Structuring at subwavelength scales brings out artificial media with anomalous optical features called metamaterials. All-dielectric metamaterials have high potential for practical applications over the whole electromagnetic spectrum owing to low loss and optical isotropy. Here, we report subwavelength silicon through-hole arrays as an all-dielectric gradient index metamaterial with broadband THz operation. The unit cell consists of a single subwavelength through-hole on highly resistive monocrystalline silicon. Depending on the fill-factor and period, the effective index was linearly modulated at 0.3–1.6 THz. The experimental results also demonstrate silicon gradient refractive index (Si-GRIN) lenses with parabolic index profiles through the spatial modification of a single unit cell along the radial direction. Si-GRIN lenses either focus 0.4–1.6 THz beam to the diffraction-limit or serve as a flat and thin solid immersion lens on the backside of THz photoconductive antenna for highly efficient pulse extraction. This all-dielectric gradient index metamaterial opens up opportunities for integrated THz GRIN optics.
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1 September 2014
Research Article|
September 02 2014
Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial
Sang-Gil Park;
Sang-Gil Park
1Department of Bio and Brain Engineering,
Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
2
KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
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Kanghee Lee;
Kanghee Lee
2
KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
3Department of Physics,
Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
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Daehoon Han;
Daehoon Han
2
KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
3Department of Physics,
Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
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Jaewook Ahn
;
Jaewook Ahn
2
KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
3Department of Physics,
Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
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Ki-Hun Jeong
Ki-Hun Jeong
a)
1Department of Bio and Brain Engineering,
Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
2
KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST)
, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea
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a)
Author to whom correspondence should be addressed. Electronic mail: kjeong@kaist.ac.kr
Appl. Phys. Lett. 105, 091101 (2014)
Article history
Received:
June 08 2014
Accepted:
July 08 2014
Citation
Sang-Gil Park, Kanghee Lee, Daehoon Han, Jaewook Ahn, Ki-Hun Jeong; Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial. Appl. Phys. Lett. 1 September 2014; 105 (9): 091101. https://doi.org/10.1063/1.4894054
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