Analysis of Change in Optical Transmission Spectra Resulting from Ag Photodoping in Chalcogenide Film

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Abstract
Photodoping in a thin sample of Ag–Ge30S70 was studied by an optical transmission measurement. Changes in the optical transmission spectra were analyzed on the bases of a uniform distribution of dissolved Ag. This study suggests that the spectra of thin samples are not modulated by the interference effect over a wavelength range of 350–800 nm. The amount of photodoped Ag is quantitatively estimated from values of ln [T(t)/T(0)], where T(t) is the transmission after exposure to light for time t. There is a specific wavelength at which the transmission is practically independent of the irradiation time; traces of the spectra reach a point at this wavelength. This point is called an isotransmission point and is denoted λ*. The condition that λ* appears in the spectra was derived theoretically. The isotransmission point is useful for estimating the thicknesses of an Ag-doped layer.

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