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Optical Filters on the Basis of α -Ag_2Te Thin Films

机译:基于α-Ag_2Te薄膜的滤光片

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The investigation of α-Ag_2Te thin films optical properties by reflection and transmission spectra in IR-range are carried out. In absorption spectra there is an area (0.08 / 0.056 eV) of free carriers absorption with the sharp increasing of the absorption constant. The fine structure of absorption with peak at 0.09 eV and half-width 0.0075 eV connected with absorption of impurity transition by a valence band - small-sized donor is found. For the first time at room temperature in experimental reflection spectrum R (λ) of α-Ag_2Te behind a plasma minimum (1050 cm~(-1)) are detected two further minimum (760cm~(-1) and 500 cm~(-1)), stipulated by interaction of plasmons and long-wave longitudinal optical phonons. In the proper absorption region α (λ) spectrum presents the narrow sharp peak with half-width 0.03eV and steep slope to the short-wave. The indicated features of α-Ag_2Te thin films optical spectrums, allow considering this films as a perspective material for IR optical filters manufacturing.
机译:通过红外范围内的反射和透射光谱研究了α-Ag_2Te薄膜的光学性质。在吸收光谱中,随吸收常数的急剧增加,存在自由载流子吸收的面积(0.08 / 0.056 eV)。发现具有在0.09 eV处具有峰且半峰宽度在0.0075 eV处的吸收的精细结构,该吸收结构与通过价带-小施主的杂质跃迁吸收有关。在室温下,首次检测到α-Ag_2Te的实验反射光谱R(λ)落后于等离子体最小值(1050 cm〜(-1)),另外两个最小值为760cm〜(-1)和500 cm〜(- 1)),由等离激元与长波纵向光子相互作用来规定。在适当的吸收区域,α(λ)光谱呈现出窄的尖峰,半峰宽为0.03eV,并且对短波具有陡峭的斜率。 α-Ag_2Te薄膜光谱的指示特征允许将其视为红外光学滤光片制造的透视材料。

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