Giant photoinduced optical bleaching at room and liquid helium temperatures in Sb/As2S3 multilayered films |
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Authors: | Ramakanta Naik KV Adarsh KS Sangunni |
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Institution: | a Department of Physics, Indian Institute of Science, Bangalore, 560012, Indiab Department of Physics, Indian Institute of Science Education and Research, Bhopal, 460023, India |
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Abstract: | We report the observation of giant photo induced optical bleaching in Sb/As2S3 multilayered film at room and liquid He temperatures, when irradiated with 532 nm laser at moderate intensities. The experimental results show a dramatic increase in transmittance near the band gap regime at both the temperatures; however the rates at which transmission change occurs are rather slow at low temperature. The huge change in transmission is due to the photo induced intermixing of As2S3 layer with Sb. Our XPS measurements show that photo induced intermixing occurs through the wrong homopolar bonds, which under actinic light illumination are converted into energetically favored hetropolar bonds. |
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Keywords: | Multilayered thin films Optical properties FTIR XPS |
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