Open AccessSingle-walled carbon nanotubes assisted THz silicon grating modulator
Author(s) -
Yang Liu,
Tianli Zhu,
Jijun Feng,
Shuai Yuan,
Xinluo Zhao,
Tengfei Wu,
Heping Zeng
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.017025
Subject(s) - materials science , grating , carbon nanotube , optics , extinction ratio , silicon , optoelectronics , terahertz radiation , transmittance , diffraction grating , nanotechnology , wavelength , physics
Single-walled carbon nanotubes (SWCNTs) are applied to realize an enhanced frequency modulation for a suspended THz silicon grating, which is fabricated by a nanosecond laser direct writing and coated with the synthetic SWCNTs/polyacrylic emulsion composite. With terahertz time domain spectroscopy system, the transmission spectra of the bare and SWCNTs coated silicon grating are measured and compared. The SWCNTs coated silicon grating can realize an improved extinction ratio and quality factor, which is due to the SWCNTs caused local field enhancement and can be explained by the theoretical simulation with finite element method. Besides the effective modulation of the grating transmittance, SWCNTs can also be integrated with other platforms and applied in future THz imaging and communication systems.