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Structural and optical characterizations of thin organic films of thioindigo

Khusayfan N. M. and El-Nahass M. M.

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Abstract. We report on the structural and optical properties of the nanorods available in thermally evaporated thin films of thioindigo (TI). The structural features are investigated using X-ray diffraction, transmission electron microscopy and Fourier-transform infrared spectroscopy techniques. The optical constants of as-deposited thin TI films are determined in the wavelength region 200–2500 nm, using spectrophotometric measurements for the nearly normal light incidence. The type of optical transitions for the TI films is ascertained from the dispersion of their absorption coefficient. The real part of the refractive index in the region of optical transparency is analyzed basing on single-oscillator and Drude models. The third-order nonlinear susceptibility is obtained from the single-oscillator model and the Miller’s rule.

Keywords: organic compound, thin films, thermal evaporation, structural and optical properties

PACS: 78.40.Pg, 78.30.Ly, 78.20.Ci 
UDC: 535.39
Ukr. J. Phys. Opt. 17 10-20
doi: 10.3116/16091833/17/1/10/2016
Received: 09.11.2015

Анотація. В цій роботі представлені результати досліджень структурних і оптичних властивостей нано-стержнів присутніх в тонких плівках тіоіндиго (ТІ) виготовлених термічним випаровуванням. Структурні характеристики досліджені з використанням X-променевої дифракції, трансмісійної електронної спектроскопії і інфрачервоної Фур’є спектроскопії. Визначені оптичні константи нанесених плівок ТІ в області довжин хвиль 200–2500 нм за допомогою спектрофотометричних вимірювань при майже нормальному падінні випромінювання. Встановлено тип оптичних переходів на основі дисперсії коефіцієнта поглинання. Проаналізована дисперсія дійсної частини показника заломлення в області прозорості на основі одно-осциляторної моделі Друде. Коефіцієнт кубічної нелінійної сприйнятливості отримано на основі одно-осциляторної моделі і правила Міллера.
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