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An Optically Tunable THz Modulator Based on Nanostructures of Silicon Substrates by Mo, Chen; Liu, Jingbo; Wei, Dongshan; Wu, Honglei; Wen, Qiye; Ling, Dongxiong is a Engineering article available to read on EtoBox.

What is An Optically Tunable THz Modulator Based on Nanostructures of Silicon Substrates about?

Nanostructures can induce light multireflection, enabling strong light absorption and efficient photocarrier generation. In this work, silicon nanostructures, including nanocylinders, nanotips, and nanoholes, were proposed as all-optical broadband THz modulators. The modulation properties of these modulators were simulated and compared with finite element method calculations. It is interesting to note that the light reflectance values from all nanostructure were greatly suppressed, showing values of 26.22%, 21.04%, and 0.63% for nanocylinder, nanohole, and nanotip structures, respectively, at 2 THz. The calculated results show that under 808 nm illumination light, the best modulation performance is achieved in the nanotip modulator, which displays a modulation depth of 91.63% with a pumping power of 60 mW/mm^2^ at 2 THz. However, under shorter illumination wavelengths, such as 532 nm, the modulation performance for all modulators deteriorates and the best performance is found with the nanohole-based modulator rather than the nanotip-based one. To further clarify the effects of the nanostructure and wavelength on the THz modulation, a graded index layer model was established and the

Who reads An Optically Tunable THz Modulator Based on Nanostructures of Silicon Substrates?

Author

Mo, Chen; Liu, Jingbo; Wei, Dongshan; Wu, Honglei; Wen, Qiye; Ling, Dongxiong

Publisher

Molecular Diversity Preservation International; MDPI AG; Multidisciplinary Digital Publishing Institute (MDPI); Basel: Molecular Diversity Preservation International (MDPI), 2001-; Publons (ISSN 1424-8220)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)