MATTER INTERACTION
Optical Detection of the Glass Transition Temperature of Nanoconfined Polymers Using Plasmon Nanostructures
E. Chernykh, S. Kharintsev
Kazan Federal University, Institute of Physics, Department of Optics and Nanophotonics, 16 Kremlevskaya Street, 420008, Kazan, Russia elenorchernykh@gmail.com
In the conditions of the modern desire for miniaturization of optoelectronic and photonic devices, the element base of which includes nanosized polymeric materials, the control of their local temperature of phase transitions plays a decisive role. Until now, local detection was carried out by the additional preparation of the sample for the use of methods such as fluorescence spectroscopy [1], which is not always available in the case of polymer film sandwiches. Other existing methods need macroscopic heating of the sample, which can lead to its irreversible destruction of its geometry. As a result, new approaches and methods are require ensuring the registration of the local temperature of phase transitions, since it is handles for the stability of the polymer material, and hence the stability of the device.
We propose to detect the local glass transition temperature using light-induced heat at the nanoscale. Such heating can be generated by plasmonic nanostructures under the action of light under plasmon resonance conditions [2]. However, the increased heat generated by the nanostructure can be dissipated into the substrate with a high thermal conductivity, and as a result, the heating of the nanostructure will be negligible. The creation of enhanced heating of metal nanostructures, which will initiate the glass transition of the polymer, is possible due to the nanostructured surface of the thermostat. We demonstrate that a two-dimensional array of titanium and silicon nitride structures (TiN:Si) allows the creation of localized heating of nanosized polymers, which triggers the glass transition process. The structures are stacked parallelepipeds of titanium and silicon nitride (Figure 1), the latter varying in height. Thermometry of the Raman scattering of light and numerical simulation methods show that with an increase in the height of silicon nanostructures and rise in the temperature of titanium nitride structures is observed. We have determined the glass transition temperature of the nanoconfined polymer PMMA in the form of a thin film for the first time using a tunable plasmonic metasurface and Raman spectroscopy.
ALT'22
Fig. 1. Scheme of a TiN:Si structure for localized heating of the nanoconfined polymer.
This paper has been supported by the Kazan Federal University Strategic Academic Leadership Program (PRIOR-ITY-2030).
[1] R.R. Baglay and C.B. Roth, Communication: experimentally determined profile of local glass transition temperature across a glassy-rubbery polymer interface with a Tg difference of 80 K, The Journal of Chemical Physics, 143, pp. 111101, (2015).
[2] G. Baffou and R. Quidant, Thermo-plasmonics: using metallic nanostructures as nano-sources of heat, Laser Photonics Review, 7, pp. 171-187, (2013).
