Tunable broadband antireflection structures for silicon at terahertz frequency

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

doi:10.1063/1.3075059

Tunable broadband antireflection structures for silicon at terahertz frequency

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

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English (US)
Article number	041106
Journal	Applied Physics Letters
Volume	94
Issue number	4
DOIs	https://doi.org/10.1063/1.3075059
State	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3075059

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title = "Tunable broadband antireflection structures for silicon at terahertz frequency",

abstract = "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.",

author = "Chen, {Y. W.} and Han, {P. Y.} and Zhang, {X. C.}",

note = "Funding Information: The authors would like to thank Bryant Colwill, Kent Way, Nicholas Karpowicz and Jingle Liu for valuable discussion. Y.W.C. is funded by the National Science Foundation IGERT Program under Grant No. 0333314. This work is supported by the Army Research Office under Grant No. W911NF-07-1-0278.",

year = "2009",

doi = "10.1063/1.3075059",

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N1 - Funding Information: The authors would like to thank Bryant Colwill, Kent Way, Nicholas Karpowicz and Jingle Liu for valuable discussion. Y.W.C. is funded by the National Science Foundation IGERT Program under Grant No. 0333314. This work is supported by the Army Research Office under Grant No. W911NF-07-1-0278.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

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Tunable broadband antireflection structures for silicon at terahertz frequency

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