期刊
APL PHOTONICS
卷 2, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4986505
关键词
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资金
- 973 Program of China [2013CBA01702]
- National Natural Science Foundation of China [11474206, 91233202, 11374216, 11174211, 11404224]
- National High Technology Research and Development Program of China [2012AA101608-6]
- Program for New Century Excellent Talents in University [NCET-12-0607]
- Scientific Research Project of Beijing Education Commission [KM201310028005]
- Beijing Youth Top-Notch Talent Training Plan [CITTCD201504080]
- Specialized Research Fund for the Doctoral Program of Higher Education [20121108120009]
- Scientific Research Base Development Program of the Beijing Municipal Commission of Education
We demonstrate an optically reconfigurable grating with enhanced transmission of TE-polarized waves in the terahertz (THz) waveband. This kind of grating is realized by projecting a grating image onto a thin Si wafer with a digital micromirror device (DMD). The enhanced transmission is caused by a resonance of the electromagnetic fields between the photoexcited strips. The position of the transmission peak shifts with the variation of the period and duty cycle of the photoinduced grating, which can be readily controlled by the DMD. Furthermore, a flattened Gaussian model was applied to describe the distribution of the photoexcited free carriers in the Si wafer, and the simulated transmittance spectra are shown to be in good agreement with the experimental results. In future, the photoexcited carriers could also be used to produce THz diffractive elements with reconfigurable functionality. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license
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