Tunable broadband antireflection structures for silicon at terahertz frequency

Y. W. Chen, P. Y. Han, X. C. Zhang

Research output: Contribution to journalArticlepeer-review


We report enhanced transmission of broadband terahertz electromagnetic waves in the frequency range from 0.2 to 3.15 THz using silicon with micropyramid surface structures. We observe a maximum 89% reduction in reflectivity of terahertz power when the sample with 60-μm -period micropyramids is used, compared to a planar silicon substrate. By varying the period of micropyramid structures from 110 to 30 μm, the cutoff frequency of enhanced transmission is tuned from 0.74 to 2.93 THz and the bandwidth of enhancement increases from 0.91 to 3.15 THz, respectively.

Original languageEnglish (US)
Article number041106
JournalApplied Physics Letters
Issue number4
StatePublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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