Abstract-Liquid crystal depolarizer based on photoalignment technology

Bing-Yan Wei, Peng Chen, Shi-Jun Ge, Li-Chao Zhang, Wei Hu, and Yan-Qing Lu

https://www.osapublishing.org/prj/abstract.cfm?uri=prj-4-2-70

We propose a depolarizer based on the principle of a collection of half-wave plates with randomly distributed optic axes. The design is demonstrated by means of dynamically photopatterning liquid crystal into randomly aligned homogeneous domains. We characterize the liquid crystal depolarizer for 1550 nm and C-band (1520–1610 nm). A degree of polarization of less than 5% is obtained for any linearly polarized light. This study provides a practical candidate for high-performance depolarizers.

© 2016 Chinese Laser Press

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Abstract-Strong Terahertz-Field Effect on Electron-Hole System in Quantum Wells

Koichiro Tanaka

https://www.osapublishing.org/abstract.cfm?URI=ls-2015-LM3H.2

We present strong terahertz light can modulate electron-hole pair creations in 2D-semiconductors. By means of THz pump and optical probe spectroscopy, we observed a strong spectral modulation of the 1s heavy-hole exciton peak of GaAs quantum wells due to Rabi splitting below 10 kV/cm. We also confirmed Franz-Keldysh type spectral modulation and its novel time-dependence in the higher field as high as 50 kV/cm.

© 2015 OSA

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