Journal
OPTICS EXPRESS
Volume 17, Issue 22, Pages 20307-20312Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.020307
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Funding
- U.S. National Science Foundation
- National Key Basic Research Special Foundation of China [2007CB310403, 2007CB310408]
- National Natural Foundation of China [60578037]
- Tianjin Sci-Tech Support Programs [08ZCKFZC28000, 07ZCGHHZ01100]
- MOE Academic Research Fund of Singapore
- Lee Kuan Yew Fund
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We present a systematic study of a close-ring pair based freestanding metamaterial fabricated by double-layer, self-aligned photolithography. Terahertz time-domain spectroscopy transmission measurements and numerical simulations have revealed negative index of refraction in the frequency range of 0.66-0.90 THz under normal wave incidence. The observed resonance behaviors can be well explained by a theoretical circuit model. The electromagnetic properties and the figure of merit of such close-ring metamaterials are also explored in terms of geometrical parameters of the unit cell with a goal of providing optimized design for three-dimensional metamaterials and potential device applications. (C) 2009 Optical Society of America
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