物理学报2001，Vol.50Issue(3)：561-565,5.
Ag-BaO薄膜在电场作用下的可见—近红外波段光学吸收特性
OPTICAL ABSORPTION OF Ag-BaO THIN FILM IN THE VISIBLE AND NEAR-INFRARED REGION WITH APPLIED ELECTRIC FIELD
摘要
Abstract
The optical absorption properties of Ag-BaO composite thin film with excess barium were measured while a vertical electric field was applied on the film surface.Total two absorption peaks were observed in the visible and near-infrared region,and only the peak that lies in the near-infrared region was dependent on the applied electric filed,i.e.,the absorption intensity was decreased with the increasing electric field.The dominant peak in the visible region is attributed to the surface plasmons resonance of Ag ultrafine particles embedded into the BaO semiconductor matrix.However,the weaker one in the near-infraed region is considered to arise from the transition of bound electrons at impurity energy level of the BaO semiconductor matrix,and such an impurity energy level is related to the negative ion vacancies caused by the excess braium in the BaO crystal.When the external surface electric field was applied,some of the impurities in the BaO Semiconductor matrix were ionized,and which further resulted in a decrease of the density of bound electrons at the impurity energy level.So that,part of the optical absorption owing to the impurity energy level was decreased with the enhanced electric field.关键词
光吸收/金属超微粒子-半导体复合薄膜/表面等离激元/杂质能级分类
数理科学引用本文复制引用
张琦锋,侯士敏,张耿民,刘惟敏,薛增泉,吴锦雷..Ag-BaO薄膜在电场作用下的可见—近红外波段光学吸收特性[J].物理学报,2001,50(3):561-565,5.基金项目
国家自然科学基金(批准号：60071017)及北京市自然科学基金((批准号：2992019)资助的课题. （批准号：60071017）
