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Title: Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial

Abstract

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.

Authors:
;  [1];  [2]; ; ;  [3];  [2]
  1. Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)
  2. (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)
  3. KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22311003
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BEAMS; DIELECTRIC MATERIALS; DIFFRACTION; EXTRACTION; FILL FACTORS; HOLES; ISOTROPY; LOSSES; MODIFICATIONS; OPTICAL PROPERTIES; OPTICS; PHOTOCONDUCTIVITY; PULSES; REFRACTIVE INDEX; SILICON; SOLIDS; SPECTRA

Citation Formats

Park, Sang-Gil, Jeong, Ki-Hun, E-mail: kjeong@kaist.ac.kr, KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology, Lee, Kanghee, Han, Daehoon, Ahn, Jaewook, and Department of Physics, Korea Advanced Institute of Science and Technology. Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial. United States: N. p., 2014. Web. doi:10.1063/1.4894054.
Park, Sang-Gil, Jeong, Ki-Hun, E-mail: kjeong@kaist.ac.kr, KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology, Lee, Kanghee, Han, Daehoon, Ahn, Jaewook, & Department of Physics, Korea Advanced Institute of Science and Technology. Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial. United States. doi:10.1063/1.4894054.
Park, Sang-Gil, Jeong, Ki-Hun, E-mail: kjeong@kaist.ac.kr, KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology, Lee, Kanghee, Han, Daehoon, Ahn, Jaewook, and Department of Physics, Korea Advanced Institute of Science and Technology. Mon . "Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial". United States. doi:10.1063/1.4894054.
@article{osti_22311003,
title = {Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial},
author = {Park, Sang-Gil and Jeong, Ki-Hun, E-mail: kjeong@kaist.ac.kr and KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology and Lee, Kanghee and Han, Daehoon and Ahn, Jaewook and Department of Physics, Korea Advanced Institute of Science and Technology},
abstractNote = {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.},
doi = {10.1063/1.4894054},
journal = {Applied Physics Letters},
number = 9,
volume = 105,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}