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| Hlavní autoři: | , , , , , , |
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| Médium: | Preprint |
| Vydáno: |
2025
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| Témata: | |
| On-line přístup: | https://arxiv.org/abs/2503.22012 |
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- In this paper, the infrared dielectric function of photochromic dipyridinium thiazolo[5,4-d]thiazole embedded in polymer is reported. Bulk thiazolo[5,4-d]thiazole-embedded polymer samples were prepared by drop casting and dehydration in room temperature. The samples were investigated using spectroscopic ellipsometry before and after irradiation with a 405~nm diode laser in the infrared spectral range from 500 cm-1 to 1800 cm-1. The model dielectric functions of the thiazolothiazole embedded polymer film for its TTz2+ (unirradiated) and TTz0 (irradiated) states are composed of a series of Lorentz oscillators in the measured spectral range. A comparison of the obtained complex dielectric functions for the TTz2+ and TTz0 states shows that the oscillators located in the spectral ranges 500 cm-1 - 700 cm-1, 1300 cm-1 - 1400 cm-1, and 1500 cm-1 - 1700 cm-1 change in both amplitude and resonant frequency upon transition between the states. Additionally, a resonance at approximately 1050 cm-1 exhibited a change in oscillator amplitude but not resonant frequency due to the photochromic transition.