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Temperature-dependent transmission spectra (solid curves) of the cubic thin film deposited on quartz substrate, together with the transmission extremes envelope (dashed curves). The open squares are the theoretical calculation of the temperature-dependent transmission/absorption edges. Each spectrum with a highest transmission of has been shifted by a constant for clarity.
Temperature-dependent refractive index at several typical wavelengths, together with the linear fit in the temperature range of by the solid lines.
Dispersion of the thermo-optical coefficient in the cubic thin film. Experimental results: solid circles, theoretical excitonic effect : dotted curve, theoretical background contribution : dashed curve, and the overall theoretical results: solid curve.
The yielded band gap and Urbach broadening factor as a function of temperature from the transmission spectra in Fig. 1.
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